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Artykuły w czasopismach na temat „Vinyle Acetate”

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Data publikacji: 6 września 2023

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1

Grenier-Loustalot, M. F., M. Audenaert, J. Boutillier i D. Lecacheux. "Etude structurale (sequence, tacticite, branchement alkyl) de copo ethylene, acrylate d'hydroxyethyle et acetate de vinyle par RMN 1H et 13C haute resolution dans les liquides". European Polymer Journal 25, nr 4 (1989): 411–18. http://dx.doi.org/10.1016/0014-3057(89)90159-6.

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Филатов, И. Е., В. В. Уварин i Д. Л. Кузнецов. "Исследование относительной реакционной способности паров алкилацетатов по отношению к компонентам плазмы импульсного разряда в воздухе". Письма в журнал технической физики 49, nr 11 (2023): 25. http://dx.doi.org/10.21883/pjtf.2023.11.55534.19540.

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A study was made of the relative reactivity of vapors of a number of acetic acid esters (alkyl acetates) with respect to plasma components of a pulsed corona discharge with a voltage of 100 kV and a duration of 40 ns. On model mixtures based on methyl-, ethyl-, propyl-, isopropyl, isobutyl-, butyl-, and vinyl acetate with a content of 250–500 ppm in air and nitrogen, the relative reactivity parameters were obtained. The reactivity of acetic acid esters increases with an increase in the hydrocarbon substituent. The high reactivity of vinyl acetate is due to the double bond reaction with ozone.

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3

Jung, Bo Kyoung, Geon Wook Park, Jae-Keun Yu, Hyo Jun Kim, Dong Gun Kim, Minguen Kim i Kyu Hyun. "Study of Compression Set of Ethylene Vinyl Acetate (EVA) Foams". Polymer Korea 44, nr 3 (31.05.2020): 264–69. http://dx.doi.org/10.7317/pk.2020.44.3.264.

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4

González, Cristina, Jose Ma Resa, Juan Lanz i Jose A. Mtz de Ilarduya. "Excess molar volumes of binary mixtures containing vinyl acetate + alkyl acetates at 298.15 K. Anomalous behavior of methyl acetate + vinyl acetate mixtures". Fluid Phase Equilibria 137, nr 1-2 (listopad 1997): 141–48. http://dx.doi.org/10.1016/s0378-3812(97)00083-6.

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5

Bui, Nhi Dinh, Ngo Dinh Vu, Thao Thi Minh, Huong Thi Thanh Dam, Regina Romanovna Spiridonova i Semenovich Alexandr Sirotkin. "Effect of Acetate Group Content in Ethylene-Vinyl Acetate Copolymer on Properties of Composite Based on Low Density Polyethylene and Polyamide-6". International Journal of Polymer Science 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3149815.

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The effect of the content of vinyl acetate groups in ethylene-vinyl acetate copolymer on the properties of polymer composite based on low density polyethylene and polyamide-6 was studied. Ethylene-vinyl acetate copolymer containing less vinyl acetate groups (10–14 wt.%) has a positive compatibility effect on polymer composite than ethylene-vinyl acetate copolymer containing 21–30 wt.% vinyl acetate groups. The polymer composites of LDPE, PA-6, and EVA containing 10–14 wt.% vinyl acetate groups possess the ability of biodegradation. The physical-mechanical properties of sample and molecular mass reduce after 28 days of incubation.

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6

O'Neill, Mark L., Deborah Newman, Eric J. Beckman i Steve P. Wilkinson. "Solvent-free generation of poly(vinyl acetals) directly from poly(vinyl acetate)". Polymer Engineering & Science 39, nr 5 (maj 1999): 862–71. http://dx.doi.org/10.1002/pen.11475.

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7

Myshak, Volodymyr, Vita Seminog, Volodymyr Grishchenko i Antonina Barantsova. "Modified composites based on poly(ethylene-vinyl acetate) and crumb rubber". Chemistry & Chemical Technology 11, nr 4 (20.12.2017): 454–58. http://dx.doi.org/10.23939/chcht11.04.454.

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8

He, Chen, Qin Gao, Changwen Ye, Guotao Yang, Pengfei Zhang, Rongchao Yang, Qing Zhang i Kang Ma. "Development of a Purity Certified Reference Material for Vinyl Acetate". Molecules 28, nr 17 (25.08.2023): 6245. http://dx.doi.org/10.3390/molecules28176245.

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Vinyl acetate is a restricted substance in food products. The quantification of the organic impurities in vinyl acetate is a major problem due to its activity, instability, and volatility. In this paper, while using the mass balance method to determine the purity of vinyl acetate, an improved method was established for the determination of the content of three impurities in vinyl acetate reference material, and the GC-FID peak area normalization for vinyl acetate was calibrated. The three trace organic impurities were identified by gas chromatography tandem high-resolution mass spectrometry to be methyl acetate, ethyl acetate, and vinyl propionate. The content and relative correction factors for the three organic impurities were measured. The purity of vinyl acetate determined by the mass balance method was 99.90% with an expanded uncertainty of 0.30%, and the total content of organic impurities was 0.08% with a relative correction factor of 1.23%. The vinyl acetate reference material has been approved as a national certified reference material in China as GBW (E) 062710.

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9

Bolt, Hermann. "Vinyl acetate". Toxicology 226, nr 1 (wrzesień 2006): 19. http://dx.doi.org/10.1016/j.tox.2006.05.030.

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10

Luttrell, William E. "Vinyl acetate". Journal of Chemical Health and Safety 20, nr 6 (listopad 2013): 35–37. http://dx.doi.org/10.1016/j.jchas.2013.10.007.

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11

Keay, B. A., i R. Rodrigo. "The Diels–Alder reaction of 4-methoxy-7-hydroxyisobenzofuran with methyl vinyl ketone; a general method for identification of some regioisomeric α-naphthols". Canadian Journal of Chemistry 63, nr 3 (1.03.1985): 735–38. http://dx.doi.org/10.1139/v85-121.

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Two regioisomeric α-naphthols 14 and 15 obtained by aromatization of the methyl vinyl ketone adducts of an unsymmetrical isobenzofuran 9 are differentiated from each other by the observation of significant upfield shifts of the peri proton resonances in the 1H nmr spectra of their acetates 16 and 17. Such upfield shifts of 0.3–0.6 ppm appear to be a general phenomenon and are probably due to the anisotropic effect of the acetate carbonyl group.

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12

Weng, Tsai-Lung. "Evaluation of cementitious repair mortars modified with polymers". Advances in Mechanical Engineering 9, nr 1 (styczeń 2017): 168781401668858. http://dx.doi.org/10.1177/1687814016688584.

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The aim of this study was to evaluate the effects of added polymers on the properties of repair mortars. Two types of polymers, ethylene vinyl acetate and polyvinyl acetate–vinyl carboxylate, were used as a replacement for 3%, 5%, and 8% of the cement (by weight). All tests were conducted using two water–cement ratios of 0.5 and 0.6. The effectiveness of the repair materials was evaluated according to setting time, drying shrinkage, thermal expansion, compressive strength, and bond strength. Specimens containing polyvinyl acetate–vinyl carboxylate at a water–cement ratio of 0.5 presented the highest compressive and bond strength. Specimens containing ethylene vinyl acetate presented strength characteristics exceeding those of the control at 28 days. The drying shrinkage of polyvinyl acetate–vinyl carboxylate specimens was similar to that of the control. At a water–cement ratio of 0.5, the thermal expansion of polyvinyl acetate–vinyl carboxylate specimens was lower than that of ethylene vinyl acetate specimens; however, at a water–cement ratio of 0.6, the thermal expansion was independent of the type of polymer.

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13

Resa, J. M., C. González, B. Moradillo i J. Lanz. "(Vapour + liquid) equilibria for (methanol + butyl acetate), (vinyl acetate + butyl acetate), (methanol + isobutyl acetate), and (vinyl acetate + isobutyl acetate)". Journal of Chemical Thermodynamics 30, nr 10 (październik 1998): 1207–19. http://dx.doi.org/10.1006/jcht.1998.0385.

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14

Markley, Thomas J., Robert K. Pinschmidt i John W. Vanderhoff. "Grafting reactions of vinyl acetate onto poly[(vinyl alcohol)-co-(vinyl acetate)]". Journal of Polymer Science Part A: Polymer Chemistry 34, nr 13 (30.09.1996): 2581–94. http://dx.doi.org/10.1002/(sici)1099-0518(19960930)34:13<2581::aid-pola4>3.0.co;2-v.

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15

Zhang, Qiuli, Zhaoyang Chen, Ziyue Song, Jun Zhou, Xiaogang Ning i Lei Wu. "Simulation and improvement of the separation process of synthesizing vinyl acetate by acetylene gas-phase method". Green Processing and Synthesis 10, nr 1 (1.01.2021): 912–22. http://dx.doi.org/10.1515/gps-2021-0078.

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Abstract Vinyl acetate, as an essential organic chemical raw material, can be used to produce polyvinyl acetate, polyester vinyl alcohol, and other products. The existing classical vinyl acetate production process has the problems of low product purity and excessive heat load. In this study, in the classical design of the process, acetylene is separated first, and then acetaldehyde is removed with the formation of an azeotrope between ethylene acetate and water. Meanwhile, considering the solubility of acetaldehyde in water and insolubility of vinyl acetate in water, the process was optimized to separate acetic acid after removing acetylene, so as to avoid the azeotrope formation of vinyl acetate and water. The nonrandom two-liquid-Hayden–O’Connell thermodynamic hybrid model was used to simulate the classical process and improved process (IP). Finally, the reflux ratio and theoretical tray number of the main separation equipment of IP were optimized to get the better parameters. The simulated results show that the purity of vinyl acetate increased from 99.1% to 99.8%, the cooling energy consumption was reduced by 16.83%, and the thermal energy consumption was reduced by 6.18%. At the same time, the equipment investment was also decreased.

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16

Xu, Hang, Tianlong Yu i Mei Li. "Zinc Acetate Immobilized on Mesoporous Materials by Acetate Ionic Liquids as Catalysts for Vinyl Acetate Synthesis". Journal of Chemistry 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/238287.

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Ionic liquid containing active ingredient Zn(CH3COO)2was loaded in mesoporous silica gel to form supported ionic liquids catalyst (SILC) which was used to synthesize vinyl acetate monomer (VAM). SILC was characterized by1HNMR, FT-IR, TGA, BET, and N2adsorption/desorption and the acetylene method was used to evaluate SILC catalytic activity and stability in fixed reactor. The result shows that 1-allyl-3-acetic ether imidazole acetate ionic liquid is successfully fixed within mesoporous channel of silica gel. The average thickness of ionic liquid catalyst layer is about 1.05 nm. When the catalytic temperature is 195°C, the acetic acid (HAc) conversion is 10.9% with 1.1 g vinyl acetate yield and 98% vinyl acetate (VAc) selectivity. The HAc conversion is increased by rise of catalytic temperature and molar ratio of C2H2 : HAc and decreased by mass space velocity (WHSV). The catalyst activity is not significantly reduced within 7 days and VAc selectivity has a slight decrease.

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17

Chang, Ai Rong. "Preparation and Study of Polyvinyl Alcohol Fiber". Applied Mechanics and Materials 727-728 (styczeń 2015): 227–30. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.227.

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The preparation of polyvinyl alcohol fibers mainly consists of three steps: 1. The polymerization of vinyl acetate. Need the preparation of vinyl acetate and polymerization of vinyl acetate. The polymerization of vinyl acetate uses acetylene method and ethylene method.2. Preparation of PVA. Mainly to let the polyvinyl acetate taking alcoholysis reaction to the effect of methanol or sodium hydroxide. 3. Preparation of polyvinyl alcohol fiber. Complete dope preparation through washing and dehydration, dissolving, mixing, filtering and deaeration, and uses the dry, wet two methods to form the spinning. Finally, through the follow-up processing, to accomplish the preparation of polyvinyl alcohol fiber. Water soluble and high concentration polyvinyl alcohol fiber ‘s performances are fine and is application widely.

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18

Wang, Ju Wei. "Fiberboard with PVC Coated Plastic Research". Advanced Materials Research 803 (wrzesień 2013): 205–8. http://dx.doi.org/10.4028/www.scientific.net/amr.803.205.

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PVC film facing material has the real wood grain feeling, high wear resistance strength, soft gloss and widely used in wooden furniture surface decoration [. But PVC film and plank have low degree of adhesive; water will open in bubble shortcomings. And butyl acrylic, vinyl acetate copolymer emulsion and have good adhesive sex and peel strength, and it has better cohesion[.This article describes the modified acrylic adhesive vinyl acetate synthesis methods and performance characteristics that affect the performance of some of the major factors, namely raw material ratio, the amount of initiator, polymerization temperature, add water, put forward various factors on product performance cause and effect, and how to improve product performance were discussed. Analysis of the response characteristics of acrylic ester, acrylic acid ester described the main components of raw materials and application of several adhesive, tells today of Propylene. Ester adhesive research trends and research progress. In addition to the acryl ate modified vinyl acetate adhesive preparation and distribution of each group than to its solid content, initial viscosity, viscosity can be held, 180-degree peel strength of the main physical properties[. With the change in the distribution ratio of each group, the physical properties of its corresponding change took place, after joining EHA modified acrylic adhesive vinyl acetate also increased the initial viscosity. With the change in component modified vinyl acetate acrylic adhesive solid content and viscosity are held to change[.Idea vinyl acetate adhesive properties of the impact of factors related to the quality of acrylic acid, the ratio of butyl acryl ate and ethyl acetate, PVA's quality[. The results show that when the initiator was ammonium per sulfate (APS), the acrylic acid quality is 4, the ratio of butyl acryl ate and ethyl acetate 30:70, PVA modified by a mass of 8 180 vinyl adhesive peel strength largest, best quality plastic. Preparation of rubber modified vinyl acetate preferably 180 ° peel strength, holding the maximum viscosity, the measured test results of the best.Key words: Acryl ate; acryl ate modified vinyl acetate adhesives; holding viscous energy; 180 ° peel strength;

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19

Ishijima, Takeshi, Yoshiki Mizumori, Kenji Kikuchi, Atsushi Suzuki i Takuji Okaya. "Polymerization of vinyl acetate in fatty acids and properties of poly (vinyl alcohols) derived from the poly (vinyl acetates)". Colloid and Polymer Science 283, nr 7 (19.02.2005): 799–804. http://dx.doi.org/10.1007/s00396-004-1239-4.

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20

Kim, Seon Yong. "Experimental study on the effects of EVA(Ethylene Vinyl Acetate) for solar cell's long-term life". Journal of the Korea Safety Management and Science 17, nr 4 (31.12.2015): 397–401. http://dx.doi.org/10.12812/ksms.2015.17.4.397.

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21

Song, Zezhuo, Jin Liu, Yuxia Bai, Jihong Wei, Ding Li, Qiongya Wang, Zhihao Chen, Debi Prasanna Kanungo i Wei Qian. "Laboratory and Field Experiments on the Effect of Vinyl Acetate Polymer-Reinforced Soil". Applied Sciences 9, nr 1 (8.01.2019): 208. http://dx.doi.org/10.3390/app9010208.

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Soil stabilizer can enhance the soil properties, which can improve ecological environmental problems such as soil erosion and slope instability. This study investigates the water-related and mechanical properties of soil stabilization using a polymer soil stabilizer solution synthesized from vinyl acetate polymer. The water properties test, mechanical properties test, durability test and seed growth test were carried out in the laboratory. Also, the effect of vinyl acetate polymer was verified by field tests. The results revealed that vinyl acetate polymer can enhance the water-retaining property, anti-erosion resistance, strength property and durability of soil, all of which increase with the increase of polymer concentration. At the same time, the polymer also has a certain promoting effect on vegetation growth. In addition, field tests proved that vinyl acetate polymer has good effects on soil engineering. These results could be applied as a reference for vinyl acetate polymer-improved soil engineering.

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22

Schlappa, Stephanie, Lee Josephine Brenker, Lena Bressel, Roland Hass i Marvin Münzberg. "Process Characterization of Polyvinyl Acetate Emulsions Applying Inline Photon Density Wave Spectroscopy at High Solid Contents". Polymers 13, nr 4 (23.02.2021): 669. http://dx.doi.org/10.3390/polym13040669.

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The high solids semicontinuous emulsion polymerization of polyvinyl acetate using poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated by optical spectroscopy. The suitability of Photon Density Wave (PDW) spectroscopy as inline Process Analytical Technology (PAT) for emulsion polymerization processes at high solid contents (>40% (w/w)) is studied and evaluated. Inline data on absorption and scattering in the dispersion is obtained in real-time. The radical polymerization of vinyl acetate to polyvinyl acetate using ascorbic acid and sodium persulfate as redox initiator system and poly (vinyl alcohol-co-vinyl acetate) as protective colloid is investigated. Starved–feed radical emulsion polymerization yielded particle sizes in the nanometer size regime. PDW spectroscopy is used to monitor the progress of polymerization by studying the absorption and scattering properties during the synthesis of dispersions with increasing monomer amount and correspondingly decreasing feed rate of protective colloid. Results are compared to particle sizes determined with offline dynamic light scattering (DLS) and static light scattering (SLS) during the synthesis.

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23

Waly, A., F. A. Abdel-Mohdy i A. Hebeish. "Chemical Modification of Starch-Poly (Vinyl Acetate) Materials". Engineering Plastics 6, nr 3 (styczeń 1998): 147823919800600. http://dx.doi.org/10.1177/147823919800600306.

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Starch-poly (vinyl acetate) materials were prepared through polymerization of vinyl acetate with starch using a ferrous ammonium sulphate-hydrogen peroxide redox system. Carboxymethylation through reaction with monochloroacetic acid in presence of alkali and graft polymerization with acrylamide and acrylonitrile of a material having 23% graft and 43% homopolymer were studied. Carboxymethylation occurs during the saponification process of starch-poly (vinyl acetate) in the alkaline medium of sodium monochloroacetate through reaction of the latter with the hydroxyl groups of starch and PVA. On the other hand, grafting seems to proceed via starch macroradicals which are created through the attack of the decomposition products of the redox system on the starch hydroxyl. Carboxymethylation of starch-poly (vinyl acetate) gives polyblended materials which exhibit 100% solubility at 100°C. The same holds true with starch-poly (vinyl acetate) grafted with acrylamide after saponification. Replacement of acrylamide with acrylonitrile results in polyblended material, the solubility of which never exceeds 20% after saponification.

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24

Waly, A., F. A. Abdel-Mohdy i A. Hebeish. "Chemical Modification of Starch-Poly (Vinyl Acetate) Materials". Polymers and Polymer Composites 6, nr 3 (marzec 1998): 161–70. http://dx.doi.org/10.1177/096739119800600306.

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Starch-poly (vinyl acetate) materials were prepared through polymerization of vinyl acetate with starch using a ferrous ammonium sulphate-hydrogen peroxide redox system. Carboxymethylation through reaction with monochloroacetic acid in presence of alkali and graft polymerization with acrylamide and acrylonitrile of a material having 23% graft and 43% homopolymer were studied. Carboxymethylation occurs during the saponification process of starch-poly (vinyl acetate) in the alkaline medium of sodium monochloroacetate through reaction of the latter with the hydroxyl groups of starch and PVA. On the other hand, grafting seems to proceed via starch macroradicals which are created through the attack of the decomposition products of the redox system on the starch hydroxyl. Carboxymethylation of starch-poly (vinyl acetate) gives polyblended materials which exhibit 100% solubility at 100°C. The same holds true with starch-poly (vinyl acetate) grafted with acrylamide after saponification. Replacement of acrylamide with acrylonitrile results in polyblended material, the solubility of which never exceeds 20% after saponification.

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25

Wang, HeYing, Fang Xu, Kun Cui, Hao Zhang, Jin Huang, QiaoLing Zhao, Tao Jiang i Zhi Ma. "Synthesis of polymethylene-b-poly(vinyl acetate) block copolymer via visible light induced radical polymerization and its application". RSC Advances 7, nr 67 (2017): 42484–90. http://dx.doi.org/10.1039/c7ra06908a.

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26

Xie, Jinchun, Hongfu Yuan, Chunfeng Song, Xiangjun Yan, Hao Yan i Xiaoyu Li. "Online determination of chemical and physical properties of poly(ethylene vinyl acetate) pellets using a novel method of near-infrared spectroscopy combined with angle transformation". Analytical Methods 11, nr 18 (2019): 2435–42. http://dx.doi.org/10.1039/c9ay00475k.

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Chuai, Hongyuan, Penghe Su, Hongchi Liu, Baolin Zhu, Shoumin Zhang i Weiping Huang. "Alkali and Alkaline Earth Cation-Decorated TiO2 Nanotube-Supported Rh Catalysts for Vinyl Acetate Hydroformylation". Catalysts 9, nr 2 (20.02.2019): 194. http://dx.doi.org/10.3390/catal9020194.

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Alkali and alkaline earth cation-decorated TiO2 nanotube (TNT)-supported rhodium catalysts were synthesized and characterized by inductively-coupled plasma optical emission spectrometer, surface characterization analyzer, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and Fourier transforming infrared spectrum, respectively. Their catalytic performances were evaluated by the hydroformylation of vinyl acetate. Results showed that both the conversion rate of vinyl acetate and selectivity for aldehyde were improved after Rh/TNTs were modified by alkali or alkali-earth cations. Such improved selectivity for aldehyde might be attributed to the presence of alkali or alkaline earth cations which enhanced CO adsorption, while the high conversion rate of vinyl acetate was likely due to the proper interaction of Lewis acid–base between cations modified TNTs and vinyl acetate.

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Wisniak, Jaime, i Abraham Tamir. "The systems vinyl acetate-toluene and vinyl acetate-propyl bromide-toluene". Journal of Chemical & Engineering Data 34, nr 3 (lipiec 1989): 301–5. http://dx.doi.org/10.1021/je00057a013.

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Peng, Piaolin, Shaolan Ding, Zhikang Wang, Yifan Zhang i Jiahao Pan. "Effect of Running Speed and Midsole Type on Foot Loading in Heel–Toe Running". Journal of Applied Biomechanics 36, nr 3 (1.06.2020): 134–40. http://dx.doi.org/10.1123/jab.2019-0236.

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The purpose of this study was to explore the immediate effects of running speed and midsole type on foot loading during heel–toe running. Fifteen healthy male college students were required to complete 3 running trials on an indoor 45-m tartan runway at 4 different speeds (3, 4, 5, and 6 m/s) using 2 different running footwear types (engineering thermoplastic polyurethane elastomer, polyurethane elastomer; and ethylene vinyl acetate, vinyl acetate). The ground reaction force and plantar pressure data were quantified. Significant speed effects were detected both in ground reaction force and plantar pressure-related data (P < .05). Vertical average loading rate was significantly less, and time to first peak occurred later for the polyurethane elastomer compared with vinyl acetate footwear (P < .05). The peak pressure of the heel, medial forefoot, central forefoot, lateral forefoot, and big toe was significantly less when subjects wore a polyurethane elastomer than vinyl acetate footwear (P < .05). Overall, our results suggested that, compared with the vinyl acetate footwear, the special polyurethane elastomer footwear that is adhered with thousands of polyurethane elastomer granules was effective at reducing the mechanical impact on the foot.

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Shaffei, K. A., A. B. Moustafa i A. I. Hamed. "The Emulsion Polymerization of Each of Vinyl Acetate and Butyl Acrylate Monomers Using bis (2-ethylhexyl) Maleate for Improving the Physicomechanical Properties of Paints and Adhesive Films". International Journal of Polymer Science 2009 (2009): 1–6. http://dx.doi.org/10.1155/2009/731971.

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Improving the water sensitivity of polyvinyl acetate PVAc films as well as pressure sensitivity, adhesion and washability of polybutyl acrylate were achieved by using bis (2-ethylhexyl) maleate (BEHM). The emulsion polymerization kinetics of vinyl acetate and butyl acrylate in presence of BEHM was studied. The order of the polymerization reaction with respect to the BEHM in presence of each of vinyl acetate and butyl acrylate was studied. The physicomechanical properties of the polyvinyl acetate films and vinyl acetate-butyl acrylate copolymer films were studied in presence of BEHM and the obtained results were matched with those prepared in the presence of pluronic F 108 and showed superior values. The obtained mean average molecular weights were found to be smaller in presence of BEHM assuring the presence of chain transfer reaction.

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Lee, Hyun Jong, Beom Goo Lee i Dae Yong Shin. "Vibration and Impact Noise Damping Properties of Wood/Polymer Composites". Materials Science Forum 486-487 (czerwiec 2005): 358–61. http://dx.doi.org/10.4028/www.scientific.net/msf.486-487.358.

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This study investigates the influence of viscoelastic properties of a series of ethylene-vinyl acetate copolymer on impact noise and vibration damping of wood/polymer/wood sandwich composites. It was found that the impact noise and vibration damping of composites are very sensitive to the state of molecular motion of polymer. The noise and vibration damping of composites was better when the polymer was in the glass transition state (vinyl acetate 55~75%) at the test-temperature, and it was worse when the polymer was in rubbery state (vinyl acetate 47~20%) or in glassy state (vinyl acetate100~87%). The impact noise decreased by about 6-12dB when the glass transition state of polymer was sandwiched between wood panels.

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32

Fayzullayev, N., F. Buronov, N. Musulmonov, O. Qodirov i F. Toshboyev. "Effect of the Number of Active Components of the Catalyst on the Yield of the Product During the Synthesis of Vinyl Acetate From Ethylene and Acetic Acid". Bulletin of Science and Practice 7, nr 4 (15.04.2021): 301–11. http://dx.doi.org/10.33619/2414-2948/65/34.

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The development of active and selective catalysts for the synthesis of vinyl acetate from ethylene and acetic acid, the effect of the amount and ratio of individual components of the catalyst to control the catalytic properties of the introduced components were studied. In vinyl acetate synthesis, the effects of each component were studied to describe the effect of catalyst constituents on its properties, and empirical one-factor mathematical dependencies were obtained. Their generalized mathematical relationships of the activities of the catalysts, defined as the rates of the reactions of the formation of vinyl acetate and CO2, have been proposed. As a result of the research, a mathematical model was proposed to select the most optimal composition of the catalyst. The activity of the catalyst containing 0.4%Pd+4%Cu+7%CH3COOK/HSZ averaged 700 g VA/(l×cat×h) at 93–97% selectivity of ethylene-vinyl acetate formation.

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33

SADA, Tomoaki. "Ethylene-Vinyl Acetate Emulsion". Journal of The Adhesion Society of Japan 41, nr 11 (2005): 452–58. http://dx.doi.org/10.11618/adhesion.41.452.

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Jung, Hye Min, Eun Mi Lee, Byung Chul Ji, Sung Ok Sohn, Han Do Ghim, Hyunju Cho, Young A. Han, Jin Hyun Choi, Jae Deuk Yun i Jeong Hyun Yeum. "Preparation of poly(vinyl acetate)/clay and poly(vinyl acetate)/poly(vinyl alcohol)/clay microspheres". Fibers and Polymers 7, nr 3 (wrzesień 2006): 229–34. http://dx.doi.org/10.1007/bf02875677.

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Rees, Gwilym J. "Synthesis of vinyl phenyl acetate and an evaluation of vinyl chloride/vinyl phenyl acetate copolymers". Journal of Applied Polymer Science 43, nr 2 (20.07.1991): 341–45. http://dx.doi.org/10.1002/app.1991.070430212.

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Hayashi, Sadao, Akihiko Komatsu i Toshihiro Hirai. "Seeded polymerization of vinyl acetate using monodisperse poly(vinyl acetate) latex particles". Journal of Polymer Science Part A: Polymer Chemistry 27, nr 1 (15.01.1989): 157–69. http://dx.doi.org/10.1002/pola.1989.080270114.

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Lavrov, N. A. "Features of radical copolymerization initiated by manganese triacetylacetonate". Plasticheskie massy, nr 7-8 (18.09.2021): 11–14. http://dx.doi.org/10.35164/0554-2901-2021-7-8-11-14.

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A comprehensive study of the kinetics of reactions of binary copolymerization of vinyl acetate with N-vinyl (N-vinylsuccinimide and N-vinyl-3(5)-methylpyrazole) and acrylic (2-hydroxyethylmethacrylate) monomers in different media was conducted. It is shown that the use of manganese triacetylacetonate as an initiator makes it possible to bring together the relative activities of monomers due to the complexation of manganese trisacetylacetonate and vinyl acetate molecules. This leads to a change in the microstructure of copolymers and to the production of macrochains with improved interleaving of monomeric links.

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38

Naghash, Hamid Javaherian, i Elham Kasaeian Naeni. "Synthesis of Novel Silicone Containing Vinylic Monomer and Its Uses in the Waterborne Polyurethane-Veova/Vinyl Acetate Hybrid Emulsion Copolymers". Polymer Korea 35, nr 5 (30.09.2011): 409–18. http://dx.doi.org/10.7317/pk.2011.35.5.409.

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Ramesh S, Ramesh S., i Punithamoorthy K. Punithamoorthy K. "Synthesis And Characterization Of Ethylene Vinyl Acetate (Eva) / Poly Urethane Acrylate (Pua) Nano Clay Composites". International Journal of Scientific Research 1, nr 4 (1.06.2012): 8–9. http://dx.doi.org/10.15373/22778179/sep2012/3.

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Syayleva, M. V., A. M. Bukanov, K. A. Zvezdenkov i V. N. Voloshin. "THE STUDY OF THE PROPERTIES OF VULCANIZATES BASED ON ETHYLENE VINYL ACETATE RUBBERS WITH DIFFERENT CONTENT OF VINYL ACETATE UNITS". Fine Chemical Technologies 13, nr 3 (28.06.2018): 79–85. http://dx.doi.org/10.32362/24106593-2018-13-3-79-56.

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The article studies the structure and properties of ethylene vinyl acetate rubbers and the influence of the vinyl acetate (VA) units content in the rubber on the technological, physical-mechanical, operating and electrical properties of vulcanizates. The results of the study prove that the distinctive feature of ethylene vinyl acetate rubbers compared to other rubbers is their thermoplastic properties and low viscosity. Besides, the high resistance to ozone, heat and oil resistance and good mechanical properties of vulcanizates based on them make this type of polymer materials very promising for the creation of modern products. It is shown that the values of elasticity modulus, strength, elongation and tear resistance are increased with increasing VA units content in the rubber. Besides, swelling in hydrocarbon media decreases. Vulcanizates containing 40-45% of VA have satisfactory electrical characteristics and good moisture resistance and can be used as the base insulating rubber. Vulcanizates with a high content of vinyl acetate units (60-70%) have high oil and heat resistance. Therefore, their use in rubber compounds for cable jackets is most effective. The study of the properties of ethylene vinyl acetate rubbers and their vulcanizates allowed to develop formulations of insulating and jacket rubbers and to determine the most promising areas of their application for modern cable products of special purpose in the petrochemical, aerospace, transport and shipbuilding industries.

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Mariotti, Giulia, i Lorenzo Vannozzi. "Fabrication, Characterization, and Properties of Poly (Ethylene-Co-Vinyl Acetate) Composite Thin Films Doped with Piezoelectric Nanofillers". Nanomaterials 9, nr 8 (20.08.2019): 1182. http://dx.doi.org/10.3390/nano9081182.

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Ethylene vinyl acetate (EVA) is a copolymer comprehending the semi-crystalline polyethylene and amorphous vinyl acetate phases, which potentially allow the fabrication of tunable materials. This paper aims at describing the fabrication and characterization of nanocomposite thin films made of polyethylene vinyl acetate, at different polymer concentration and vinyl acetate content, doped with piezoelectric nanomaterials, namely zinc oxide and barium titanate. These membranes are prepared by solvent casting, achieving a thickness in the order of 100–200 µm. The nanocomposites are characterized in terms of morphological, mechanical, and chemical properties. Analysis of the nanocomposites shows the nanofillers to be homogeneously dispersed in EVA matrix at different vinyl acetate content. Their influence is also noted in the mechanical behavior of thin films, which elastic modulus ranged from about 2 to 25 MPa, while keeping an elongation break from 600% to 1500% and tensile strength from 2 up to 13 MPa. At the same time, doped nanocomposite materials increase their crystallinity degree than the bare ones. The radiopacity provided by the addition of the dopant agents is proven. Finally, the direct piezoelectricity of nanocomposites membranes is demonstrated, showing higher voltage outputs (up to 2.5 V) for stiffer doped matrices. These results show the potentialities provided by the addition of piezoelectric nanomaterials towards mechanical reinforcement of EVA-based matrices while introducing radiopaque properties and responsiveness to mechanical stimuli.

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42

Wang, Jun. "Preparation and Properties of Nanocomposites Based on Poly(Vinyl acetate) and Montmorillonite Organized with Acrylic Acid". Advanced Materials Research 335-336 (wrzesień 2011): 3–11. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.3.

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The nanocomposites of poly(vinyl acetate)/montmorillonite (PVAc/MMT) were prepared using vinyl acetate and organically modified alkaline calcium base montmorillonite (MMT) by in situ emulsion copolymerization. The organic modification was acrylic acid including terminal reactive vinylic group. The samples were characterized using fourier transformation infrared spectroscopy (FT-IR), X-ray diffraction (XRD). Thermal properties of the PVAc/MMT films were studied by thermogravimetric (TG) and differential scanning calorimetric (DSC). The FT-IR results indicated that the vinyl group on the surface of the vinyl MMT nanoparticles had been successfully copolymerized with vinyl acetate. The XRD results demonstrated that the MMT was exfoliated during polymerization. The exfoliated PVAc/MMT nanocomposites showed a lower glass transition temperature (Tg) and a worse thermal stability compared with the pure PVAc. However, bonding power of the nanocomposite latex of PVAc/MMT was improved due to the strong interaction between silica nanoparticles and polymer matrix via covalent bonds.

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43

SATO, Yoshio, Hiroshi INOMAT i Kunio ARAI. "Solubilities of fifteen organic substances in poly(vinyl chloride), poly(vinyl acetate), and vinyl chloride-vinyl acetate copolymer." KOBUNSHI RONBUNSHU 45, nr 3 (1988): 287–89. http://dx.doi.org/10.1295/koron.45.287.

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Resa, José M., Cristina González, Salomé Ortiz de Landaluce i Juan Lanz. "Vapor−Liquid Equilibrium of Binary Mixtures Containing Methanol + Propyl Acetate, Methanol + Isopropyl Acetate, Vinyl Acetate + Propyl Acetate, and Vinyl Acetate + Isopropyl Acetate at 101.3 kPa". Journal of Chemical & Engineering Data 46, nr 5 (wrzesień 2001): 1338–43. http://dx.doi.org/10.1021/je0100342.

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45

Andonova, Velichka Y., George S. Georgiev, Ventsislava T. Georgieva, Nadia L. Petrova i Margarita Kasarova. "Indomethacin Nanoparticles for Applications in Liquid Ocular Formulations / Наночастицы С Индометацином Для Применения В Жидких Лекарственных Формах Для Глаз". Folia Medica 55, nr 1 (1.01.2013): 76–82. http://dx.doi.org/10.2478/folmed-2013-0009.

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Abstract Studies in recent years have consistently shown that polymeric drug nanocarriers can be used in drug release and drug delivery systems to treat eye disorders. To achieve effective control over drug delivery, it is of crucial importance what kind of polymer and which method for drug inclusion in the nanoscale carrier we choose and what conditions are needed for the performance of this process. OBJECTIVE: The aim of this study was to produce poly(vinyl acetate) nanoparticles with indomethacin incorporated in them, assess the effect of time for dialysis of the residual monomer and initiator on the degree of incorporation of indomethacin in the nanoparticles and on the kinetics of its release, to include them in ophtalmic formulations. MATERIALS AND METHODS: Poly(vinyl acetate) nanoparticles with indomethacin were obtained by emulsion radical polymerization of vinyl acetate in the presence of indomethacin (in situ inclusion) and the absence of emulsifier. To release the residual monomer and initiator (ammonium persulfate) the obtained latexes were dialysed for 6, 9, 18 and 23 hours and then the nanoparticles were freeze-dried. Structural analysis was performed by transmission electronic microscopy, infrared spectroscopy, differential thermal analysis and thermogravimetry. Release of indomethacin was observed using ultraviolet spectroscopy. RESULTS: We proved the delayed release of indomethacin from the poly(vinyl acetate) nanocarrier and the lack of chemical interaction between the polymer and indomethacin. After 9-hour dialysis the initiator and the residual vinyl acetate were removed from the nanoparticles, while the entrapped indomethacin kept therapeutic concentrations. CONCLUSIONS: Dialysis for more than 6 and no more than 9 hours is recommended to remove the residual monomer and initiator when preparing indomethacin nanoparticles by in situ radical emulsion polymerization of vinyl acetate, for inclusion in liquid ocular formulations.

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Suleymanova, Aygul G., Erik R. Khusainov, Regina R. Spiridonova i Aleхander S. Sirotkin. "Synthesis of water resistant and biostable polyvinyl acetate dispersions". Butlerov Communications 58, nr 4 (30.04.2019): 92–97. http://dx.doi.org/10.37952/roi-jbc-01/19-58-4-92.

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The characteristics of the emulsion polymerization of vinyl acetate in the presence of inorganic compounds such as silicon dioxide, titanium dioxide and polyhexamethylene guanidine hydrochloride are studied. It was found that, under the same synthesis conditions, inorganic additives affect the polymerization mechanism of vinyl acetate. The highest conversion of vinyl acetate can be obtained with the introduction of 0.5 wt% silicon dioxide. Polyhexamethylene guanidine hydrochloride also accelerates the reaction rate at the initial moment of time. However, the combined use of silicon dioxide and polyhexamethylene guanidine hydrochloride also reduces the reaction rate in comparison with the syntheses of vinyl acetate, carried out in the presence of each additive separately. The introduction of titanium dioxide, on the contrary, inhibits the reaction. However, when titanium dioxide and polhexamethylene guanidine hydrochloride are used together, the curve of the dependence of vinyl acetate conversion on time is close in process speed to the polymerization process of vinyl acetate without additives. The introduction of silicon dioxide and titanium dioxide makes it possible to increase by 1.5 times the water resistance of the resulting dispersions after short-term keeping glued samples in the water. At the same time, an increase in the water resistance of the samples after long-term contact with water allows only silica. The joint introduction of polyhexamethylene guanidine hydrochloride and silicon dioxide also led to improve the water resistant of adhesive joints, but not as significantly as in the case of the separate introduction of only silica. Polyhexamethylene guanidine hydrochloride increases the fungicidal activity of the resulting dispersions, and its combined use with titanium dioxide made it possible to improve the water resistance of the dispersion during long-term contact with water, in contrast to samples modified only with titanium dioxide. In addition, these samples showed greater fungicidal activity than samples containing silica and polymethylene guanidine hydrochloride.

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Noruzman, A. H., M. Ismail, M. A. R. Bhutta, T. O. Yusuf, I. A. Shehu i I. O. Hassan. "Strength and Durability Characteristics of Polymer Modified Concrete Incorporating Vinyl Acetate Effluent". Advanced Materials Research 690-693 (maj 2013): 1053–56. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.1053.

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Waste generation from surface coating industries brings about worsening of the environmental scenery and human health in the world. The production of these wastes is detrimental to surrounding areas in landfill or dumping spaces, therefore necessary action is required to minimize the unpleasant situation. This research is aimed at using waste generated from the manufacture of paint known as vinyl acetate effluent as an admixture in concrete. The material is rinse water taken from the cleaning process reactor. Concrete of 0% vinyl acetate effluent cured in water with those of 2.5%, 5%, 10% and 20% by weight of cement were produced and cured using Japanese standard. The specimens were tested for compressive strength, splitting tensile strength and durability at 3, 7 and 28 days. Findings show that incorporating of 2.5% of Vinyl acetate effluent improves strength properties of concrete. Higher resistance of water absorption and sulfate conditions were observed in polymer modified concrete. The study has shown that incorporating vinyl acetate effluent in producing polymer modified concrete could bring lights of using the waste material for sustainable and environmental preservations.

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Go, Sun-Ho, Min-Sang Lee, Chang-Gi Hong, Lee-Ku Kwac i Hong-Gun Kim. "Correlation between Drop Impact Energy and Residual Compressive Strength According to the Lamination of CFRP with EVA Sheets". Polymers 12, nr 1 (16.01.2020): 224. http://dx.doi.org/10.3390/polym12010224.

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Carbon-fiber-reinforced plastic is an important building material; however, its application is limited because of its brittleness, leading to vulnerability under shock. Thus, the strength performance of carbon-fiber-reinforced plastics needs to be improved. Here, the drop impact test was conducted to analyze the impact energy and fracture characteristics of carbon-fiber-reinforced plastics and ethylene vinyl acetate sheets. The compression after impact test was performed to assess the residual compressive strength. The thermal energy generated was measured as change in temperature at the time of fracture to investigate the relationship between thermal and mechanical properties. The impact absorption efficiency of 100% was achieved when the carbon-fiber-reinforced plastics specimen was laminated with four or more sheets of ethylene vinyl acetate. The thermal energy generated during impact, the impact load, and the compression after impact test strength was reduced with the increasing number of laminated ethylene vinyl acetate layers. Our results showed that, by carefully selecting the optimal conditions of fabricating the carbon-fiber-reinforced plastic/ethylene vinyl acetate composites, carbon composite materials can be used for impact mitigation.

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Souriyan-Reyhani pour, Hamed, Ramin Khajavi, Mohammad Esmaeil Yazdanshenas, Payam Zahedi i Mohammad Mirjalili. "Cellulose acetate/poly(vinyl alcohol) hybrid fibrous mat containing tetracycline hydrochloride and phenytoin sodium: Morphology, drug release, antibacterial, and cell culture studies". Journal of Bioactive and Compatible Polymers 33, nr 6 (31.05.2018): 597–611. http://dx.doi.org/10.1177/0883911518779186.

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The objective of this study was to introduce an electrospun hybrid fibrous mat (a dual-fiber drug delivery system) based on cellulose acetate and poly(vinyl alcohol) containing tetracycline hydrochloride and phenytoin sodium, respectively. Characterization of samples was carried by morphology, drug release, cell cytotoxicity, adhesion, antibacterial property, and wettability investigations. The results showed a uniform shape and a narrow diameter distribution of fibers (between 160 ± 20 nm) for fabricated cellulose acetate/poly(vinyl alcohol) hybrid fibrous mat. The tetracycline hydrochloride release from cellulose acetate significantly decreased due to gel formation of poly(vinyl alcohol) in aqueous media. The best fit for drug release kinetic of hybrid sample was Higuchi model. Sample with tetracycline hydrochloride and phenytoin sodium drugs showed improved cell growth, viability, and antibacterial activity against Escherichia coli (~89%) and Staphylococcus aureus (~98%) in comparison with sample without drugs. The hydrophilic property of cellulose acetate/poly(vinyl alcohol) fibrous sample containing the drugs was also remarkable (~45°). To consider the obtained results, the presented hybrid fibrous mat shows a high potent for biomedical applications.

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Musaev, Sayfullo, i Gulnoz Samiyeva. "Study of the morphology of shoe sole composites based on domestic suspension polyvinyl chloride and ethylene-vinyl acetate copolymer". E3S Web of Conferences 390 (2023): 05018. http://dx.doi.org/10.1051/e3sconf/202339005018.

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The paper studies the surface morphology of the initial polymers and the mixture using a scanning electron microscope SEM - EVO MA 10 (Zeiss, Germany). The X-ray phase analysis was carried out on a Panalytical Empyrean diffractometer. It has been proven that polymer mixtures based on domestic suspension polyvinyl chloride and ethylene-vinyl acetate copolymer, obtained by the method of "thermomechanical" mixing, are two-phase systems consisting of a phase of polyvinyl chloride and an ethylene- vinyl acetate copolymer. It was concluded that suspension polyvinyl chloride is fundamental in this system, which determines the main deformation-strength properties of the mixture. In the process of mixing a certain ratio of copolymer and thermoplastic, two-phase systems are formed, that is, mechanical mixtures of technologically compatible polymers with very close values of solubility parameters are formed. It has been determined that polymer mixtures based on domestic suspension polyvinyl chloride and an ethylene-vinyl acetate copolymer, obtained by the method of "thermomechanical" mixing, are two-phase systems consisting of a phase of polyvinyl chloride and an ethylene-vinyl acetate copolymer.

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