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Artículos de revistas sobre el tema "Free radical copolymerisation"

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Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 19 de febrero de 2023

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1

Boulding, Natasha A., Jonathan M. Millican y Lian R. Hutchings. "Understanding copolymerisation kinetics for the design of functional copolymers via free radical polymerisation". Polymer Chemistry 10, n.º 41 (2019): 5665–75. http://dx.doi.org/10.1039/c9py01294j.

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2

Guo, Xiaopeng, Haihua Wang y Deqiang Li. "Free-radical graft copolymerisation of fluorine nanocellulose surfactants". Surface Innovations 7, n.º 3-4 (julio de 2019): 230–41. http://dx.doi.org/10.1680/jsuin.19.00009.

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3

Carlson, Rebecca K., Rachel A. Lee, Jed H. Assam, Rollin A. King y Megan L. Nagel. "Free-radical copolymerisation of acrylamides, acrylates, and α-olefins". Molecular Physics 113, n.º 13-14 (3 de marzo de 2015): 1809–22. http://dx.doi.org/10.1080/00268976.2015.1015641.

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4

Coote, M. L. y T. P. Davis. "The mechanism of the propagation step in free-radical copolymerisation". Progress in Polymer Science 24, n.º 9 (noviembre de 1999): 1217–51. http://dx.doi.org/10.1016/s0079-6700(99)00030-1.

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5

Ken Busfield, W., I. Darren Grice y Ian D. Jenkins. "Free radical initiation mechanisms in copolymerisation studied by the nitroxide trapping technique". Polymer International 27, n.º 2 (1992): 119–23. http://dx.doi.org/10.1002/pi.4990270205.

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6

Fellows, Christopher. "Preliminary observations on the copolymerisation of acceptor monomer:donor monomer systems under microwave irradiation". Open Chemistry 3, n.º 1 (1 de marzo de 2005): 40–52. http://dx.doi.org/10.2478/bf02476236.

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AbstractThe mechanistic rationalisation of specific ‘microwave effects’ previously reported in a range of chemical reactions suggests that they may be observable in the freeradical copolymerisation of comonomer pairs capable of forming donor-acceptor complexes. Polymerisation under microwave irradiation is carried out for several comonomer pairs with weak donor-acceptor interactions, and no acceleration in rate or change in degree of alternation attributable to changes in propagation are observed. An increase in reaction rate of 150–200 % is observed for all systems, with trends in molecular weight suggesting this was due to an increase in radical flux. This is consistent with earlier reports of rate enhancement for free-radical polymerisations using the initiator 2,2′-azobis-isobutyronitrile, and it is proposed that microwave irradiation may reduce the amount of geminate radical recombination.
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7

Grabchev, Ivo y Seher Sali. "Photophysical Properties of Fluorescent Copolymers of Methylmethacrylate for Use in Liquid Crystalline Systems". Zeitschrift für Naturforschung A 60, n.º 11-12 (1 de diciembre de 2005): 831–36. http://dx.doi.org/10.1515/zna-2005-11-1212.

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The free radical copolymerisation of five fluorescent 4-allylamino-N-phenyl-substituted 1,8-naphthalimide dyes (MDs) with methylmethacrylate (MMA) has been investigated. The utility of the copolymers prepared as fluorescent component in polymer/liquid crystal systems has been investigated. The basic photophysical properties of monomeric dyes, poly(MMA-co-MD) and poly(MMAco- MD)/liquid crystal mixtures are discussed. The influence of poly(MMA-co-MD) on the phase transition temperature from the nematic to the isotropic state of poly(MMA-co-MD)/liquid crystal mixtures have also been investigated.
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8

Favresse, Philippe, André Laschewsky, Claudia Emmermann, Leo Gros y Andreas Linsner. "Synthesis and free radical copolymerisation of new zwitterionic monomers: amphiphilic carbobetaines based on isobutylene". European Polymer Journal 37, n.º 5 (mayo de 2001): 877–85. http://dx.doi.org/10.1016/s0014-3057(00)00215-9.

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9

Mukherjee, Aparna, Deepshikha Datta y Gopinath Halder. "Synthesis and characterisation of rice-straw-based grafted polymer composite by free radical copolymerisation". Indian Chemical Engineer 61, n.º 2 (3 de julio de 2018): 105–19. http://dx.doi.org/10.1080/00194506.2018.1490930.

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10

Milovanovic, Milos, Snezana Trifunovic, Lynne Katsikas y Ivanka Popovic. "Preparation and modification of itaconic anhydride-methyl methacrylate copolymers". Journal of the Serbian Chemical Society 72, n.º 12 (2007): 1507–14. http://dx.doi.org/10.2298/jsc0712507m.

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The free radical copolymerisation of itaconic anhydride and methyl methacrylate in solution was studied at 60 ?C. The copolymer composition was determined by 1H-NMR spectroscopy and the obtained monomer reactivity ratios were calculated, rITA = 1.35?0.11; rMMA = 0.22?0.22 (by the Fineman-Ross method) and rITA = 1.27?0.38; rMMA = 0.10?0.05 (by the Mayo-Lewis method). The synthesised copolymers were modified by reaction with di-n-butyl amine. The copolymer composition after amidation was determined by elemental analysis via the nitrogen content. Amidation of the anhydride units in the copolymers with di-n-butyl amine resulted in complete conversion to itaconamic acid.
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11

Nair, C. P. Reghunadhan, Dona Mathew y K. N. Ninan. "Free radical copolymerisation of N-(4-hydroxy phenyl) maleimide with vinyl monomers: solvent and penultimate-unit effects". European Polymer Journal 35, n.º 10 (octubre de 1999): 1829–40. http://dx.doi.org/10.1016/s0014-3057(98)00278-x.

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12

Vorotnikova, Natalya A., Mariya V. Edeleva, Olga G. Kurskaya, Konstantin A. Brylev, Alexander M. Shestopalov, Yuri V. Mironov, Andrew J. Sutherland, Olga A. Efremova y Michael A. Shestopalov. "One-pot synthesis of {Mo6 I8 }4+ -doped polystyrene microspheres via a free radical dispersion copolymerisation reaction". Polymer International 66, n.º 12 (18 de octubre de 2017): 1906–12. http://dx.doi.org/10.1002/pi.5473.

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13

von Sonntag, Justus, Igor Janovský, Sergej Naumov y Reiner Mehnert. "Free Radical Copolymerisation ofN-Methylmaleimide and 2,3-Dihydrofuran Initiated by their Radical Cations. A Low Temperature EPR Study of a Binary System". Macromolecular Chemistry and Physics 203, n.º 3 (1 de febrero de 2002): 580–85. http://dx.doi.org/10.1002/1521-3935(20020201)203:3<580::aid-macp580>3.0.co;2-5.

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14

Nassar, Nazim, Felicity Whitehead, Taghrid Istivan, Robert Shanks y Stefan Kasapis. "Manipulation of the Glass Transition Properties of a High-Solid System Made of Acrylic Acid-N,N′-Methylenebisacrylamide Copolymer Grafted on Hydroxypropyl Methyl Cellulose". International Journal of Molecular Sciences 22, n.º 5 (6 de marzo de 2021): 2682. http://dx.doi.org/10.3390/ijms22052682.

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Crosslinking of hydroxypropyl methyl cellulose (HPMC) and acrylic acid (AAc) was carried out at various compositions to develop a high-solid matrix with variable glass transition properties. The matrix was synthesized by the copolymerisation of two monomers, AAc and N,N′-methylenebisacrylamide (MBA) and their grafting onto HMPC. Potassium persulfate (K2S2O8) was used to initiate the free radical polymerization reaction and tetramethylethylenediamine (TEMED) to accelerate radical polymerisation. Structural properties of the network were investigated with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), modulated differential scanning calorimetry (MDSC), small-deformation dynamic oscillation in-shear, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show the formation of a cohesive macromolecular entity that is highly amorphous. There is a considerable manipulation of the rheological and calorimetric glass transition temperatures as a function of the amount of added acrylic acid, which is followed upon heating by an extensive rubbery plateau. Complementary TGA work demonstrates that the initial composition of all the HPMC-AAc networks is maintained up to 200 °C, an outcome that bodes well for applications of targeted bioactive compound delivery.
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15

Cowie, J. M. G., I. J. McEwen y D. J. Yule. "The influence of solvent on the apparent reactivity ratios in free radical copolymerisation reactions between itaconic acid and 2-hydroxyethyl acrylate". European Polymer Journal 36, n.º 9 (septiembre de 2000): 1795–803. http://dx.doi.org/10.1016/s0014-3057(99)00257-8.

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16

Dobie, Christopher G., MarijaVicevic y Kamelia V. K. Boodhoo. "An evaluation of the effectiveness of continuous thin film processing in a spinning disc reactor for bulk free-radical photo-copolymerisation". Chemical Engineering and Processing: Process Intensification 71 (septiembre de 2013): 97–106. http://dx.doi.org/10.1016/j.cep.2013.03.011.

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17

Jin, Bei, Xiaosong Zhou, Bing Li, Caiyan Chen, Xiaosa Zhang y Siqiao Chen. "Structure and Antioxidant Activity of Soy Protein Isolate-Dextran Conjugates Obtained by TiO2Photocatalysis". BioMed Research International 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/150603.

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The aim of this study was to investigate the structural characteristics and antioxidant activities of soy protein isolate- (SPI-) dextran conjugates obtained by TiO2photocatalysis treatment. Results revealed that the UV-vis absorption and the fluorescence intensity increased as the photocatalytic power increased (P<0.05). Higher photocatalytic power could promote the extent of glycation and the formation of high molecular weight SPI-dextran conjugates, which were evidenced by free amino group content and sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis. The Fourier transform infrared (FT-IR) spectra suggested that the amide I, II, and III bands of SPI were altered by the glycation induced by TiO2photocatalysis. Moreover, significant changes of secondary structure occurred in SPI-dextran conjugates. Theα-helix,β-sheet,β-turns, and random coil were changed from approximately 10.6%, 37.9%, 12.9%, and 38.6% to 3.8%, 10.4%, 17.7%, and 68.8%, respectively, after treatment at photocatalytic power of 1000 W. In addition, SPI-dextran conjugates obtained by TiO2photocatalysis treatment exhibited high hydroxyl radical scavenging activity and possessed increased reducing power. All data indicated that TiO2photocatalysis was an efficient method for promoting protein-polysaccharide copolymerisation.
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18

Othman, S., I. Barudio, G. Févotte y T. F. McKenna. "On-Line Monitoring and Modelling of Free Radical Copolymerisations: Butyl Acrylate/Vinyl Acetate". Polymer Reaction Engineering 7, n.º 1 (enero de 1999): 1–42. http://dx.doi.org/10.1080/10543414.1999.10744498.

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19

Jones, Richard G., Sangwoong Yoon y Yukio Nagasaki. "Facile synthesis of epoxystyrene and its copolymerisations with styrene by living free radical and atom transfer radical strategies". Polymer 40, n.º 9 (abril de 1999): 2411–18. http://dx.doi.org/10.1016/s0032-3861(98)00442-x.

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20

Jonckheere, Laura, Eric J. Goethals y Filip E. Du Prez. "Functional segmented polymer networks based on polytetrahydrofuran and poly(vinylbenzyl chloride)". e-Polymers 3, n.º 1 (1 de diciembre de 2003). http://dx.doi.org/10.1515/epoly.2003.3.1.829.

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Abstract Functional segmented polymer networks (FSPNs) were synthesised via free radical initiated copolymerisation of polytetrahydrofuran (PTHF) bis-macromonomers with vinylbenzyl chloride (VBCl). The purpose of this work was to create FSPNs, providing supports with a functional group that can be substituted and may serve to immobilise other reagents such as catalysts. After the preparation and detailed characterisation of several PTHF bis-macromonomers, FSPNs were prepared with varying molecular weight of the PTHF chain and varying PTHF/ PVBCl ratio. Measurements of the soluble fraction and elemental analyses demonstrated that FSPNs with a wide composition range could be prepared. From dynamic-mechanical and thermal analyses, it could be concluded that most FSPNs showed some degree of compatibility and complete absence of crystallinity. The mechanical properties of the FSPNs are directly related to their composition. The degree of substitution of all networks is close to quantitative.
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