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Добірка наукової літератури з теми "Polypropylene Effect of temperature on"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Polypropylene Effect of temperature on"

1

Apel, P. Yu, A. Yu Didyk, L. I. Kravets, V. I. Kuznetsov, and B. I. Fursov. "Registration temperature effect in polypropylene detectors." Nuclear Tracks and Radiation Measurements 22, no. 1-4 (January 1993): 93–96. http://dx.doi.org/10.1016/0969-8078(93)90023-w.

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Chen, Jianjun, Yueyue Jia, Zhiye Zhang, Xinlong Wang, and Lin Yang. "Effects of Chlorinated Polypropylene on the Conformation of Polypropylene in Polypropylene/Chlorinated Polypropylene/Polyaniline Composites." Journal of Spectroscopy 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/317813.

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We investigated the changes in the conformation and crystalline structure of polypropylene (PP) using a combination of Fourier transform infrared spectroscopy (FTIR), wide-angle X-ray diffraction (WAXD), and differential scanning calorimetry (DSC) based on PP/chlorinated PP (CPP)/polyaniline (PANI) composites. The DSC heating thermograms and WAXD patterns of the PP/CPP/PANI composites showed that theβ-crystal was affected greatly by the CPP content. Characterization of the specific regularity in the infrared band variation showed that the conformational orders of the helical sequences in PP exhibited major changes that depended on the CPP content. Initially, the intensity ratio ofA840/A810increased with the CPP concentration and reached its maximum level when the CPP content was <13.22% before decreasing as the CPP content increased further. The effect of increased temperature on the conformation of PP was studied by in situ FTIR. Initially, the intensity ratio ofA999/A973decreased slowly with increasing the temperature up to 105°C before decreasing sharply with further increases in temperature and then decreasing slowly again when the temperature was higher than 128°C.
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3

Wadas, W., and E. Kosterna. "Effect of perforated foil and polypropylene fibre covers on development of early potato cultivars." Plant, Soil and Environment 53, No. 3 (January 7, 2008): 136–41. http://dx.doi.org/10.17221/2223-pse.

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The effect of perforated polyethylene foil and polypropylene fibre cover on the development of the early potato cultivars Aksamitka and Cykada was investigated. The use of the covers resulted in an increase in the soil temperature at the depth of 100 mm on average by 2.2&deg;C at 8 a.m. and by 4.0&deg;C at 2 p.m. in the year with warm spring and by 1.5&deg;C and 3.2&deg;C in the year with cold spring, respectively. A higher increase in the soil temperature, on average by 1&minus;2&deg;C, was caused by the use of the perforated foil than by the use of the polypropylene fibre. The increase in the soil temperature as a result of covering forced the plant emergence on average by 5 days and shortened the period from planting to tuber setting by 5 days in comparison with the cultivation with no plant covering. The higher favourable effect of covering was obtained in the year with the lowest air and soil temperatures in May. The use of the covers at that time forced the plant emergence and shortened the period from planting to tuber setting on average by 6 days. A higher soil temperature increase was observed under the perforated foil than under the polypropylene fibre, which resulted in an earlier occurrence of the successive plant development phases, on average by 1&minus;2 days.
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Chang, Chuan Peng, Shi Wu Huang, Xue Feng Li, Bo Tian, and Zi Yi Hou. "A Study of the Capability for Fire Resistance of Polypropylene Fibre Concrete." Advanced Materials Research 857 (December 2013): 116–23. http://dx.doi.org/10.4028/www.scientific.net/amr.857.116.

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The purpose of this paper is to examine the effect of various polypropylene fibre additions (length and content) to concrete on compressive strength and explosive spalling when subjected to high temperatures, which simulate the building or tunnel fires. The experimental results show that the compressive strength of polypropylene fiber concrete (PFC) and plain concrete decreases with increasing temperature. Fibre content in a certain range has a small effect on the compressive strength of the concrete, therefore the polypropylene (PP) fibers has a great influence on the anti-spalling behavior of concrete under fire loading to ensure the integrity of the structure. Keywords: concrete, polypropylene fibre, high temperature, compressive strength, spalling
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Proklamita, Tri Luchi, and Aloysius Ng Lende. "THE EFFECT OF POLYPROPYLENE THICKNESS AND TEMPERATURE ON THE QUALITY OF CAYENNE PEPPER DURING STORAGE." International Journal of Research -GRANTHAALAYAH 8, no. 10 (November 6, 2020): 278–84. http://dx.doi.org/10.29121/granthaalayah.v8.i10.2020.1901.

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This study aims to determine the effect of different combinations of plastic thickness and temperature treatment combinations on the quality of cayenne pepper during storage, to determine the combination of plastic thickness and the right temperature to maintain the quality of cayenne pepper during storage. This study used a completely randomized design (CRD) with 9 treatments. The treatments tried in this study were thickness and temperature, namely Polypropylene 0.3 mm + tissue at 5°C, Polypropylene 0.3 mm + tissue at 10°C, Polypropylene 0.3 mm + tissue at 15°C, Polypropylene 0.4 mm + tissue at 5°C, Polypropylene 0.4 mm + tissue at 10°C, Polypropylene 0.4 mm + tissue at 15°C, Polypropylene 0.5 mm + tissue at 5°C, Polypropylene 0.5 mm + tissue at 10°C, Polypropylene 0.5 mm + tissue at 15°C. The treatment was repeated 3 times so that there were 27 experimental units. The results that showed the combination treatment of packaging thickness and temperature had a very significant effect on the storage quality of cayenne pepper on weight loss, vitamin C, texture, moisture content, and color, but had no significant effect on the color of the 8th day of the watershed. The combination treatment of plastic packaging thickness of 0.5 mm and temperature of 5°C can give the best effect on texture, vitamin C, moisture content, weight loss, and color, but at a thickness of 0.3 mm plastic and a temperature of 15°C does not give the best results on color 8th day.
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Seyam, Ahmed Maher, Samir Shihada, and Rita Nemes. "Effects of polypropylene fibers on ultra high performance concrete at elevated temperature." Concrete Structures 21 (2020): 11–16. http://dx.doi.org/10.32970/cs.2020.1.2.

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This paper presents an experimental study to evaluate the influence of polypropylene on fire resistance of ultra-high performance concrete (UHPC). Concrete mixtures are prepared by using different percentages of polypropylene fibres 0%, 0.75% and 1.5%, by volume. Samples are heated to 250 or 500 °C, for exposures 2.5 or 5 hours, and tested after cooling for compressive strength and flexural tensile strength. The research includes the use of mineral admixture of a recognized, polypropylene fibre, quartz sand, superplasticizers and without using any type of aggregates other than the quartz sand. The effect on subjected samples to elevated temperature up to 250 ºC and 500 ºC for durations 2.5 hours and 5 hours was studied for each mix and comparing the results of compressive strength and tensile strength among the mixes. Results obtained, showed that adding 0.75% of polypropylenes fibres only to a concrete mixture, improved the fire resistance of the concrete by 27% and 72% when the samples exposed to 250 ºC and 500 ºC for 2.5 hours respectively, compared with concrete mixes without fibres. In addition, the residual strength was improved by 39% and 14% when the samples exposed to 250 ºC and 500 ºC for 5 hours, respectively.
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Jiang, Binhui, Libo Cao, and Feng Zhu. "Dynamic tensile behavior of polypropylene with temperature effect." Composites Part B: Engineering 152 (November 2018): 300–304. http://dx.doi.org/10.1016/j.compositesb.2018.08.133.

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Koňáková, Dana, and Eva Vejmelková. "Reinforced Cement Composites – Effect of Hybrid Fibres on Selected Properties." Materials Science Forum 824 (July 2015): 179–83. http://dx.doi.org/10.4028/www.scientific.net/msf.824.179.

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In this article selected properties of a glass and polypropylene fibre reinforced cement composite materials are studied. They are determined either after preceding thermal treatment or during thermal loading. Basic physical properties (in concrete terms bulk density, matrix density and open porosity), mechanical properties (in concrete terms tensile strength and bending strength) are determined after subjecting the specimens to the pre-heating temperatures of 600°C, 800°C and 1000°C. The linear thermal expansion coefficient is measured directly as functions of temperature up to 1000°C. The critical temperature for the glass and polypropylene fibre reinforced cement composite when most properties are worsening in a significant way is found apparently 500°C.
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Ridwan, Muhammad, Hu Liang Jun, and Isamu Yoshitake. "Effect of polypropylene fibers on high strength mortar subjected to elevated temperature." E3S Web of Conferences 156 (2020): 05010. http://dx.doi.org/10.1051/e3sconf/202015605010.

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This study focuses on the thermo-mechanical properties of mortar in the retrofitting cover of additional reinforcement for existing concrete structures. In addition, the residual mechanical properties of high strength mortar incorporating polypropylene fibers subjected to the effect of fiber length and the elevated temperature were investigated. Several experiments were conducted to determine the optimum mixture proportions of high strength mortar incorporating polypropylene fibers which had a slump-flow of 25–30 cm, compressive strength of 50 MPa or higher, and flexural strength of 4–8 MPa. Subsequently, an experiment was conducted by using high-strength mortar-blended polypropylene fibers with a length of 2 cm, and the ratio of fiber length to the diameter of cylinder mortar-specimens was 0.4. The experimental parameters were the weight volume of fibers (0 %, 0.5 %, 1 %, and 2%) and the heating temperature (100, 200 and 300 °C). The effect of the mixing parameters, including polypropylene length on compressive strength, slump-flow and the flexural strength of mortar were discussed. It is evident that fiber in the mortar cover influenced the initial and residual mechanical properties, such as elasticity, compressive strength, and Poisson’s ratio, of the mortar.
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Huang, Jun, Denis Rodrigue, and Ling Dong. "Effect of Temperature on the Viscoelastic Properties of Carbon Nanotube Reinforced Polypropylene Composites." Advances in Materials Science and Engineering 2021 (April 24, 2021): 1–12. http://dx.doi.org/10.1155/2021/6630408.

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Finite element method (FEM) is used to analyze the mechanical properties of carbon nanotubes (CNTs) reinforced polypropylene (PP) composites. Firstly, polypropylene is assumed as a viscoelastic material, while carbon nanotubes are assumed as linear elastic materials to study the effect of temperature on the mechanical properties of neat PP and CNT/PP nanocomposites. Secondly, to compare the viscoelastic properties of neat PP and CNT/PP nanocomposites, the relaxation time at a specific temperature is used to investigate the relaxation of the nanocomposites for fixed tensile displacements. Thirdly, the effect of CNT volume fraction on the viscoelastic properties of nanocomposites is studied at different temperatures. Finally, to better understand the stress distribution along the CNT axial direction, a single carbon nanotube is isolated in the matrix to compare the stress distribution with nonisolated CNTs.
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Більше джерел

Дисертації з теми "Polypropylene Effect of temperature on"

1

Snyder, Joseph Timothy II. "The effect of compressive biaxial orientation on the low-temperature toughness and pre-fracture damage of polypropylene." Case Western Reserve University School of Graduate Studies / OhioLINK, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=case1056558280.

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2

Guclu, Mehmet. "Light Stability And The Effect Of Temperature On Mechanical Properties Of Polypropylene / Poly(ethylene-vinyl-acetate) Blends." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608535/index.pdf.

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The variation in properties of Polypropylene (PP) / Ethylene Vinyl Acetate (EVA) blends upon EVA content, temperature, and light stability were followed by using tensile testing, impact testing, and differential scanning calorimetry (DSC). Young&rsquo
s modulus of the blends decreased with increasing drawing temperature and EVA content. The stress at break values of the blends slightly increased with EVA whereas decreased with drawing temperature. The percent strain at break values of the blends were found to increase abruptly by increasing EVA content and drawing temperature. These changes in the mechanical properties are the indication of compatibility. The impact tests were performed only at 0°
C, 25°
C and the impact strength increased with the temperature and EVA content, but none of the samples were broken at higher testing temperatures. The effect of stabilizer was very obvious because stabilizer-free samples failed after 400 hours whereas, the samples with stabilizer resisted up to 750 hours. Elongation values of the samples decreased because of increasing brittleness by UV irradiation. We also observed chain stiffening effect by crosslinking in all samples upon UV irradiation. Thermal analysis of the blends of the drawn samples showed an increasing trend of crsytallinity with increasing drawing temperature. Increasing drawing temperature made polymer chains more flexible because of the increasing chain mobility. These flexible chains were then oriented in one direction during tensile testing and therefore uniaxial crystallization occurred. The morphology of impact and tensile tests samples were also analyzed by scanning electron microscope (SEM). The fibrillation of pure PP is higher than the fibrillation of the blends.
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3

Hayakawa, N., T. Kobayashi, M. Hazeyama, T. Takahashi, K. Yasuda, and H. Okubo. "Partial discharge inception characteristics of LN/sub 2//polypropylene laminated paper composite insulation system for high temperature superconducting cables." IEEE, 2005. http://hdl.handle.net/2237/6846.

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4

Mansour, Marwan. "Experimental tests on the effect of temperature on the short term behavior of FRC beams." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Анотація:
The effect of temperature under short term behavior on macro-synthetic polypropylene fibers reinforced concrete (MSFRC) was evaluated, to understand how this condition may affect the performance of this material. An experimental campaign of three-point bending, compressive tests and elastic modulus tests have been performed on prisms, cubes and cylinders cured at 6 temperatures, ranging from -30°C to +60°C. The results highlighted that, for the material tested, the increment of temperature causes a decrement of the peak and post-peak flexural strength. Further analysis have been done on the fibers number and failure type.
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5

Magagula, Sifiso Innocent. "The effect of organic peroxides on the molecular composition of heterophasic ethylene-propylene impact copolymers." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97850.

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Thesis (MSc)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: Heterophasic ethylene-propylene copolymers, also known as impact polypropylene (PP) copolymers (IPCs) or heterophasic copolymers (HECOs), are a unique group of polyolefins produced through the copolymerisation of ethylene and propylene, with the aim of improving the impact properties of the PP homopolymer at low temperatures. Therefore, this polymer comprises of a PP homopolymer matrix with a dispersed rubbery copolymer phase. Due to their unique properties, HECO polymers have become commercially important materials, with a wide range of applications. Therefore a fundamental understanding of the processes and chemistry that affects their final macroscopic properties needs to be expanded. The main focus of this investigation was to understand why specific organic peroxides influence or interact differently with the various phases of HECO polymers, in order to utilize their properties to obtain HECO polymers with optimal and desired properties. Two HECO polymers with different ethylene contents were fractionated into three fractions (30, 100 and 130 °C), using preparative temperature rising elution fractionation (P-TREF). Each individual TREF fraction was degraded with two different types of organic peroxides, and then characterised using four different analytical tools. The changes in the molecular structures of the different fractions were investigated by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The changes in comonomer sequence distributions were investigated by carbon 13 nuclear magnetic resonance spectroscopy (13C-NMR). Moreover, the degradation of the different fractions was investigated by high temperature size exclusion chromatography (HT-SEC). The investigation showed that the HECO polymers with different ethylene contents were uniquely altered. It was evident that the ethylene content influenced the degradation behaviour of the HECO polymers. The ability of the peroxide to affect certain regions of the HECO polymer more than others is highly dependent upon its miscibility with certain regions of the HECO polymers. The “visbreaking” efficiency of a specific organic peroxide appears to be primarily dependent on the number of “peroxy” groups it contains in its molecular structure. Stellenbosch University https://scholar.sun.ac.za
AFRIKAANSE OPSOMMING: Heterofase etileen-propileen ko-polimere, ook bekend as impak PP ko-polimere (IPCS) of heterofase ko-polimere (HECO), is 'n unieke groep poliolefiene geproduseer deur die ko-polimerisasie van etileen en propileen, met die doel op die verbetering in die impak eienskappe van die PP homopolimeer by lae temperature. Hierdie polimeer bestaan dus uit 'n PP homopolimeer matriks met 'n verspreide rubberagtige ko-polimeer fase. As gevolg van hul unieke eienskappe, is HECO polimere van kommersiële belang, met 'n wye verskeidenheid van toepassings. 'n Fundamentele begrip van die prosesse en chemie wat die finale makroskopiese eienskappe beïnvloed moet dus uitgebrei word. Die hooffokus van hierdie ondersoek was om te verstaan waarom spesifieke organiese peroksiede verskillende invloede en interaksies met die verskillende fases van HECO polimere het, om sodoende van hul eienskappe gebruik te maak om HECO polimere te verkry met optimale en gewenste eienskappe. Twee HECO polimere met verskillende etileen inhoud was gefraksioneer in drie fraksies (30, 100 en 130 °C), met behulp van preparatiewe temperatuur styging eluering fraksionering (P-TREF). Elke individuele TREF fraksie was gedegradeer met twee verskillende tipes organiese peroksiede en daarna gekarakteriseer deur vier verskillende analitiese metodes. Die veranderinge in molekulêre strukture van die verskillende fraksies was geondersoek met behulp van Fourier transform infrarooi spektroskopie (FTIR) en differensiële skandering kalorimetrie (DSC). Die veranderinge in ko-monomeer volgorde distribusie was bestudeer deur middel van kern magnetiese resonans spektroskopie (KMR). Verder was die degradasie van die verskillende fraksies met behulp van hoë temperatuur grootte uitsluitingschromatografie (HT-SEC) bestudeer. Die ondersoek het getoon dat die HECO polimere met verskillende etileen inhoud uniek gedegradeer was. Dus is dit duidelik genoeg dat die etileen inhoud die degradasie gedrag van die HECO polimere beïnvloed het. Die vermoë van die peroksied om sekere areas van die HECO polimeer meer as ander te beïnvloed is hoogs afhanklik van die mengbaarheid met sekere areas van die HECO polimere. Die "visbreking" doeltreffendheid van 'n spesifieke organiese peroksiede is meestal afhanklik van die aantal "peroksie" groepe in die molekulêre struktuur.
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6

Nguyen, Duy Cuong. "Caractérisation de l'interface fibre/matrice : application aux composites polypropylène/chanvre." Thesis, Troyes, 2016. http://www.theses.fr/2016TROY0009/document.

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Les agro-composites font l'objet de nombreuses études et applications industrielles en raison des multiples propriétés mécaniques qu'ils présentent. Ces propriétés présentent de grandes perspectives comparées à celles des composites traditionnels. Cependant les connaissances sur le comportement mécanique de l'interface fibre/matrice restent limitées. De plus, la différence de propriété entre la fibre hydrophile et la matrice hydrophobe peut causer des défauts au niveau de l’interface. Il est donc important de caractériser finement la décohésion à l'interface au cours d'une sollicitation. Plusieurs méthodes ont été proposées dans la littérature, elles sont généralement très complexes à mettre en œuvre et sont coûteuses. Dans cette étude, nous avons développé une méthode de caractérisation en se basant sur l'essai de « pull-out ». La géométrie de la fibre a été prise en compte dans le calcul des propriétés mécaniques de l'interface par la mise à profit d'une approche inspirée de la tomographie. L'influence de la température d'élaboration sur les propriétés mécaniques de l'interface a été étudiée de manière à définir la température optimale. L'évolution des propriétés interfaciales a été suivie au cours d'un vieillissement en humidité relative. Après quatre semaines, la résistance au cisaillement et la rigidité au cisaillement de l'interface sont diminuées fortement alors que la déformation à la rupture est augmentée
Agro-composites are increasingly studied and applied to various industries over recent years due to good mechanical properties compared to conventional composites especially in terms of specific values. However, since low adhesion between the hydrophilic fiber and hydrophobic matrix, which occurs one of the main breaks modes in this kind of material, the characterization of the interface becomes a key problem. For investigation of this issue, existing methods show limitation for reasons of complexity (in preparation, in principle) and of cost. In this study, we developed a « pull-out ». In particular, the real fiber geometry of the plant fiber was taken into the calculation of mechanical properties of interface using a tomography inspired method. By checking the effective temperature of the molding then varying it, we studied the effect of this processing parameter to mechanical properties of fibre/matrix interface and determined the optimal conditions. The developed experimental protocol is applied to aged interfaces in order to clarifying the evolution of interfacial properties during the aging time to relative humidity. After four weeks, the interfacial shear strength and the shear modulus of the interface were greatly reduced while the shear deformation at the rupture was greatly increased
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Jones, Andrew Paul. "Novel approaches to high temperature stabilisation of polypropylene." Thesis, Manchester Metropolitan University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545931.

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8

Schildmeyer, Andrew Joseph. "Temperature and time dependent behaviors of a wood-polypropylene composite." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Summer2006/a%5Fschildmeyer%5F072006.pdf.

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9

Moeiri-Farsi, M. H. "Effects of autoclave temperatures on properties of cementitious based matrices reinforced with randomly orientated polypropylene fibres." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336075.

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Haniche, Rachid. "Contribution à l’étude des bétons portés en température / Evolution des propriétés de transfert : Etude de l’éclatement." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0155/document.

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Анотація:
L’étude du comportement des bétons à hautes températures est d’une grande importance pour déterminer la stabilité et la résistance des structures en béton en situation d’incendie. Des incendies spectaculaires, ces dernières années, ont montré que le béton pouvait être très fortement sollicité. Ainsi il apparaît qu’assurer un très bon comportement du béton en température permet de sauver des vies et de diminuer les frais d'immobilisation et de réparation des structures endommagées. Le travail présenté vise, par une étude expérimentale, à apporter une meilleure compréhension des phénomènes mis en jeu lors de l’exposition aux hautes températures des bétons à hautes performances (BHP). Il s’intéresse, plus particulièrement, aux transferts des fluides dans les bétons (perméabilité) et à l’étude de l’instabilité thermique (phénomène d’éclatement) des bétons à hautes performances. Le travail de thèse a été mené sur des bétons à hautes performances (80 MPa) avec 5% de fumée de silice (matériau à faible perméabilité pour améliorer la durabilité), et différents pourcentages de fibres de polypropylène. L’utilisation des fibres de polypropylène (PP) est considérée comme une solution technique efficace pour améliorer la tenue au feu des bétons à hautes performances, notamment grâce aux phénomènes physiques apparaissant aux températures inférieures à 200°C. Notre travail concerne, dans un premier temps, la caractérisation de l’évolution des propriétés physiques (porosité, perte de masse), thermiques (conductivité et diffusivité) et mécaniques (résistance à la compression et en traction) ainsi que les isothermes de sorption. La deuxième partie de ce travail concerne l’étude de l’évolution de la perméabilité en fonction de la température (jusqu’à 200°C), principale propriété caractérisant les transferts hydriques au sein des bétons. Les paramètres étudiés sont : le type de béton (avec ou sans fibres de PP), deux types de fibre de géométries différentes, la nature du fluide (air ou vapeur d’eau) et la méthode de mesure (en résiduel et à chaud). Les résultats expérimentaux montrent que les fibres génèrent une perméabilité plus importante au-delà de 150°C et que les valeurs obtenues en résiduel ou à chaud peuvent être liés aux modes opératoires. Enfin, dans la dernière partie une investigation sur le phénomène d’éclatement explosif en lien avec la composition du matériau est menée. Une nouvelle méthode d’investigation expérimentale de la sensibilité des formulations à l’instabilité thermique est proposée avec une étude sur des sphères portées en température. Cette méthode devra être comparée aux méthodes traditionnelles d’investigation. L’analyse des résultats des essais permet de discuter sur les causes de l’instabilité thermique et de caractériser les propriétés du béton en température, données indispensables à la modélisation
The study of the behaviour of concrete at high temperatures is of great importance to determine the stability and strength of concrete structures in fire conditions. Spectacular fires, these last years, showed that the concrete could be very strongly solicited. Thus it appears that to ensure a very good behaviour of the concrete at temperature it is saved people and reduced the expenses of immobilisation and repair of the damaged structures. The aims of the present work, by the experimental study, are to provide a better comprehension of the involved phenomena during the exposure to the high temperatures of the high performance concretes (HPC). It focuses, in particular, on the fluids transfers (permeability) and the study of the thermal instability (spalling) of high performance concrete. The thesis work was conducted on high-performance concrete (80 MPa) with 5% silica fume (low permeability material to improve durability), and different amount of polypropylene fibres. The use of polypropylene fibres (PP) is regarded as an effective technical solution to improve the behaviour of the HPC at fire conditions, in particular thanks to the physical phenomena appearing at the temperatures lower than 200°C. Our work is concerned, initially, on the characterization of the evolution of physical properties (porosity, mass loss), thermal properties (conductivity and diffusivity) and mechanical properties (compressive strength and tensile) and the sorption isotherms. The second part concerns the study of the evolution of the permeability, as a main property characterising the hydrous transfers inside the concrete exposed to temperature. An experimental study is conducted concerning the evolution of the permeability of concrete as a function of temperature (up to 200 ° C). The studied parameters are: the type of concrete (with and without fibres), two types and geometry of fibres, the nature of the fluid (air and vapour) and the measurement methods (residual and under temperature). The experimental results shows that the existing fibres generate a most important permeability beyond 150°C and that the obtained results, by residual or under temperature measurements, may be related to the operating procedures. Finally, in the last part an investigation on the spalling phenomenon related to the material compositions is conducted. A new experimental method of investigation of the sensitivity of the formulations to thermal instability is proposed: the study of spherical specimens exposed in high temperatures. This method will be compared to the traditional methods of investigation. The analysis of the test results makes to discuss the thermal instability causes and to characterize the concrete properties at high temperatures, important data to modelling
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Книги з теми "Polypropylene Effect of temperature on"

1

Moeiri-Farsi, M. H. Effects of autoclave temperatures on properties of cementitious based matrices reinforced with randomly orientated polypropylene fibres. Salford: University of Salford, 1993.

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2

Harań, Grzegorz. Impurity effect in high temperature superconductors. Wrocław: Oficyna Wydawnicza Politechniki Wrocławskiej, 2001.

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3

Franklin, Keara A., and Philip A. Wigge. Temperature and plant development. Ames, Iowa USA: Wiley Blackwell, 2014.

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4

Lansdown, A. R. High temperature lubrication. London: Mechanical Engineering Publications, 1994.

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5

E, Lee Richard, and Denlinger David L, eds. Insects at low temperature. New York: Chapman and Hall, 1991.

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6

Trollip, N. G. A review of the effect of impurities on the photostability of polypropylene. Port Elizabeth: SAWTRI, 1985.

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7

Lufitha, Mundel. Effect of substrate temperature on coating adhesion. Ottawa: National Library of Canada, 2001.

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8

High temperature corrosion. London: Elsevier Applied Science, 1988.

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9

DeHayes, D. H. Critical temperature: A quantitative method of assessing cold tolerance. Broomall, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1989.

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DeHayes, D. H. Critical temperature: A quantitative method of assessing cold tolerance. Broomall, PA: U.S. Dept. of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1989.

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Частини книг з теми "Polypropylene Effect of temperature on"

1

Li, Guiqin, Junjie Li, Jun Wang, Jiemin Feng, Qing Guo, Junlong Zhou, and Peter Mitrouchev. "The Effect of Temperature on Mechanical Properties of Polypropylene." In Lecture Notes in Electrical Engineering, 143–49. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5768-7_14.

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2

Hugo, J., M. Housková, and V. Matĕna. "Thermoelastic Effect of "Polypropylene - CaCO3" Composites. The Influence of the Composition, Rate of Strain and Temperature." In Polymer Composites, edited by Blahoslav Sedlácek, 217–24. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110856934-017.

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3

Marques, Severino P. C., and Guillermo J. Creus. "Temperature Effect." In Computational Viscoelasticity, 51–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25311-9_6.

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4

Zhang, Guigen. "Temperature Effect." In Bulk and Surface Acoustic Waves, 257–71. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003256625-7.

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5

Alderliesten, René. "Effect of Temperature." In Fatigue and Fracture of Fibre Metal Laminates, 253–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56227-8_11.

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Brown, R. P. "Effect of temperature." In Physical Testing of Rubber, 235–58. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-0529-3_15.

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Brown, Roger. "Effect of Temperature." In Physical Test Methods for Elastomers, 305–31. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66727-0_21.

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Ferrell, Richard A. "The Josephson Effect." In High Temperature Superconductivity, 60–83. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4612-3222-3_3.

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9

Oka, Yoshiaki. "Temperature Effect of Reactivity." In Nuclear Reactor Kinetics and Plant Control, 23–33. Tokyo: Springer Japan, 2012. http://dx.doi.org/10.1007/978-4-431-54195-0_3.

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Wen, Shengmin. "Temperature Effect on Fatigue." In Encyclopedia of Tribology, 3538–40. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_281.

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Тези доповідей конференцій з теми "Polypropylene Effect of temperature on"

1

Holto, Jorunn, and Oystein Hestad. "Field and temperature dependent conductivity of syndiotactic polypropylene effect of temperature and electric field." In 2014 IEEE Electrical Insulation Conference (EIC). IEEE, 2014. http://dx.doi.org/10.1109/eic.2014.6869341.

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2

Aakre, Torstein G., Oystein L. Hestad, Jorunn Holto, and Sverre Hvidsten. "The effect of temperature cycling on mechanical and electrical properties of syndiotactic polypropylene." In 2016 IEEE International Conference on Dielectrics (ICD). IEEE, 2016. http://dx.doi.org/10.1109/icd.2016.7547809.

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3

Zhu, L. W., B. X. Du, J. Li, T. Han, Z. L. Li, and J. G. Su. "Effect of High Temperature on Electrical Treeing of Polypropylene with Repetitive Pulse Voltage." In 2018 IEEE 2nd International Conference on Dielectrics (ICD). IEEE, 2018. http://dx.doi.org/10.1109/icd.2018.8468446.

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4

Zhu, L. W., B. X. Du, J. Li, T. Han, Z. L. Li, and J. G. Su. "Effect of High Temperature on Electrical Treeing of Polypropylene with Repetitive Pulse Voltage." In 2018 IEEE 2nd International Conference on Dielectrics (ICD). IEEE, 2018. http://dx.doi.org/10.1109/icd.2018.8514745.

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5

Bayar, Selen, Feridun Delale, and Benjamin Liaw. "Temperature Effect on Low Velocity Impact of Nanoclay Reinforced Polymers." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88200.

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Анотація:
The main objective of this study is to ascertain the effect of temperature on nanoclay reinforced polymers subjected to low velocity impact loads. Most of the studies for low velocity drop weight tests are on fiber or fabric reinforced polymers. In recent years nanoadditives such as nanoclay have been used to improve the fire retardation of composites. The low velocity drop weight testing undertaken under this research has the distinct goal of obtaining base line data for impact analysis of nanoclay reinforced polymers. First, polypropylene 3371 (PP) resin specimens with dimensions of 4″×4″×(1/8)″ reinforced with varying weight fractions of nanoclay (0%, 0.2%, 1%, 3%, 6% and 10%) and instrumented with strain gages were subjected to low velocity impact tests. The low velocity impact tests were carried out at an energy level appropriate for nanoadditive reinforced polymers and at various temperatures, from −65°F (−54°C) to 160°F (71°C). The variation of contact force, specimen deflection and energy imparted to the specimen with time and the variation of contact force with displacement were obtained at each temperature. Depending on the drop height, the weight used and the percentage of nanoclay reinforcement, the following was observed: some specimens were penetrated (P), some cracked (F) and some visually remained virtually intact (NP), that is, they were not penetrated. The results of the low velocity impact tests indicate that high temperatures affect polypropylene significantly and practically eliminate the effect of nanoclay reinforcement. As a consequence the specimens show ductile behavior and were not penetrated. However, at room and low temperatures the effect of nanoclay reinforcement is discernable and addition of nanoclay makes the specimens more brittle, resulting in penetration of most of them.
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6

Taheri, Hesam, João Miguel Nóbrega, Pieter Samyn, and José Antonio Covas. "The effect of temperature and drawing ratio on the mechanical properties of polypropylene monofilaments." In PROCEEDINGS OF PPS-29: The 29th International Conference of the Polymer Processing Society - Conference Papers. American Institute of Physics, 2014. http://dx.doi.org/10.1063/1.4873739.

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7

Santoso, Henry, Andrea Cavallini, and Suwarno. "The Effect of Nanofiller And Temperature on Dielectric Properties of Polypropylene-Based Dielectric Material." In 2020 IEEE International Conference on Power and Energy (PECon). IEEE, 2020. http://dx.doi.org/10.1109/pecon48942.2020.9314466.

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8

Xiao, Meng, Y. N. Song, and B. X. Du. "Effect of Gamma Radiation on the High-temperature Breakdown Strength of Polypropylene Films for Capacitors." In 2022 IEEE 4th International Conference on Dielectrics (ICD). IEEE, 2022. http://dx.doi.org/10.1109/icd53806.2022.9863462.

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9

Zhang, Chuyan, and Huseyin R. Hiziroglu. "Effect of Electric Field and Temperature on the Behavior of Polypropylene Filled with Nanometric Natural Clay." In 2019 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2019. http://dx.doi.org/10.1109/ceidp47102.2019.9009616.

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Zhang, Ling, Wangsong Wu, Yuxuan Xu, and Yuanxiang Zhou. "Effect of Annealing Rate on Low-Temperature Impact Strength and Space Charge Characteristics of Isotactic Polypropylene." In 2021 IEEE Electrical Insulation Conference (EIC). IEEE, 2021. http://dx.doi.org/10.1109/eic49891.2021.9612395.

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Звіти організацій з теми "Polypropylene Effect of temperature on"

1

Kawahara, W. A., J. J. Totten, and J. S. Korellis. Effects of temperature and strain rate on the nonlinear compressive mechanical behavior of polypropylene. Office of Scientific and Technical Information (OSTI), May 1989. http://dx.doi.org/10.2172/6261053.

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2

Stanciulescu, M., and H. Seoud. Effect of polyethylene, polypropylene and polystyrene on coke suppression during the thermal cracking of bitumen and heavy oils. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1993. http://dx.doi.org/10.4095/304574.

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3

Sawatzky, H., I. Clelland, and J. Houde. Effect of topping temperature on Cold Lake asphalt's susceptibility to temperature. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/304486.

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4

Cheng, Juei-Teng, and Lowell E. Wenger. Josephson Effect Research in High-Temperature Superconductors. Fort Belvoir, VA: Defense Technical Information Center, August 1988. http://dx.doi.org/10.21236/ada201483.

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5

Korinko, P. EFFECT OF FILTER TEMPERATURE ON TRAPPING ZINC VAPOR. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1025512.

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6

Sun, W. D., Fred H. Pollak, Patrick A. Folkes, and Godfrey A. Gumbs. Band-Bending Effect of Low-Temperature GaAs on a Pseudomorphic Modulation-Doped Field-Effect Transistor. Fort Belvoir, VA: Defense Technical Information Center, March 1999. http://dx.doi.org/10.21236/ada361412.

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Price, J. T., J. F. Gransden, M. A. Khan, and B. D. Ryan. Effect of selected minerals on high temperature properties of coke. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/304533.

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Farkas, Z. Effect of Sled Cavity Temperature Changes on Effective Accelerating Field. Office of Scientific and Technical Information (OSTI), May 2006. http://dx.doi.org/10.2172/882199.

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HYUN, Hye-Ja, and In-Ho HWANG. Investigation of Tidal Effect Using Simultaneous Temperature Logging in Boreholes. Cogeo@oeaw-giscience, September 2011. http://dx.doi.org/10.5242/iamg.2011.0049.

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Mazzaro, Gregory J., Gregory D. Smith, Getachew Kirose, and Kelly D. Sherbondy. Effect of Cold Temperature on the Dielectric Constant of Soil. Fort Belvoir, VA: Defense Technical Information Center, April 2012. http://dx.doi.org/10.21236/ada561950.

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