共查询到19条相似文献,搜索用时 109 毫秒
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采胳悬浮共聚的方法研制了偏氯乙烯/氯乙烯(VCD/VC)共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度等对VDC/VC共聚树脂的影响。 相似文献
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采用悬浮共聚的方法研制了偏氯乙烯/丙烯酸甲酯(VDC/MA)共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度对VDC/MA共聚树脂的影响。结果表明,当VDC/MA=(92-96)/(8-4)、采用分散剂B(用量0.13%)、搅拌速度300-400r/min,并根据聚合温度调节分子量大小,制得的VDC/MA共聚树脂其膜光泽好、透时度高,热稳定性好。 相似文献
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氯乙烯/偏氯乙烯共聚树脂及膜系列的开发 总被引:1,自引:0,他引:1
综述了氯乙烯/偏氯乙烯共聚树脂(PVDC树脂)及膜的系列新牌号的组成、配方以及利用共混、共聚等手段改进PVDC树脂及膜性能的方法。 相似文献
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通过DSC测试及HAAKE流变测试,对偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的组成及聚合温度对其加工性能、熔融温度、结晶度性能的影响进行了研究,进而对树脂的结晶结构进行了探讨,为工业控制树脂的合成条件提供依据。 相似文献
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叙述了乳液聚合技术的发展历程及共聚乳液的反应机制,介绍了氯乙烯-偏氯乙烯共聚乳液的基础配方及生产方法,指出影响乳液质量的关键因素是单体质量、乳化剂质量及其配比。 相似文献
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Minimum film-formation temperature (MFFT) of vinylidene chloride (VDC)-methyl acrylate (MA) copolymer latexes prepared by batch emulsion polymerization with various compositions from 20 to 97 wt % of VDC were measured. For latexes with VDC content below 90 wt %, MFFT was similar to polymer Tg. As VDC content increased beyond 90 wt %, the MFFT curve plotted against VDC content rose sharply, in contrast with the Tg curve that descended smoothly. Measurements of infrared absorption of latexes in the dispersed state, and X-ray diffraction and infrared absorption of lyophilized polymers were conducted on 40 : 60, 80 : 20, and 95 : 5 VDC-MA specimens. These observations indicated that only 95 : 5 VDC-MA specimens were highly crystalline. It was therefore believed that film-formation property of latex with high VDC content was significantly affected by polymer crystallinity of particles in the dispersed state. Morphology and oxygen gas transmission rate of heat-treated and non-heat-treated coatings of 95 : 5 VDC-MA latex were investigated. Heat treatment of coatings beyond the temperature at which crystalline polymer began to melt induced effective particle coalescence, resulting in reduced oxygen gas transmission rate. This supported our belief that film-formation property of VDC-MA latex with high VDC content was significantly affected by polymer crystallinity. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 565–572, 1998 相似文献
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介绍了偏二氯乙烯共聚树脂的性能,主要技术路线与最佳的操作条件及进展情况.对现工业化运行的生产工艺的技术特点进行了分析和总结.阐述了国内外研究开发的现状与发展趋势.探讨了应用前景与市场需求. 相似文献
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A copolymer of vinylidene chloride and vinyl chloride containing 13.5% by weight of the latter has been solution blended with four aliphatic polyesters: poly(?-caprolactone), poly(2,2-dimethyl-1,3-propylene adipate), poly(1,4-cyclohexanedimethylene succinate), and poly(2,2-dimethyl-1,3-propylene succinate). Each blend was examined visually and by differential scanning calorimetry. All blends with the copolymer form a single miscible amorphous phase at all compositions and all temperatures except for the latter mentioned polyester, which exhibits liquid–liquid phase separation at temperatures above a measured cloud point curve. Information about interactions between the components in each blend is estimated from melting point data and discussed. 相似文献
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Copolymers of vinylidene chloride, SARAN* resins, can be fabricated into films which have excellent barrier to mass transport. They are useful for making packages which must keep oxygen out or prevent moisture from entering or leaving. The oxygen barrier properties of SARAN films have been recently published (8). The purpose of this paper is to describe the moisture barrier properties of SARAN films as functions of temperature, humidity, and film composition. This information will aid packaging engineers design better barrier packaging. 相似文献
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Phase behavior of blends of aliphatic polyesters with a vinylidene chloride/vinyl chloride copolymer
A series of aliphatic polyesters having CH2/COO ratios from 2 to 14 in their repeat units were blended with a copolymer of vinylidene chloride containing 13.5% by weight of vinyl chloride. Blends of polyesters having CH2/COO < 4 did not form completely miscible amorphous phases, whereas polyesters having CH2/COO ≥ 4 did form completely homogeneous amorphous phases for all temperatures below the decomposition point except for the polyester with CH2/COO = 14 which showed reversible phase separation on heating, i.e., lower critical solution temperature behavior. Interaction parameters were estimated by melting point depression and by analog calorimetry. The behavior reported here is qualitatively similar to that reported earlier for blends of aliphatic polyesters with poly(vinyl chloride), polyepichlorohydrin, polycarbonate, styrene–allyl alcohol copolymers, and the hydroxy ether of bisphenol A. 相似文献
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Vinylidene chloride (VDC)–butyl methacrylate (BMA) copolymer latex films of various compositions (83 : 17, 60 : 40, 33 : 67 in mol %), prepared by batch and semicontinuous processes, were investigated for their physical properties by infrared spectroscopy, 13C solidstate NMR spectroscopy, X-ray diffraction, solubility in various solvents, differential scanning calorimetry (DSC), and water vapor transmission rates (WVTR), and for their mechanical properties by dynamic mechanical spectroscopy (DMS), and tensile strength measurements. Semicontinuous latex films were found to be homogeneous in composition and amorphous in character. On the other hand, batch latex films containing high VDC monomer content were heterogeneous in composition and crystalline in character. These differences were found to reflect the effect of mode of monomer addition during the emulsion polymerization process, and correlated well to the results on kinetics, colloidal, and surface properties of the VDC-BMA copolymer latexes, as described in the first part of this study. 相似文献
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Phillip T. Delassus 《乙烯基与添加剂工艺杂志》1981,3(4):240-245
Copolymers of vinylidene chloride can be fabricated into films that have excellent barriers to carbon-dioxide transparent. To retain the maximum barrier, liquid additives should not be used. Since the carbon dioxide barrier properties of different polymers have different temperature sensitivities, you must compare properties at the temperature of intended use. 相似文献