偏氯乙烯－氯乙烯悬浮共聚树脂的研制研究

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。     

偏氯乙烯共聚树脂水胶乳涂料

介绍了各种偏氯乙烯共聚树脂水胶乳涂料的制备工艺,讨论了影响其使用性能的因素     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的研制

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。     

氯乙烯/偏氯乙烯共聚树脂及膜系列的开发

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。     

偏二氯乙烯-丙烯腈悬浮共聚动力学

研究了单体配比、引发剂浓度、聚合温度、转化率等因素对偏二氯乙烯(VDC)-丙烯腈(AN)悬浮共聚树脂的组成、相对分子质量和聚合速率的影响,建立了动力学模型,讨论了AN的水溶性对树脂组成的影响,提出了相对分子质量与聚合温度及引发剂浓度关系的模型。     

三元偏氯乙烯/丙烯腈/苯乙烯悬浮共聚树脂的合成

以偶氨二异丁腈（ＡＩＢＮ）作引发剂,合成了偏氯乙烯（ＶＤＣ）／丙烯腈（ＡＮ）／苯乙烯（Ｓｔ）三元悬浮共聚树脂。在聚合过程中,压力先逐步升高后下降。当悬浮聚合质量投料比为６０：１５：２５（ＶＣＤ／ＡＮ／Ｓｔ）时,其压力转变点的转化率约为５５％～６５％。聚合得到的三元ＶＤＣ－ＡＮ－Ｓｔ悬浮共聚树脂为球形半透明颗粒,重均粒径约为５０．５６μｍ。合成的悬浮液中存在数量较多的微小粒子,加入ＮａＮＯ２可减少其     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂颗粒特性

对悬浮聚合聚偏氯乙烯和偏氯乙烯-丙烯酸甲酯（VDC—MA）共聚树脂的颗粒形貌和孔径分布进行了研究。发现不同MA含量的树脂基本呈规整球形,颗粒内部初级粒子聚集程度随MA含量增加而增加,孔隙率降低;当MA的质量分数为树脂的0～5％量,树脂颗粒内部存在孔径为0．1～1．0μm的孔隙;当MA的质量分数为10％时,以上尺寸的内部孔隙很少;当MA的质量分数为10％时,树脂无内部孔隙;这与聚合物结晶性随MA含量增加而降低．单体在聚合物中的溶胀能力增加有关。     

偏氯乙烯—丙烯酸甲酯浮共聚树脂组成及聚合温度与性能的关系

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。     

氯乙烯-偏氯乙烯共聚乳液的生产与应用

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。     

偏氯乙烯共聚树脂的制备与应用进展

本文对偏乙烯共聚树脂的发展史进行了回顾,着重介绍了ＶＤＣ共聚树脂的新品种－发泡ＶＤＣ共聚树脂的制备和应用。     

Effect of vinylidene chloride content on film-formation property of vinylidene chloride-methyl acrylate copolymer latex

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 T_g. As VDC content increased beyond 90 wt %, the MFFT curve plotted against VDC content rose sharply, in contrast with the T_g 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     

偏二氯乙烯共聚树脂的开发与应用

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.     

偏氯乙烯-氯乙烯悬浮共聚树脂的颗粒特性

在5L聚合釜中制备了偏氯乙烯(VDC)一氯乙烯(VC)共聚树脂,研究了起始搅拌转速、分散剂配比、水油比和助剂对共聚树脂颗粒特性的影响。实验结果表明,随着起始搅拌转速的增加,树脂粒径增大,而粒径分布变宽;增加复合分散剂中纤维素醚K的配比,树脂的平均粒径增大;增加水油比,树脂颗粒的粒径变小,分布变窄;聚合前加入助剂环氧大豆油(ESO)对树脂颗粒的粒径及分布影响不大。本实验制备的树脂颗粒形态规整,与日本同类产品相近。     

Miscible blends of a vinylidene chloride/vinyl chloride copolymer with aliphatic polyesters

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.     

Factors affecting the moisture barrier of vinylidene chloride-vinyl chloride copolymer films

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.     

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.     

Batch and semicontinuous emulsion copolymerization of vinylidene chloride and butyl methacrylate. II. Physical and mechanical properties of copolymer latex films

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.     

Factors affecting the carbon dioxide barrier of vinylidene chloride-vinyl chloride copolymer films

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.