偏二氯乙烯-氯乙烯共聚树脂的阻隔性

介绍了聚偏二氯乙烯-氯乙烯（VDC—VC）共聚树脂的阻隔特性及原理,分析了聚合过程、添加剂配方、成型加工工艺等对PVDC阻隔性能的影响。认为采用综合改进措施可以获得阻隔性能优异的PVDC制品。PVDC共聚树脂的未来发展将以多层共挤树脂为方向。     

氯乙烯-丙烯酸异辛酯共聚树脂的合成与表征

通过连续滴加预乳化丙烯酸异辛酯(EHA)单体,采用悬浮聚合方法合成了氯乙烯(VC)/EHA共聚树脂,对共聚树脂的颗粒特性、加工性能和力学性能等进行了研究。随着单体配比[m(EHA)∶m(VC)]的增加,共聚树脂颗粒的孔隙率、增塑剂吸收量和玻璃化温度降低,塑化时间和转矩缩短,加工性能逐渐变好,加工试片的硬度和拉伸强度降低,冲击强度略增大。     

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—氯乙烯悬浮共聚树脂特性粘数的单点法测定

本文针对高偏氯乙烯(VDC)含量的偏氯乙烯—氯乙烯(VC)悬浮共聚树脂特性粘数单点法测试问题,比较了Solomon—Ciuta、Maron、Rao等公式计算误差,确定了VDC/VC重量配比85/15所得树脂特性粘数的测试方法。该方法可在VDC—VC共聚树脂的质量检验中使用。     

连续加料工艺对氯乙烯-醋酸乙烯酯共聚树脂性能的影响

对比了采用氯乙烯连续加料和一次性加料工艺生产的氯乙烯-醋酸乙烯酯共聚树脂(简称氯醋树脂)的质量和加工性能,结果表明:采用连续加料工艺生产的氯醋树脂的化学组成均匀,溶解性能和加工性能得到提高。     

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—甲基丙烯酸环氧丙酯共聚树脂的合成及其性能

采用甲基丙烯酸环氧丙酯（EAMA）与氯乙烯（VC）共聚以改进聚氯乙烯的加工性能。研究表明，少量EAMA与VC共聚，使聚合速率大为降低；共聚树脂的分子量随转化率增加而增大，随共聚组成中EAMA含量增加而逐渐减小；共取和树脂的热稳定性和加工性能随EAMA含量增加而提高。     

偏二氯乙烯-氯乙烯共聚树脂加工性能的改进

针对聚偏二氯乙烯-氯乙烯(PVDC-VC)共聚树脂加工性能较差的特点,分析了共聚物的组成、相对分子质量及其分布、颗粒结构和增塑剂等因素对加工性能的影响,提出了改进其加工性能的化学和物理方法。认为应缩短PVDC聚合反应的时间,提高生产效率、降低成本,继续提高加工过程的热稳定性和制成品的韧性,以提高竞争力。     

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。     

聚偏氯乙烯成膜用助剂

通过对聚偏氯乙烯(PVDC)树脂的结晶性及其热不稳定性的讨论，介绍了在成膜时提高树脂加工性、稳定性和薄膜强度等性能的加工助剂和改性剂。     

Rheological behavior and thermal properties of poly(butyl acrylate‐co‐2‐ethylhexyl acrylate)‐grafted vinyl chloride resin

The rheological behavior and thermal properties of a poly(butyl acrylate‐co‐2‐ethylhexyl acrylate) [P(BA‐EHA)]‐grafted vinyl chloride (VC) composite resin [P(BA‐EHA)/poly(vinyl chloride) (PVC)] and its materials were investigated. The rheological behavior, thermal stability, and Vicat softening temperature (VST) of P(BA‐EHA)/PVC were measured with capillary rheometry, thermal analysis, and VST testing, respectively. The effects of the P(BA‐EHA) content and the polymerization temperature of grafted VC on the rheological behavior of the composite resin were examined. The weight loss of the composite resin and its extracted remainder via heating were analyzed. The influence of the content and crosslinking degree of P(BA‐EHA) and the polymerization temperature of the grafted VC on VST of the materials was determined. The results indicated the pseudoplastic‐flow nature of the composite resin. The flow property of the modified PVC resin was improved because of the incorporation of the acrylate polymer. The molecular weight of PVC greatly influenced the flow behavior and VST of the composite resin and its materials. The flowability of the composite resin markedly increased, and the VST of its materials decreased as the polymerization temperature of the grafted VC increased. The initial degradation temperature of the composite resin increased as the P(BA‐EHA) content increased. The VST of the samples was enhanced a little as the content of the crosslinking agent increased in P(BA‐EHA). As expected, the composite resin, with good impact resistance, had better heating stability and flowability than pure PVC, whereas the VST of the material decreased little with increasing P(BA‐EHA) content. Therefore, P(BA‐EHA)/PVC resins prepared by seeded emulsion polymerization have excellent potential for widespread applications. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 419–426, 2005     

3 D打印用聚氯乙烯多相复合体系的开发

采用高分子类增塑剂乙烯-乙酸乙烯酯共聚物（EVM）替代聚氯乙烯（PVC）传统增塑剂,制备出具有双连续相结构的PVC/EVM/聚乳酸（PLA）共混物。通过热分析、流变学测试及微观形貌观察等研究了共混物结构与性能间的关系。结果表明,随着填料蒙脱土（OMMT）或碳纳米管的加入,PVC/EVM/PLA共混物的热分解温度和体系燃烧后的剩余物均逐渐增加,黏度略微增大且入口压力降有所减小,对玻璃化转变温度影响不大,但使得最大冷结晶温度有所升高,并且有效改善了PVC与EVM和PVC与PLA界面间的结合强度,提高了共混物的冲击强度,尺寸稳定性亦有所改善。结合打印制品外观和尺寸稳定性两方面考虑,最佳的3 D打印材料配方体系宜为PVC/EVM/PLA/OMMT-2。     

VC／BA共混物增容PVC／HDPE共混体系的研究

采用氯乙烯—丙烯酸丁酯(VC/BA)共混物作为聚氯乙烯(PVC)/高密度聚乙烯(HDPE)共混物的增容剂,通过冲击实验、拉仲实验、动态力学分析,系统地研究了共混体系性能与其结构之间的关系。通过Brabender流变仪测定了VC/BA共混物增容PVC/HDPE共混体系的流变性能。结果表明,VC/BA共混物是PVC/HDPE共混体系的良好增容剂。在一定范围内,VC/BA共混物与HDPE对PVC有协同增韧效应。vC/BA和HDPE的加入改善了PVC的塑化和流变性能     

ACR—g—VC共聚物的合成与性能研究

由两步乳液聚合合成了核－壳结构型ACR胶乳,并进一步通过ACR胶乳存在下的VC悬浮聚合合成ACR－g-VC共聚物,对接枝共聚物的结构和性能进行表征。结果表明：ACR胶乳的存在影响VC悬乳聚合的稳定性,增加分散剂用量能得到颗粒特性较好的共聚树脂;ACR－g-VC共聚物的溶胶聚合度略低于相同聚合温度的均聚PVC,凝胶含量随共聚组成中ACR含量的增加而增加;ACR－g-VC共聚物的塑化时间小于聚合度接近的均聚PVC,而加工转矩大于均聚ACR－g-VC共聚物的冲击强度随ACR含量的增加而增大,且大于ACR含量相当的PVC／ACR共混物。     

Preparation and thermal and thermo‐oxidative stability of vinylidene chloride‐co‐vinyl chloride copolymer/synthetic hectorite nanocomposites

Poly(vinylidene chloride‐co‐vinylchloride)/organically modified hectorite (VDC‐VC/SPN) nanocomposites were prepared by melt blending VDC‐VC copolymer with SPN in the presence of dioctyl phthalate, which acted as a plasticizer. As a result, the exfoliated structure was found in the VDC‐VC/SPN nanocomposites. In nitrogen atmosphere, VDC‐VC/SPN nanocomposites exhibited a single‐step thermal degradation. The thermal stability of VDC‐VC/SPN nanocomposites is significantly influenced by the SPN, which was modified with long alkyl ternary ammonium salt. In air atmosphere, VDC‐VC/SPN nanocomposites revealed a two‐step thermo‐oxidative degradation behavior. At the first degradation stage, the weight loss pattern is similar to that of VDC‐VC composites in nitrogen, in which the thermo‐oxidative stability of VDC‐VC/SPN nanocomposites is affected by the ternary ammonium salt and oxygen rather than its morphology. At the second degradation stage, both the enhanced thermo‐oxidative stability and the flame‐retardation ability of VDC‐VC composites are strongly and closely related to the morphology of nanocomposites. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci ,2009     

MBS对CPVC凝胶化的影响及CPVC/MBS共混物性能的研究

采用差示扫描量热仪和HAAKE流变仪研究了甲基丙烯酸甲酯-丁二烯-苯乙烯共聚物(MBS)对氯化聚氯乙烯（CPVC）凝胶化性能及流变性能的影响,并对CPVC/MBS共混物的力学性能、耐热性能、微观形貌进行了系统研究。结果表明,MBS能改善CPVC的加工性能。随着MBS含量的增加,共混物的凝胶化度得到极大的提高,塑化时间明显缩短,平衡扭矩不断上升,平衡温度大幅上升。MBS用量为6份时,CPVC/MBS共混物的综合性能最佳。     

蚕丝蛋白聚氯乙烯混合膜的制备及性质研究

对聚氯乙烯树脂与家蚕丝素蛋白共混膜的吸湿、热力学和染色等性能进行了研究。混合膜的酶降解特性、水分吸收和热稳定性比丝素单一膜有了较大的改进。该膜染色的外观和天然丝素膜一样透明,但其力学性能随着家蚕丝素蛋白比率的增加而下降明显。研究表明丝素蛋白粉可作为塑料的生物崩解过程的催化剂。     

Effect of segment structure on the thermal stability of CPVC in the Gas–Solid PVC chlorination process

The chlorination of the polyvinyl chloride resin with different ratios of  CH₂ , CHCl₂, and CCl₂ was carried out through a gas–solid process by varying the temperature, reaction time, and chlorine concentration. The rheological properties and thermal stability of the resin were characterized. ¹³C NMR was used to characterize the segment structure of the resin. In addition, conjugated diene structure was determined by UV–Visible to study its chlorination process. The results show that  CCl₂ units in the structure promote the dehydrochlorination of CPVC, forming a conjugated diene structure and reducing the rheological properties and thermal stability. In contrast, the formation of  CHCl in the chlorination process increased the thermal stability of the resin. Moreover, a structure-effect relationship between the structure and performance has been established, and a stepwise process of chlorination was obtained by analyzing the changes of the structure segment content at different stages.