氯化原位接枝技术制备改性CPVC的研究

采用氯化原位接枝技术制备了改性CPVC，研究了在气固相中氯化接枝的规律，讨论了单体苯乙烯（St）和甲基丙烯酸甲酯（MMA）用量、氯含量以及氯化反应温度对产物性能的影响。结果表明，单体用量为10份左右时，改性CPVC的屈服强度高于CPVC的屈服强度；加入St改性后，氯化反应温度120℃时可得到屈服强度较高的CPVC—g—St；在135℃可得到维卡软化点较高的CPVC—g—St；单体用量适当，可同时提高改性CPVC的屈服强度和韧性。     

苯乙烯氯化原位接枝改性氯化聚氯乙烯的研究

采用氯化原位接枝技术制备了苯乙烯(St)改性氯化聚氯乙烯(PVCC)。研究了St单体加入量、氯含量对PVCC物理、力学性能及流变性能的影响。结果表明,St的加入量为10份左右时,改性PVCC的拉伸屈服强度达到最大值(69MPa),较未改性PVCC约提高17%,但维卡软化点降低;改性PVCC的拉伸屈服强度和维卡软化点均随氯含量的增加而提高;改性PVCC的熔体粘度较未改性PVCC的低,加工温度范围变宽。     

CPVC增韧改性的研究

研究了苯乙烯-丁二烯-丙烯腈共聚物（ABS）、甲基丙烯酸甲酯-丁二烯-丙烯腈共聚物（MBS）、氯化聚乙烯（CPE）、聚氯乙烯和邻苯二甲酸二辛酯增韧氯化聚氯乙烯（CPVC）的冲击性能。结果表明，MBS、CPE和ABS能有效提高CPVC的冲击强度，其中MBS对CPVC体系增韧效果最为明显，添加10份（质量份数）MBS的CPVC的冲击强度较未添加增韧剂的提高了48.8%。增韧剂的加入使体系的拉伸强度、维卡软化点均有不同程度的下降，其中MBS维卡软化点降低得最少,为118.7 ℃,较未添加增韧剂的CPVC体系只降低了1.9 ℃。增韧剂的加入对CPVC体系的加工性能有影响。添加MBS后加工性能较好，优于其他增韧剂。当加入10份MBS的时候，材料的综合性能较好。     

PVC氯化原位接枝HEA接枝共聚物的性能研究

以氯气为引发剂，采用气-固相方法在加热条件下合成聚氯乙烯（PVC）、丙烯酸-2-羟基乙酯（HEA）的氯化原位接枝共聚产物（PVC—cg-nEA）。用IR、GPC、DSC等对氯化原位接枝共聚产物进行表征；初步探索产物的流变性能；讨论了单体加入量、反应温度、膨润时间等不同合成条件对产物力学性能的影响。试验结果表明，单体加入量10份，反应温度120℃，膨润时间24h，接枝共聚产物具有最佳的力学性能。     

ACS用量对CPVC-ACS复合材料的性能影响

采用机械共混法制备了氯化聚氯乙烯(CPVC)、丙烯腈-氯化聚乙烯-苯乙烯(ACS)二元共混复合材料(CPVC-ACS),研究了共混复合材料的组成与材料力学性能、耐热性能、阻燃性能和抗老化性能的关系。结果表明,ACS加入到CPVC中,可达到良好的增韧效果,但ACS用量的增加使CPVC的拉伸强度和维卡软化点温度降低;ACS对CPVC的阻燃性能影响不大,改性CPVC均可达到难燃级;用ACS改性CPVC的抗老化性能明显优于CPVC-ABS。     

PVC氯化接枝聚合制备CPVC-g-VDF接枝共聚物的研究

通过将聚氯乙烯（PVC）氯化原位接枝共聚含氟单体生成氯化聚氯乙烯接枝偏氟乙烯（CPVC-g-VDF）,当配比为VDF占CPVC-g-VDF量的4％时,接枝聚合的效果最好,所得接枝聚合物的综合性能优于聚氯乙烯.     

氯化聚氯乙烯的高性能化研究

以苯乙烯(St)和丙烯酸丁酯(BA)单体对氯化聚氯乙烯(CPVC)进行力化学改性.研究及分析了苯乙烯、丙烯酸丁酯单体及增韧剂的加入量对CPVC流变性能、力学性能及耐热性能的影响.实验结果表明:力化学改性CPVC是一种简单、有效的方法.经红外光谱测试证明,通过力化学方法可以制备CPVC-g-St及CPVC-g-BA共聚物.改性后的CPVC的加工性能和冲击强度均有明显提高,且保持了其良好的耐热性.     

氯化聚乙烯增韧改性硬聚氯乙烯制品的研究

氯化聚乙烯（ＣＰＥ）是聚氯乙烯较好的抗冲击改性剂，改性的硬质聚氯乙烯制品冲击强度有较大提高。ＣＰＥ的加入，拉伸强度、弯曲强度、维卡软化点性能下降，刚性受损。ＣＰＥ具有促进ＰＶＣ凝胶化的作用，能改善其加工性能。     

PVC-C/PVC共混材料的性能研究

采用氯化聚乙烯（CPE）对氯化聚氯乙烯（PVC—C）进行抗冲改性，将改性后的PVC—C与PVC进行共混，研究了PVC-C／PVC配比对PVC-C／PVC共混物力学性能、耐热性能及流变形能的影响。结果表明，PVC—C／PVC共混物的维卡软化点随PVC—C的用量增加而上升，在50／50（质量比）处有一拐点，大于50／50时上升更快些。共混物的拉伸强度、弯曲强度和熔体黏度随PVC—C用量的增加而提高；混物中随PVC—C用量增加，塑化时间缩短，塑化能力增强，而冲击强度和断裂伸长率却随PVC—C用量增加而下降。共平衡转矩增加。     

氯化聚氯乙烯市场发展将加快

氯化聚氯乙烯（CPVC）是PVC进一步氯化的产物，作为PVC重要改性产品，它具有多种优良的性能，可在一定范围内取代一些传统的热塑性工程塑料，近年来应用领域不断拓展。     

PE氯化接枝St/AN共聚共混物研究

采用固相法对聚乙烯(PE)进行氯化接枝苯乙烯/丙烯腈(St/AN)单体,制得了改性氯化聚乙烯(CPE)材料。探讨了氯化反应温度、氯含量、引发剂过氧化苯甲酰(BPO)用量和单体配比对聚合物力学性能的影响,实验中还对PE接枝了不同单体,结果表明,采用二段温度(70℃,120℃)法,氯质量分数为35%,BPO加入质量为0.24g,m(St)/m(AN)为1:1时,可制得力学性能较好的CPE材料。极性单体MA、AN及St的加入提高了CPE材料的拉伸强度。     

PB橡胶粒径对CPVC/PVC/ABS共混体系结构与性能的影响

采用乳液聚合技术合成了一系列不同PB橡胶粒径的ABS核壳改性剂,将其与CPVC、PVC共混,考察了CPVC/PVC/ABS共混物的结构与性能。动态力学分析表明：CPVC与PVC比例为90/10时,CPVC/PVC共混物部分相容,CPVC/PVC/ABS共混物也是部分相容;扫描电子显微镜分析其形态结构表明：共混物中ABS分散受PB橡胶粒径影响,PB橡胶粒径为113 nm的ABS在CPVC中分散最均匀。力学性能测试表明：随着PB橡胶粒径的增加,共混物的冲击强度先增大后减小,拉伸强度并无明显变化。     

Graft‐modified HCPE with methyl methacrylate by the mechanochemistry reaction. II. Physical‐mechanical properties and processability

In this article, the physical‐mechanical properties and processability of graft‐modified highly chlorinated polyethylene (HCPE; chlorine contents: ≥ 60%) with methyl methacrylate (MMA) by mechanochemistry reaction were studied. The results showed that the HCPE‐g‐MMA system is superior to unmodified HCPE in physical‐mechanical properties, particularly in processability. In addition, the HCPE‐g‐MMA system, with about 62% chlorine content, was the same as PVC in its physical‐mechanical properties. The HCPE‐g‐MMA system, with about 65.5% chlorine content, is the same as chlorinated poly(vinyl chloride) (CPVC) in its physical‐mechanical properties, except that the Vicat softening temperature and processability of HCPE‐g‐MMA system are superior to PVC and CPVC. Compared with PVC and CPVC, the HCPE‐g‐MMA system proves better due to its lack of a toxic monomer. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 282–287, 2004     

The toughness and morphology of (chlorinated poly[vinyl chloride])/(methyl methacrylate‐butadiene‐styrene) blends

A series of methyl methacrylate‐butadiene‐styrene (MBS) graft copolymers were synthesized via seeded emulsion polymerization techniques by grafting styrene and methyl methacrylate on poly(butadiene‐co‐styrene) (SBR) particles. The chlorinated poly(vinyl chloride) (CPVC)/MBS blends were obtained by melting MBS graft copolymers with CPVC resin, and the effect of the core/shell ratio of MBS graft copolymer and SBR content of CPVC/MBS blends on the mechanical properties and morphology of CPVC/MBS blends was studied. The results showed that, with the increase in the core/shell ratio, the impact strength of the blend increased and then decreased. It was found that, when the core/shell ratio was 50/50, the impact strength was about 155 J/m, and the tensile strength evidently increased. The toughness of the CPVC/MBS blend was closely related to the SBR content of the blend, and with the increasing of SBR content of blend, the impact strength of the blend increased. The morphology of CPVC/MBS blends was observed via scanning electron microscopy. Scanning electron microscopy indicated that the toughness of CPVC/MBS blend was consistence with the dispersion of MBS graft copolymers in the CPVC matrix. J. VINYL ADDIT. TECHNOL., 22:501–505, 2016. © 2015 Society of Plastics Engineers     

CPVC/PVC/ACR三元共混材料的研究

研究了CPVC／PVC/ACR三元共混材料的物理力学性能。结果表明，共混材料的维卡软化温度和拉伸屈服强度随CPVC用量的增加而增加；当ACR用量为6-8份时，可明显改善共混材料的抗冲性能。     

CPVC对PVC性能的影响

研究了在PVC中添加不同量的CPVC共混体系的加工性能、耐热性能、力学性能。实验结果表明:随着CPVC含量的增加,共混体系的加工性能变的较为困难,但拉伸强度和维卡软化点温度有明显提高,缺口冲击强度和断裂伸长率有所下降。当CPVC用量为20份时,是实际生产及实际应用的一个较为理想的比例。     

Processing aids for chlorinated polyvinyl chloride

Comparative studies of melt processability showed that chlorinated polyvinyl chloride (CPVC) had low melt index and high Brabender melt temperature and torque, as compared with conventional rigid polyvinyl chloride (PVC). Of 3 processing aids at 10 percent concentration, triphenyl phosphate increased melt index 30-fold, fusion rate 10-fold, melt temperature 20°C, and torque 31 percent in CPVC. Two other processing aids, an acrylic and a styrene/acrylonitrile copolymer, were less effective. Improvements in PVC were less dramatic than in CPVC. Overall, use of processing aids made CPVC processability equal or even superior to conventional rigid PVC.