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1.
交联助剂对PPC/NBR弹性体结构和性能的影响   总被引:2,自引:1,他引:2  
研究了马来酸酐(MA)及异氰脲酸三烯丙酯(TAIC)对聚丙撑碳酸酯/丁腈橡胶共混弹性体结构和性能的影响,发出加入MA或TAIC能有效地改善交联网络;加入适量MA能显著改善共混弹性体热氧老化稳定性;加入TAIC使共混弹性体具有优良的高弹特性和力学性能。  相似文献   

2.
利用正交法对丁苯橡胶(SBR)/聚丙撑碳酸酯(PPC)共混弹性体进行配方设计,得到了一个具有良好综合性能的配方。并通过方差分析得出PPC含量和马来酸酐(MA)用量是影响弹性体拉伸性能的最显著因素。  相似文献   

3.
偶联剂对聚氯乙烯-聚丙撑碳酸酯共混体系力学性能的影响王胜杰,黄玉惠,丛广民(中国科学院广州化学研究所广州510650)关键词聚氯乙烯,聚丙撑碳酸酯,偶联剂,丁腈胶,过氧化苯甲酰,共混聚氯乙烯(PVC)是用量巨大的通用塑料,其软性制品需用大量的增塑剂,...  相似文献   

4.
丁苯橡胶/聚丙撑碳酸酯弹性体的结构与性能   总被引:4,自引:0,他引:4  
聚丙撑碳酸酯(PPC)是由CO2和环氧丙烷在聚合物负载的双金属催化剂作用下共聚而成的一类新型高分子材料[1],其结构式如下:OHCH2CHCH3OCOOnCH2CHCH3O]mCNOoOH它的广泛应用对于环境保护和新资源开发具有实际意义.在...  相似文献   

5.
本文分别用溶液法和熔融法制得聚氯乙烯(PVC)与聚丙撑碳酸酯(PPC)共混试样,用DSC证明PVC/PPC共混物不相容,但它们不相容的程度受分子量、共混比例等因素的影响,并根据玻璃化转变温度(Tg)计算出溶液共混试样PPC富相中PVC的重量百分含量。NBR/PPC弹性体作偶联剂对PVC/PPC共混体系具有较好的增容作用,共混物中PPC的用量及分子量对共混体系性能有一定的影响。  相似文献   

6.
PPC/NBR弹性体的结构与性能   总被引:2,自引:3,他引:2  
本文研究了聚丙撑碳酸酯(PPC)/丁腈橡胶(NBR)弹性体结构形态、动态力学性能、力学性能、耐油、耐热氧老化及耐化学介质稳定性。发现PPC/NBR弹性体呈现IPN结构特征,加入PPC使NBR拉伸强度、扯断伸长率大幅度提高。PPC/NBR弹陸体具有优良的耐油及耐热氧老化稳定性。  相似文献   

7.
8.
聚乳酸与聚丙撑碳酸酯共混体系的性能   总被引:2,自引:0,他引:2  
采用熔融共混的方法制备了聚乳酸(PLA)/聚丙撑碳酸酯(PPC)共混物。DSC测试结果表明,纯PLA和PPC的玻璃化转变温度分别为54和37℃,不同组成的PLA/PPC共混物有2个明显的玻璃化转变温度,且与纯PLA和PPC的玻璃化转变温度相对应,说明二者是不相容体系。力学测试结果表明,当PPC质量分数超过20%时,可以看到明显的屈服点。共混物在拉伸过程中也有明显的颈缩、应力发白现象,表明随着PPC含量增加,PLA/PPC共混物由典型的脆性断裂向韧性转变。随着PPC含量的增加,共混物模量降低,断裂伸长率增加,当PPC质量分数为50%时,共混物的断裂伸长率达到最大值62%。共混物的粘度可在很宽的范围内予以调控,以满足不同加工的需要。  相似文献   

9.
聚氯乙烯/聚丙撑碳酸酯共混体系研究   总被引:4,自引:0,他引:4  
  相似文献   

10.
本文采用钛酸酯系列偶联剂对造纸工业废渣──木质素磺酸盐进行处理,然后填充聚氯乙烯(PVC)制成复合材料.结果发现用钛酸酯类偶联剂处理的木质素磺酸盐,填充PVC体系,其拉伸强度随使用钛酸酯偶联剂不同,拉伸强度下降幅度不同,而冲击强度和伸长率都不同程度上升,尤以冲击强度的提高最为明显.  相似文献   

11.
用示差扫描量热法(DSC)研究了线形多嵌段聚氨酯(PU)与聚氯乙烯(PVC)、氯化聚氯乙烯(CPVC)共混相容性,说明了PU/VC、PU/CPVC的相容是由于共混物中形成了新的氢键的缘故.聚酯型聚氨酯与PVC、CPVC的相容性要好子聚酸型聚氨酯,CPVC与PU的相容性又要好于PVC.聚氨酯中硬段的引入不利于PU/PVC、PU/CPVC的相容性.  相似文献   

12.
Radiation effects on the formation of conjugated double bonds in the thermal degradation of poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVA) were investigated. Thin films of PVC and PVA were either irradiated with γ-rays at ambient temperature (pre-irradiation) and then subjected to thermal treatment, or irradiated at elevated temperatures (in situ irradiation). An extensive enhancement of the thermal degradation was observed for the pre-irradiation of the PVC films, which was more effective than the effect of the in situ irradiation at the same absorption dose. For the PVA degradation, however, the effect of the in situ irradiation was larger than that of the pre-irradiation. The results were explained and related mechanisms were discussed based on radiation-induced chemical reactions and their individual contributions to the thermal degradation behaviors of the two polymers. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 3089–3095, 1998  相似文献   

13.
To assess the compatibility of blends of synthetic poly(propylene carbonate) (PPC), with a natural bacterial poly(3-hydroxybutyrate) (PHB), a simple casting procedure of blend was used. poly(3-hydroxybutyrate)/poly(propylene carbonate) blends are found to be incompatible according to DSC and DMA analysis. In order to improve the compatibility and mechanical properties of PHB/PPC blends, poly(vinyl acetate) (PVAc) was added as a compatibilizer. The effects of PVAc on the thermal behavior, morphology, and mechanical properties of 70PHB/30PPC blend were investigated. The results show that the melting point and the crystallization temperature of PHB in blends decrease with the increase of PVAc content in blends, the loss factor changes from two separate peaks of 70PHB/30PPC blend to one peak of 70PHB/30PPC/12PVAc blend. It is also found that adding PVAc into 70PHB/30PPC blend can decrease the size of dispersed phase from morphology analysis. The result of tensile properties shows that PVAc can increase the tensile strength and Young’s modulus of 70PHB/30PPC blend, and both the elongation at break and the tensile toughness increase significantly with PVAc added into 70PHB/30PPC.  相似文献   

14.
用溶液法得到线形多嵌段聚氨酯(PU)与聚氯乙烯(PV)、氯化聚氯乙烯(CPVC)的共混物。用FTIR研究PU/PVC、PU/CPVC共混物的相容性,发现PVC、CPVC的加入破坏了PU中原来的氢键,并且PU中的炭基(C=0)与PVC、CPVC中的α-H形成了新的氢键,因而说明了PU/PVC、PU/CPVC共混物具有良好的相容性。  相似文献   

15.
A Haake torque rheometer equipped with an internal mixer has been used to study the influence of microscale calcium carbonate (micro‐CaCO3) and nanoscale calcium carbonate (nano‐CaCO3) on the fusion, thermal, and mechanical characteristics of rigid poly(vinyl chloride) (PVC)/micro‐CaCO3 and PVC/nano‐CaCO3 composites, respectively. The fusion characteristics discussed in this article include the fusion time, fusion temperature, fusion torque, and fusion percolation threshold (FPT). The fusion time, fusion temperature, and FPT of rigid PVC/calcium carbonate (CaCO3) composites increase with an increase in the addition of micro‐CaCO3 or nano‐CaCO3. In contrast, the fusion torque of rigid PVC/CaCO3 composites decreases with an increase in the addition of micro‐CaCO3 or nano‐CaCO3. The results of thermal analysis show that the first thermal degradation onset temperature (Tonset) of rigid PVC/micro‐CaCO3 is 7.5 °C lower than that of PVC. Meanwhile, the glass‐transition temperature (Tg) of rigid PVC/micro‐CaCO3 is similar to that of PVC. However, Tonset and Tg of PVC/nano‐CaCO3 composites can be increased by up to 30 and 4.4%, respectively, via blending with 10 phr nano‐CaCO3. Mechanical testing results for PVC/micro‐CaCO3 composites with the addition of 5–15 phr micro‐CaCO3 and PVC/nano‐CaCO3 composites with the addition of 5–20 phr nano‐CaCO3 are better than those of PVC. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 451–460, 2006  相似文献   

16.
刘恒  李大成 《应用化学》1997,14(4):91-93
PVB存在下PVC化学法脱氯化氢的研究刘恒*李大成陈朝珍(四川联合大学化工学院成都610065)关键词聚氯乙烯,脱氯化氢,聚乙烯醇缩丁醛1996-09-08收稿,1997-05-26修回国家教育委员会留学归国人员资助费资助课题近年来在PVC脱氯化氢制...  相似文献   

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