PPC对POM熔融、结晶及力学性能的影响  

The Effects of Poly( propylene carbonate) on Melting,Crystallization and Mechanical Properties of Polyoxymethylene

作　　者：雷小梅[1] 罗发亮[1] 司朋飞 沈志远[1] 丁生芳 

机构地区：[1]宁夏大学化学化工学院,省部共建天然气转化国家重点实验室培育基地,宁夏银川750021

出　　处：《塑料》2016年第6期17-20,24,共5页Plastics

基　　金：国家自然科学基金(21264012)

摘　　要：采用熔融共混的方法制备了聚甲醛(POM)/聚碳酸亚丙酯(PPC)合金材料,研究了该复合材料的熔融、结晶及力学性能。结果显示,相对纯POM而言,合金中POM的结晶与熔融温度以及相应的焓值均下降,结晶速率降低,结晶活化能升高;当PPC的含量达到90%时,合金中POM的结晶度从77.8%下降到了68.1%,下降了9.7%。另外,相对POM而言,PPC与POM的合金化极大的提高了POM的断裂伸长率,当合金中PPC的含量达到50%时,POM的断裂伸长率从68%升高到569%,提高了8.4倍。相对PPC而言,PPC与POM合金化改善了单一PPC的力学性能,合金中添加50%的POM质量份数使PPC的断裂伸长率从453%增大到569%,比纯PPC增大了116%,同时使PPC的弯曲性能和韧性得到了提高。The alloys of polyoxymethylene （POM） and Poly （propylene carbonate） （PPC） were prepared by melt blending. The melting,crystallization and mechanical properties of POM/PPC alloys were investigated. The results showed that the crystallization temperatures （ Tc ）, melting temperatures （ Tm ）, crystalline enthalpy （ △Hc ）, melting enthalpy （ △Hm ） and the crystallization rate of POM in the alloys decreased. While, the crystallization activation energy of POM in the alloys increased with the increasing of PPC content compared with the pure POM. When the PPC content was up to 90% ,the crystallinity of POM in the alloys decreased from 77.8% to 68.1% ,reflecting a 9.7% reduction. In addition,as for POM ,PPC alloying with POM greatly improved the elongation at break of POM. When the content of PPC in the alloys was 50% , the elongation at break of POM increased from 68% to 569% ,which increased 8.4 times compared with pure POM. As for PPC,POM alloying with PPC could improve the mechanical properties of single PPC. When the content of the POM in the alloys was 50 % , the elongation at break of PPC increased from 453 % to 569% , which increased by 116% compared with pure PPC. Meanwhile, the addition of POM improved the toughness and bending property of PPC.

关 键 词：聚甲醛 聚碳酸亚丙酯 熔融共混 结晶 力学性能 

分 类 号：TQ326.51[化学工程—合成树脂塑料工业]