摘要
采用熔融缩聚法合成了聚酰胺(PA)6/聚四氢呋喃(PTEMG)嵌段共聚物,研究了PA6、PTEMG链段的相对分子质量、含量对嵌段共聚物热性能的影响,通过傅立叶变换红外光谱、核磁共振、差示扫描量热、热重测试等对产物进行分析。结果表明,嵌段共聚物以羧基封端,当PA6、PTEMG链段相对分子质量分别为2000、1000时,共聚物的分子序列长度最长,相对分子质量最大;PTEMG链段相对分子质量越小,共聚物的熔点越低;PTEMG链段相对分子质量相同时,随PA6链段相对分子质量的增加,熔点升高;嵌段共聚物中PA6组分的熔融温度范围随着PTEMG含量的增加而逐步变宽;共聚物具有较高的热分解活化能。
A series of PA/PTEMG block copolymers with different molecular weights and contents of hard segments and soft segments were synthesized by means of melt polycondensation. The influence of molecular weights, contents and relative proportion of hard segments and soft segments on the thermal properties of block copolymer was researched, and these block copolymers were charac- terized by means of FTIR, l HNMR, DSC and TGA. The research results indicated that the two chain ends of block copolymers were blocked out with carboxyl. The block copolymer had the longest sequence length and hightest average molecular weight when the molec- ular weight of PA6 and PTEMG were 2000 and 1000 respectively. And the less relative molecular weigh of PTEMG was, the lower the Tm of block copolymers. With the increase of the molecular weigh of PA6, the Tm of block copolymers increased when the relative molecular weight of polyether segments was same. The meh temperature range of PA6 became wider as the more content of PTEMG, Thermal reaction was accompanied by high thermal degradation activation energy.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2009年第6期56-60,共5页
Engineering Plastics Application
关键词
聚己内酰胺
聚四氢呋喃
嵌段共聚物
polycaprolactam, polytetramethylene ether glycol, block copolymer
