摘要
用DSC法研究了聚苯醚(PPO)、羧化度为16.0mol%的羧化PPO(C-PPO)和相应的C-PPO的正十二酯(Et-CPPO)在稍低于玻璃化转变温度等温退火的热焓松弛行为,讨论改性基团对热焓松弛速率的影响。发现三种样品在等温退火过程中产生的吸热峰随退火时间或温度的增加而增加。在相同退火条件下,峰宽随侧基链加长而增加,热焓松弛速率降低。
DSC was used to study the process of the enthalpy relaxation below T_g of poly(2, 6-dimethyl-1, 4-phenylene oxide) (PPO), carboxylated PPO(C-PPO) and laurate of PPO(Ee-PPO). The effect of modified groups on the enthalpy relaxtion and on the mechanism of molecular motion was discussed. It was found that the endothermic peaks of the samples increased in magnitude and shifted to higher temperature with the increase of the annealing time and temperature. The rate of enthalpy relaxation decreased with the increase of side chain length in the same annealing conditions. It was supposed that the process was the restricted internal rotation of the benzene-to-oxygen bond in the chain backbone.
出处
《功能高分子学报》
CAS
CSCD
1991年第3期181-186,共6页
Journal of Functional Polymers
基金
国家自然科学基金
高分子物理开放实验室资助课题
关键词
聚苯醚
羧化聚苯醚
热焓松驰
poly(2,6-dimethyl-1,4-phenylene oxide)(PPO), carboxylated PPO, laurated PPO, enthalpy relaxation
