摘要
采用热分析法,对接枝率(R_p为0—99.4％的丙烯腈-蚕丝接枝共聚纤维进行了表征。发现当R_p为39.4％时,接枝蚕丝开始出现明显的特征初始放热效应。随着R_p的增大,DSC、DTA的放热峰位(T_p)朝低温向移动,并与T_p成良好的线性关系,其T_p在245—275℃之间。引用表现特征放热效应的反应模式,计算出反应热焓为21.1—26.0RJ/mol,从反应热力学上初步证实了该模式的存在。还用DSC法,测定了接技蚕丝的玻璃化程度(T_g),得到丙烯腈接技链段不长的结论。
The silk fibers grafted with acrylonitrile which the degree of grafting (RP) ranging from 0—99.4％ were characterized bymeans of thermal analysis. It was discovered that acharacteric exothermal effect begins to appear obviously in the thermograms when R_p≥39.4%. The result shows the linear relationship between R_p and the exothermal peak temperature(T_p)arourd 245—275℃.According to the calculation of thermodynamics, obtained the enthalpy(△H), 21.1—26.0KJ/mol,the reaction model has been confirmed, belonging to the cyclization reaction of the PAN's branch chain. The T_g of the grafted silk and the native silk were measured by DSC method and discussed.
出处
《天然产物研究与开发》
CAS
CSCD
1989年第2期6-10,共5页
Natural Product Research and Development
关键词
蚕丝纤维
丙烯腈
接枝共聚物
silk fibers, acrylonitrile, grafting copolymer, thermal analysis, characteric exothermal effect
