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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 grafting rate (R_p of 0-99.4%) of acrylonitrile-silk graft copolymerization fiber was characterized by thermal analysis. It was found that when R_p was 39.4%, the initial radiating effect of grafting silk began to appear obvious. With the increase of R_p, the exothermic peak position (T_p) of DSC and DTA moves toward low temperature and has a good linear relationship with T_p, and its T_p is between 245 and 275 ° C. The reaction mode, which shows characteristic exothermic effect, The enthalpy of reaction was calculated to be 21.1-26.0RJ / mol, and the existence of this mode was preliminarily confirmed from the reaction thermodynamics. The degree of vitrification (T_g) was also determined by DSC, Not long conclusion.