摘要
采用流变-导电行为同步测试方法,研究了等规聚丙烯(iPP)/炭黑(CB)复合体系的等温结晶行为,发现当CB体积含量φCB远高于渗流转变上限时,其体系的流变行为与导电性能均在某一特征时间处发生突变,电阻突变的特征时间短于动态储能模量(G′)或法向应力(FN)突变的特征时间,表明结晶诱导期存在CB粒子运动,促使CB粒子在晶粒尺寸增长期形成渗流网络;另一方面,与静态方法相比较,动态方法所测特征时间较短,表明动态方法对体系结晶结构变化的响应较静态方法更为灵敏.
The kinetics of isothermal crystallization for isotactic polypropylene(iPP) containing different volume fraction(φ_(CB)) of carbon black(CB) was evaluated by using differential scanning calorimetry(DSC) at 137.5℃,139.5℃ and 141.5℃ with moderate rates of crystallization.Simultaneous measurements of rheological and conduction behaviors were performed to probe the process of isothermal crystallization in dynamic and static modes.It was found that when CB volume fraction φ_(CB) was 0.09,the characteristic time ...
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2009年第3期238-243,共6页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号20774085)资助项目
关键词
流变-导电行为同步测试
等规聚丙烯/炭黑复合材料
等温结晶
Simultaneous measurement of rheological and conduction behaviors
Isotactic polypropylene
Carbon black
Composites
Isothermal crystallization
