摘要
近年来非晶聚合物玻璃态-橡胶转变及分子运动受到众多学者关注。α'转变被证实在非晶聚合物玻璃态-橡胶转变区中普遍存在,Rouse运动模型能较好地描述其转变机理,即转变区中包含有链段、Sub-Rouse、Rouse不同长度单元的运动及转变。其转变行为主要受屏蔽效应和耦合作用的影响,屏蔽效应影响转变区的宽度,而耦合作用影响转变耗散峰的大小。对于具有较强屏蔽效应和耦合作用的聚合物,由于动态脆性较强和转变区较窄,不同运动模式的转变难以被分离而观察到。文中综述了能有效分离和观察不同运动及转变的增塑、稀释以及二维相关谱图等方法,总结了考察分子运动及转变行为的表征手段,对进一步研究进行了展望。
Transitions and molecule motions in glass-rubber transition zone of amorphous polymers have been gotten by more and more attentions from scholars recently. The α' transition was proved generally existing in glass-rubber transition zone of amorphous polymers. Rouse model can better describe the mechanism of transition,namely,the motions and transitions of local segments,sub-Rouse and Rouse units are included in the glass-rubber transition zone. Its transition behavior is mainly affected by the packing efficiency and the coupling effect. The width of the transition zone is majorly affected by the coupling effect,and the shape of dissipation peaks is mainly affected by the packing efficiency. To some polymers with large dynamic fragility,those three models cannot be observed for the low packing efficiency and the high intermolecular coupling effect. Dissolution and plasticization methods are good way to resolve three models. Others,twodimensional correlation spectroscopy method can be used to detect location and properties of three models through mathematical ways to deal with original spectroscopies,like dynamic mechanical analysis( DMA) and dielectric probe. Furthermore,the general measurement methods about characterizing α' transition also were listed in this review.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2015年第4期186-190,共5页
Polymer Materials Science & Engineering
基金
四川省科技厅应用基础项目(2015JY0052)
油气藏地质及开发工程国家重点实验室(西南石油大学)资助项目(PLN1429)
