摘要
以柱状微相分离结构的聚乙烯基环己烷-聚乙烯-聚乙烯基环己烷(PVCH-PE-PVCH)三嵌段共聚物为研究对象,分别采用压延法和旋转涂膜法制得取向样品。利用偏振红外光谱法测定了PE柱状微区内结晶区中—CH2—基团的面内扭摆振动吸收峰的变化,以此来考察PE晶区折叠链片晶的链轴在柱状微相分离结构中的取向性。结果表明:在压延取向的样品中,由于外力的作用使得PE柱状微区沿着样品流动的方向取向,PE片晶的链轴也同样倾向于沿着平行于PE柱状微区的柱轴方向排列。退火使得PE片晶沿着链轴取向方向的取向程度升高。在由旋转涂膜制得的取向薄膜样品中,PE柱状微区垂直于基板排列,而PE片晶链轴则更倾向于沿着垂直于PE柱状微区的柱轴方向取向。
Orientation of PE chains for cylindrical poly（vinylcyclohexane）-b-poly（ethylene）-b-poly（vinyl- cyclohexane） （PVCH-PE-PVCH） samples pressed and spin-coated respectively were investigated. The changes of the in-plane rocking vibration of--CH2- groups which belonging to the PE crystalline domains were measured by polarized Fourier transform infrared spectroscopy. The results indicated that the chains of the PE crystal preferred to align parallel to the direction of the cylindrical microdomains in the pressed samples, owing to the PE main chains oriented along the direction of the external force. The extention of orientation of the PE chains increased by annealing. However, in the spin-coated films, the PE chains pre- ferred to orient perpendicular to the cylinder axis of the cylindrical microdomains.
出处
《功能高分子学报》
CAS
CSCD
北大核心
2009年第1期1-6,共6页
Journal of Functional Polymers
基金
国家自然科学基金(2067404420874056)资助项目
