振荡剪切场下PS/PVME共混物的相分离对振荡剪切相位角的依赖性  

STUDY ON THE PHASE SEPARATION KINETICS OF PS/PVME UNDER OSCILLATORY SHEAR —— THE PHASE ANGLE DEPENDENCE OF PHASE SEPARATION

作　　者：罗勇[1] 欧阳文斌[1] 杨其[1] 李光宪[1] 

机构地区：[1]四川大学高分子科学与工程学院高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2006年第3期179-182,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(29934070;50273023)

摘　　要：利用自制的激光散射流变仪研究了PS/PVM E(质量比30/70)二元共混物在振荡剪切场下的相分离动力学过程,以前的工作研究了此二元体系在振荡剪切场下相行为的时间依赖性,文中进一步研究了振荡剪切场下相行为的相位角(应变)依赖性。研究发现,在一个振荡周期内,体系相关长度的变化趋势反映出,就整体而言相区会在应变增大的过程中沿流动方向取向,而在应变减小过程中减弱取向,甚至可能形成长轴沿涡流方向的形状,其原因可能是相区在外力作用下发生了粘弹变形。Following the research of the time dependence and stress response of phase separation under oscillatory shear were discussed in another paper, the phase angle dependence of phase separation is furthermore studied in this paper. It is found that, within one shear cycle, the change of correlation length in one cycle reflects that the phase is elongated along flow direction with strain increasing and when the strain decreases, the phase is compressed even to a shape with its long axis along vorticity direction. The phase＇s viscoelasticity may be responsible for this phenomenon.

关 键 词：振荡剪切 聚苯乙烯/聚甲基乙烯基醚 相分离动力学 相位角依赖性 

分 类 号：TQ316.67[化学工程—高聚物工业]