Study on Crystallization Behavior of Liquid Crystalline Polyacrylates Induced Isotactic Polypropylene
A series of polypropylene (PP) blends were obtained by blending isotactic PP and different mass fraction of liquid crystalline polyacylates (LCP-A) at a proper process program.The effect of LCP-A as a new nucleator on crystallization behacior of isotactic PP has been investigated with wide angle X-ray diffraction (WAXD),polarized optical microscopy (POM) and differential scanning calorimetry (DSC).The experimental results showed that LCP-A in the PP played a role in the heterogeneous nucleation effect,supplied much crystal nucleus,enhanced the crystallization velocity and temperature,and the spherulites became smaller and more homogeneous.Moreover,β-phase in the PP was induced.In addition,the relative content of β-crystal (Kβ) increased with increasing LCP-A content or crystallization temperature,reached a maximum value,and then decreased as the temperature or LCP-A content further increased.Kβ of PP with 0.8% LCP-A isothermally crystallized at 125℃ for 1h was 21%.POM results that showed the morphology of β and α spherulite disappeared at 156℃ and 172℃,respectively.
liquid crystalline polymers nucleator, iostactic polypropylene crystallization behavior
Chen qian yang
Eastern Liaoning University,Liaoning Dandong 118000
国际会议
沈阳
英文
302-306
2012-09-07（万方平台首次上网日期，不代表论文的发表时间）