聚烯烃离聚体原位增容PP/LLDPE共混物的研究!

Study on PP/LLDPE Blends In-situ Compatibilized by Polyolefin Ionomers

用傅立叶红外光谱(FTIR)、力学性能测试等方法研究了聚烯烃离聚体原位增容聚丙烯/线性低密度聚乙烯(PP/LLDPE)共混物。结果表明:熔融状态下,在马来酸酐接枝聚丙烯/马来酸酐接枝线性低密度聚乙烯(PP-g-MAH/LLDPE-g-MAH)(质量比50/50)共混物中加入二水醋酸锌,共混物中的马来酸酐基团(羧酸基团)与Zn2+发生离子偶联反应,相界面就地产生的聚烯烃离聚体增加了两相界面黏合力,共混物力学性能提高;原位增容后共混物中的PP和LLDPE相熔点略微下降,LLDPE结晶温度向高温移动;在角频率为0.01～100.00s-1,原位增容后共混物的储能模量、损耗模量和复数黏度都高于简单共混物的,损耗正切(tanδ)低于简单共混物的;对于PP/PP-g-MAH/LLDPE/LLDPE-g-MAH四元体系,SEM显示原位增容后共混物的相界面变得模糊,相容性提高。

In-situ compatibilization of PP and LLDPE blends with polyolefin iono- mers was investigated by FTIR, and mechanics performance testing, etc. The results show that in melt state, the ionic coupling takes place between the maleic anhydride （carboxylic acid） groups and Zn^2＋ when adding Zn（Ac）2 · 2H2O into PP-g-MAH/LL- DPE-g-MAH（mass ratio of 50/50） blends, polyolefin ionomers form at the interface, interracial adhesion of PP and LLDPE phases are increased, the mechanical properties of the blends are increased. The melting points of the PP phase and LLDPE phase of the compatibilized blends are slightly reduced, the crystallization temperatures of the LL- DPE move to the high temperature. In the 0. 01-100. 00 s^-1langular frequency range, storage modulus, loss modulus and complex viscosity of the in-situ compatibilized blends are higher than those of the mechanical blends, while loss tangent（tanδ） is lower than that of the mechanical blends. For the PP/PP-g-MAH/LLDPE/LLDPE-g-MAH blends, SEM showes that the phase interface of the in-situ compatibilized blends turns into blurring, and the compatibilition is enhanced.