剪切对玻璃珠填充聚丙烯结晶行为的影响

应用Linkam CSS450剪切仪、广角X射线衍射仪(WAXD)和小角X射线散射仪(SAXS)等研究了剪切对玻璃珠填充聚丙烯结晶行为的影响, 结果表明, 与纯聚丙烯相比, 填加玻璃珠的聚丙烯体系中, 玻璃珠起到成核剂的作用, 不利于β晶的生成. 玻璃珠直径较小(4 μm)时, 剪切对聚丙烯β晶的生成影响较小; 当玻璃珠直径增加到35 μm时, 剪切速率为20 s-1左右最有利于β晶生成; 剪切速率和玻璃珠直径的增加, 有利于聚丙烯片晶的取向, 而且玻璃珠含量越高, 片晶的取向程度越大.

Effect of Shear on the Crystallization Behavior of Glass Bead Filled Polypropylene

Linkam CSS450 optical shearing stage, wide-angle X-ray diffraction(WAXD) and small-angle X-ray scattering(SAXS) were used to investigate the effect of shear on crystal structure and crystallization morphology of the glass bead filled polypropylene(PP). The results indicate that the glass bead worked as nucleating agent for the glass bead filled PP, compared with pure PP it restrained the formation of β-crystal after shear treatment. When the mean size of glass bead is smaller(4 μm) shear rate had less effect on the formation of β-crystal of PP obviously. However, when the mean size of glass bead is larger(35 μm), it was found that 20 s-1 is an optimal shear rate for the formation of β-crystal. Both shear and glass bead addition could induce the orientation of the lamella of the glass bead filled PP. The higher the shear rate and the bigger the glass bead, the higher the orientation of the lamella was.