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通过固相接枝法制备聚丙烯(PP)与马来酸酐、甲基丙烯酸甲酯和丙烯酸丁酯的多单体接枝共聚物(PPTM)。采用差示扫描量热法、X射线衍射和偏光显微镜等研究接枝支链对接枝共聚物结晶行为的影响,并计算接枝共聚物的晶胞参数。接枝支链能诱导PPTM的异相成核,形成β晶型,也能阻碍结晶的进行。接枝支链诱导PPTM形成β晶型需要合适的支链长度。PPTM的微晶尺寸和晶胞参数都受到接枝支链的影响。PPTM的c轴(晶体生长方向)的晶胞参数比PP的稍大。
A multi-monomer graft copolymer (PPTM) of polypropylene (PP) with maleic anhydride, methyl methacrylate and butyl acrylate was prepared by solid phase grafting. The effects of graft branches on the crystallization behavior of graft copolymers were investigated by differential scanning calorimetry, X-ray diffraction and polarized light microscope. The unit cell parameters of the graft copolymers were also calculated. Graft branching can induce heterogeneous nucleation of PPTM to form β crystal, which can also hinder the crystallization. Graft Branching Induction PPTM requires a suitable length of branch to form a beta form. The crystallite size and cell parameters of PPTM are all affected by the grafted branches. PPTM c-axis (crystal growth direction) cell parameters slightly larger than PP.