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Formation of various crystalline structures in a polypropylene/polycarbonate in situ microfibrillar blend during the melt second flow

机译:在熔体第二流过程中,聚丙烯/聚碳酸酯原位微原纤共混物中形成各种晶体结构

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A strong shear flow was imposed on the melt of polycarbonate (PC) microfibrils with beta-nucleation agent reinforced isotactic polypropylene (iPP) during the melt second flow process, i.e. gas-assisted injection molding (GAIM). A special shell-core structure was formed in the iPP/PC microfibrils with b-nucleation agent (PP/PC/beta-NA) composites. A lot of beta-transcrystalline and alpha-transcrystalline superstructures were observed in the skin and sub-skin regions, whereas beta-spherulite structures were formed in the gas channel region. There is no doubt that the distinct hierarchical structure has great potential to significantly improve the mechanical performance of the composites, and the experimental results verify this. The results of the mechanical performance testing show that the yield strength of the PP/PC/beta-NA composites reached 61.9 MPa, which is 19.7 MPa higher than that of the iPP parts molded by GAIM (G-iPP) (42.2 MPa). The tensile modulus of the PP/PC/beta-NA composites (3.3 GPa) increased by 135%, compared to that of G-iPP (1.4 GPa). The high content of beta-crystals improved the elongation at break of the composites compared to the iPP/PC microfibril (PP/PC) composites; the elongation at break of the PP/PC/beta-NA composites (13%) is over 3 times greater than that of the PP/PC composites (4%).
机译:在第二次熔体流动过程中,即在气体辅助注射成型(GAIM)过程中,具有β成核剂增强的全同立构聚丙烯(iPP)的聚碳酸酯(PC)微原纤维的熔体受到强剪切流。在具有b-成核剂(PP / PC / beta-NA)复合材料的iPP / PC微纤维中形成了特殊的壳核结构。在皮肤和亚皮肤区域观察到许多β-反晶和α-反晶超结构,而在气体通道区域形成了β-球晶结构。毫无疑问,独特的分层结构具有显着改善复合材料机械性能的巨大潜力,实验结果证明了这一点。力学性能测试结果表明,PP / PC /β-NA复合材料的屈服强度达到61.9 MPa,比GAIM(G-iPP)模制的iPP部件的屈服强度(42.2 MPa)高19.7 MPa。与G-iPP(1.4 GPa)相比,PP / PC /β-NA复合材料的拉伸模量(3.3 GPa)增加了135%。与iPP / PC微纤维(PP / PC)复合材料相比,高含量的β晶体可改善复合材料的断裂伸长率; PP / PC /β-NA复合材料的断裂伸长率(13%)是PP / PC复合材料的断裂伸长率(4%)的3倍以上。

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