Non-isothermal crystallization kinetics of polypropylene containing silica hybrid particles as fillers
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摘要: 将原位乳液聚合制得的SiO2-聚合物杂化微球与聚丙烯熔融共混制备了SiO2/聚丙烯(SiO2/PP)复合材料, 利用差示扫描量热法(DSC)研究了SiO2/PP复合材料的非等温结晶动力学行为。结果表明, SiO2-聚合物杂化微球具有明显的异相成核效应, 提高了PP的结晶温度和结晶速率, 同时降低了PP的结晶度, 提高了PP的结晶活化能。运用Mo法处理纯PP和SiO2/PP复合材料的非等温结晶动力学, 结果显示SiO2-聚合物杂化粒子降低了聚丙烯在单位结晶时间内达到一定结晶度时所需的降温速率。
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关键词:
- 原位乳液聚合 /
- SiO2-聚合物杂化微球 /
- SiO2/聚丙烯复合材料 /
- 差示扫描量热法 /
- 非等温结晶动力学
Abstract: By means of in situ emulsion copolymerization, core-shell silica hybrid particles with poly(MMA-co-BA) shells were fabricated, which were subsequently compounded with isotactic polypropylene (PP) in the molten state to prepare SiO2/PP composites. The non-isothermal crystallization kinetics of SiO2/PP composites was investigated by DSC. The results show that the addition of silica hybrid particles has an obvious nucleating effect on the crystallization of PP, increasing crystallization temperature and crystallization rate. On the contrary, the activation energies of SiO2/PP are higher than that of the pure PP. The kinetics of non-isothermal crystallization of SiO2/PP can be indicated by Mo equation. It shows that silica hybrid particles decrease the cooling rates of PP needed to reach relative crystallinities in a unite time. -
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