改性聚乙烯醇/聚乙二醇共混复合材料的制备与性能

Preparation and Properties of Modified Poly(Vinyl Alcohol)/Poly(Ethylene Glycol) Composites

通过溶液共混法制备了改性聚乙烯醇(VE-PVA)与不同类型聚乙二醇(PEG)的共混复合材料,分别研究了相对分子质量、含量、不同端基类别的聚乙二醇对VE-PVA/PEG复合材料性能的影响。通过差示扫描量热分析、动态力学分析、拉伸测试、动态流变测试等考察VE-PVA/PEG复合材料的热性能、力学性能及流变性能。结果表明,PEG和VEPVA是相分离体系,各自形成独立的晶相。PEG在一定程度上会阻碍VE-PVA结晶,降低其结晶温度和结晶度。PEG对VE-PVA有明显的增塑和润滑作用,能降低熔体黏度,改善体系加工性能。而且PEG中端羟基含量越大,增塑作用越强。当PEG质量分数小于10%时,能提高复合材料的断裂伸长率。

Modified poly （vinyl alcohol） （VE-PVA）/poly （ethylene glycol） （PEG） composites were prepared by solution blending. The effect of molecular weights, contents and different categories of PEG on the properties of the composites was studied. The thermal, mechanical and rheological properties of the composites were characterized by DSC, DMA, mechanical test and dynamic rheological test. The results show that VE-PVA and PEG are phase separated systems, and each of the individual components shows its own melting temperature. PEG hinders VE-PVA crystallization, resulting in crystallization and nucleation rates decreasing. PEG can act as plasticizer and lubricant for VE-PVA, thus reducing the melt viscosity, improving system processing performance. The content of hydroxyl group in PEG is critical for VE-PEA plasticization. The higher content leads to better plasticizing effect. PEG can improve the ductility of VE-PVA/PEG composites when the mass fraction of PEG is under 10%.