原位聚合PVC/CaCO3纳米复合树脂及其性能特征

摘要

用纳米CaCO3的微乳化分散技术,制备得到了一种氯乙烯/纳米CaCO3原位聚合PVC树脂.FTIR、TGA、流变性能和维卡热变性温度等测试表明,新产品树脂微熵热失重曲线上速率变化极大值的温度从293.8℃上升到301.8℃.同时流变测试显示在较高剪切应变下,熔体扭矩比通用PVC树脂下降幅度增加了近一个数量级,ThermoHaake流变仪上测得塑化熔融时间从通用PVC树脂的6min减小到2.5min.此外,冲击强度和断裂伸长率都比通用PVC树脂提高了2倍以上,加工成异形材后的焊接角强度提高了17％.%In-situ microemulsion polymerization was used to fabricate the PVC/nano-CaCO3 composite. FTIR, TGA.ThermoHaake rheogeniometer and Vicat temperature test were employed to characterize the novel composite. The results showed that the derivative thermal weightlessness temperature of the resultant fabrication rised from 293.8 V to 301.8 °C, and compared to normal PVC resin, the melt torque decreased about one magnitude under high shearing rate. The thermohaake rheologic test demonstrated that the melting time reduced from 6min for the normal PVC resin to 2.5min for the novel composite. Forthermore, in comparison with the normal PVC resin, the impact strength and the breaking extension of the novel composite increased nearly 2 times, as for the welding strength of the section materials prepared by the novel composite increased 17%.