研究了纳米碳酸钙(CaCO_3)对氯化聚乙烯(CPE)/丙烯酸树脂(ACR)/聚氯乙烯(PVC)共混体系力学性能的影响,并通过动态机械热分析(DMA)和扫描电子显微镜(SEM)对共混体系的力学松弛行为、纳米CaCO_3在CPE/ACR/PVC共混体系中的分散状态及共混体系的断面形貌特征进行了表征.结果表明,纳米CaCO_3能够显著提高CPE/ACR/PVC共混体系的冲击性能,而不降低共混体系的强度.加入纳米CaCO_3后,共混体系的低温损耗(tanδ)峰强度显著增大,并且与冲击强度的变化具有很好的对应性.SEM观察发现,8 phr纳米CaCO_3可在CPE/ACR/PVC基体中形成纳米尺度的均匀分散,加入过多纳米CaCO_3则会出现明显的团聚.
The effects of nanoscale calcium carbonate(nano-CaCO_3)on mechanical properties of chlorinated polyethylene(CPE)/aerylics(ACR)/poly(vinyl chloride)(PVC)blends were investigated. The mechanical relaxation behavior of the blends, the dispersed situation of nano-CaCO_3 in polyblends matrix and the fractured surface morphologies of the blends were characterized by dynamie mechanical analyzer(DMA)and scanning electron microscopy(SEM), respectively. The results show that the impact properties of the CPE/ACR/PVC blends are remarkably improved due to the introduction of nano-CaCO_3, however, the tensile strength of the blends hardly reduced. Additionally, the intensity of low temperature loss factor(tanδ)of polyblends increases obviously after the addition of nano-CaCO_3, which is just in line with the change in impact strength values of the blends. The SEM exhibits that the uniform dispersion of nano-CaCO_3 in polyblends matrix at nano-scale can be obtained when 8 phr nano-CaCO_3 is added, whereas more nano-CaCO_3 easily leads to the agglomeration of nano-partide in matrix.
参考文献
| [1] | 胡圣飞,严海标,王燕舞,林志云.纳米级CaCO3填充PVC/CPE复合材料研究[J].塑料工业,2000(01):14-15. |
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