γ射线辐照法制备的聚醋酸乙烯酯/蒙脱土纳米复合材料与高密度聚乙烯共混物的研究

Study on the blend of HDPE and PVAC-montmorillonite nanocomposite prepared via γ-ray irradiation

利用γ射线辐照法,引发醋酸乙烯酯在蒙脱土中的原位插层聚合。X射线衍射测试结果表明,所制得的聚醋酸乙烯酯/蒙脱土复合材料为纳米复合材料,透视电子显微镜观察结果更给予了直观说明。扫描电镜测试结果表明,醋酸乙烯酯/蒙脱土纳米复合材料与高密度聚乙烯共混有助于片状蒙脱土纳米粒子在高密度聚乙烯基体中的均匀分散。而且由于蒙脱土片晶包裹在与高密度聚乙烯相容性较好的聚醋酸乙烯酯中,有助于提高复合材料的相容性。热失重测试结果说明,蒙脱土纳米粒子的存在有助于高密度聚乙烯热稳定性的提高。力学性能测试结果表明,聚醋酸乙烯酯/蒙脱土复合材料与高密度聚乙烯共混后,其力学性能得到了改善。阻隔性能测试结果显示,聚醋酸乙烯酯/蒙脱土/高密度聚乙烯纳米复合材料对水蒸气的阻隔性能优于高密度聚乙烯。

The in situ intercalated polymerization of vinyl acetate and montmorillonite clays (MMT) was initiated via γ-ray irradiation. Results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate that polyvinyl acetate (PVAC)-montmorillonite clays (MMT) composite was a kind of nanocomposite. Scanning electron microscopy (SEM) testing result shows that the nano-particles of MMT were packaged by PVAC and the capsule particles was formed, so the MMT particles could be better dispersed in the matrix of HDPE when the polyvinyl acetate (PVAC)-montmorillonite (MMT) nanocomposite was melt-blended with HDPE. For the good compatibility of PVAC and HDPE, these capsule particles are also compatible with HDPE. Thermogravimetric analysis (TGA) results show the existence of MMT nano-particles in the HDPE is helpful to increase the thermostability of it, and the mechanical properties of HDPE were improved. Moreover, the PVAC/ MMT/ HDPE nanocomposite exhibit much better water vapor permeation resistance than HDPE.