有机改性蒙脱土的制备及其对聚乙烯-聚苯乙烯相态和力学性能的影响

《复合材料学报》优先在线发表论文。

摘  要：利用Gemini表面活性剂对蒙脱土进行插层改性制备得到有机改性蒙脱土(OMMT)，采用溶液混合法制备了有机改性蒙脱土/聚苯乙烯(OMMT/PS)母料，将OMMT/PS母料与聚乙烯(PE)熔融共混制备得到OMMT/PS-PE复合材料。研究了蒙脱土的插层改性对PE-PS材料力学性能的影响。对OMMT进行FTIR、XRD、TG表征，结果表明Gemini表面活性剂成功插层进入蒙脱土层间。通过SEM研究了OMMT/PS-PE复合材料相结构和分散相粒径的变化及相态变化与力学性能之间的关系。结果表明，随着OMMT含量的增加，PS分散相的粒径逐渐减小；在OMMT含量为2.5wt%时，OMMT/PS-PE复合材料的相形态由“海-岛”转变为双连续结构。与未添加OMMT的PE-PS树脂相比，OMMT/PS-PE复合材料弯曲模量和断裂伸长率有着显著的提高，分别提高了18%、750%。

关键词：有机改性蒙脱土；聚乙烯；聚苯乙烯；相形态；力学性能

Abstract: Organic modified montmorillonite (OMMT) was prepared by intercalation modification of montmorillonite with Gemini surfactant. organic modified montmorillonite/polystyrene (OMMT/PS) composites were fabricated through solution mixing. The OMMT/PS composites and polyethylene (PE) were melt-blended to obtain OMMT/PS-PE composites. The effect of OMMT on the mechanical properties of PE-PS was analyzed. The characterizations of OMMT by FTIR, XRD and TG show that Gemini surfactant is successfully intercalated into the layer of montmorillonite. The morphological structure of OMMT/PS-PE composites and the changes of the particle size of PS dispersed phase, as well as the relationship between the phase transformation and the mechanical properties were examined by SEM observation. The results demonstrate that the particle size of the disperse phase gradually decreases with the addition of OMMT. The phase morphology of the OMMT/PS-PE composites changes from “sea-island” to co-continuous structure when the content of OMMT reach to 2.5wt%. Compared with PE-PS composites without OMMT, the flexural modulus and elongation at break of OMMT/PS-PE composites are significantly improved, and increases more than 18% and 750% respectively.

Keywords: organic modified montmorillonite; polyethylene; polystyrene; phase morphology; mechanical properties

作者：柯贤忠等，湖北省等离子体化学与新材料重点实验室，武汉工程大学材料科学与工程学院，武汉

通讯作者：游峰，湖北省等离子体化学与新材料重点实验室，武汉工程大学材料科学与工程学院，武汉

全文详见中国知网学术期刊优先数字出版。