有机蒙脱土改性PP-R的热学性能及显微结构研究

Study on Thermal Properties and Microstructure of PP-R Modified by OMMT

用熔融插层法制备了PPR(无规共聚聚丙烯)/OMMT(有机蒙脱土)及PPR/OMMT/PPMA(马来酸酐接枝聚丙烯)纳米复合材料;用X小角衍射检测了PPR/OMMT及PPR/OMMT/PPMA纳米复合材料中OMMT层间距的变化;用DSC,TGA,TEM等考察了纳米复合材料热学性能、显微结构、线性热膨胀系数等的变化.结果表明:随着OMMT含量的增加,其在PPR/OMMT纳米复合材料中的插层效果逐渐减弱;m(PPMA)∶m(OMMT)∶m(PPR)为10∶4∶90时,OMMT在PPR/OMMT/PPMA纳米复合材料中的插层效果最佳;随着OMMT含量的增加,PPR/OMMT纳米复合材料的热分解温度提高,线性热膨胀系数减小;随着PPMA含量的增加,PPR/OMMT/PPMA纳米复合材料的热分解温度呈先升后降趋势.

PP-R/OMMT and PP-R/OMMT/PP-MA nanocomposites were synthesized by melting intercalation. Small angle X-ray method was used to investigate the changes of interlayer distance of OMMT in the nanocomposites. The thermal properties were tested via DSC and TGA. Microstructure of the nanocomposites was detected by TEM. The results show that with increasing amount of OMMT, linear thermal expansion coefficient of PP-R/OMMT nanocomposites decreases and thermal decomposition temperature rises. With increasing amount of PP-MA, thermal decomposition temperature of PP-R/OMMT/PP-MA nanocomposites rises initially and decreases afterwards.