【摘要】 通过原位自由基聚合方法制备了聚甲基丙烯酸甲酯(PMMA)以及含镓(Ga)质量分数为11.3%和13.5%的PMMA/Ga纳米复合材料.在玻璃化转变温度及以上温区,利用能量耗散技术研究PMMA/Ga纳米复合物的动力学弛豫行为,发现随着Ga含量的增加,复合物的α弛豫峰移向高温但峰高降低.此外,还定量研究了Ga含量对PMMA/Ga复合物的α′弛豫的影响,并作出了相应的解释.更多还原

【Abstract】 Two kinds of poly(methyl methacrylate) /gallium ( PMMA /Ga) nanocomposites with different Ga contents (11. 3% and 13. 5% ) were prepared by free radical polymerization. The relaxation dynamics of PMMA /Ga nanocomposite above the glass transition temperature has been investigated by mechanical spectroscopy. It was found that the peak temperatures of α relaxation of the nanocomposites increase with the increasing Ga content,but the peak heights of α relaxation decrease. Besides,the composition-dependent dynamics of the α′ relaxation in PMMA /Ga nanocomposites was also studied.更多还原