摘要
考察了温度和纳米二氧化硅（SiO2）粒子含量对聚甲基丙烯酸甲酯（PMMA）／SiO2复合体系动态流变行为的影响。结果表明，不同温度下随着纳米SiO2粒子含量的增加复合体系均呈现弹性模量（G′）、损耗模量（G″）逐渐增加而损耗角正切（tanδ）逐渐减小的趋势。当纳米SiO2粒子含量较低即小于6％（体积分数，下同）时，复合体系在低频率下（0．01～0．10rad／s）的G′呈现随温度（190～210℃）增大而减小的正常行为；当纳米SiO2粒子含量超过6％时，复合体系在低频率下的G′随温度升高反而增大，而且此时tanδ出现显著的峰值和谷值。高填充体系中粒子在较高温度下活动性的提高以及粒子团聚结构的生成是复合体系在低频率区域弹性响应增大的可能原因。
Influences of temperature and filler nano-silica（SiO2） volume fraction on the dynamic rheological properties of poly （methyl methacrylate） （PMMA）/ SiO2 composites were investigated. The results show that the elastic modulus （G′） and loss modulus （G＂） increase as the volume fraction of nano-SiO2 increases while the loss tangent （tanδ） decreases at different temperature. As volume fraction of nano-SiO2 is below 6%, the G＇of composites at a low frequency region（0. 0140.10 rad/s）decreases while the temperature increases from 190 ℃ to 210℃, which is normal behavior. As volume fraction of nano-SiO2 is above 6 %, the G′ of composites at low frequency region increases while the temperature increases, and noticeable tanδ peak and valley appear. The increased elastic response of PMMA/SiO2 composites at a low frequency region may be ascribed to the higher mobility and aggregation of SiO2 particles at higher content of nano-SiO2 and temperature.
出处
《现代塑料加工应用》
CAS
北大核心
2009年第2期5-8,共4页
Modern Plastics Processing and Applications
基金
教育部科学技术研究重点项目资助(106133)
