聚甲基丙烯酸甲酯/纳米SiO_2复合粒子的制备与表征  

Preparation and Characterization of Poly(methyl methacrylate)/Nano-silica Composite Particles

作　　者：张涛[1] 徐立新[2] 杨肃宁[2] 包永忠[1] 黄志明[1] 

机构地区：[1]浙江大学聚合反应工程国家重点实验室,浙江杭州310027 [2]锦西化工研究院,辽宁葫芦岛125001

出　　处：《中国塑料》2006年第11期45-48,共4页China Plastics

摘　　要：采用甲基丙烯酸-3-甲氧基硅丙酯(MPS)对分散于甲基丙烯酸甲酯(MMA)中的纳米SiO_2粒子进行偶联改性,得到了表面改性的纳米SiO_2单体分散液,用原位悬浮聚合方法制备了不同SiO_2含量的PMMA/纳米SiO_2复合粒子。通过红外光谱、透射电镜、差示扫描量热分析和热重分析等方法对制备的纳米复合粒子进行了表征,结果表明,纳米SiO_2粒子在PMMA中分散良好；MMA可通过与MPS的共聚而有效地接枝到SiQ_2粒子表面,当SiO_2含量为6．6%(质量分数,下同)、MPS用量为0．06 g/g SiO_2时,其接枝率可达73．8%；同时,纳米SiO_2的引入可提高PMMA的耐热性能,当SiO_2含量为14．7%时,其玻璃化转变温度和最大热分解速率时的温度分别提高了11．8℃和18．8℃。The nano-sized silica particles were modified with 3-（trimethoxysilyl）propyl methacrylate （NIPS） and well dispersed in methyl methacrylate （MMA）, from which poly（methyl methacrylate）/ nano-silica composite particles were prepared via in situ suspension polymerization. The nanocomposite particles were characterized using Fourier transformed infrared spectroscopy, transmission electron microscopy, differential scanning calorimetry, and thermal gravimetric analysis, The nano-silica particles were well dispersed in polymer matrix and poly（methyl methacrylate） molecules were effectively grafted onto silica surface via the copolymerization between MMA and grafted MPS. When SiO2 content and MPS amount was 6.6 % and 0.06 g/g SiO2, respectively, the grafted fraction of PMMA reached 78.3 %. The introduction of nano-silica into PMMA improved the heat-resistance of PMMA. When SiO2 content was 14.7 %, the glass temperature and the temperature of maximum degradation rate were increased by 11.8 ℃ and 18.8 ℃, respectively.

关 键 词：聚甲基丙烯酸甲酯 纳米二氧化硅 原位悬浮聚合 接枝 

分 类 号：TQ316.3[化学工程—高聚物工业]