| 纳米SiO_2粒子锚固偶氮引发剂及接枝聚甲基丙烯酸甲酯 |
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| 引用本文： | 戚栋明,包永忠,黄志明,翁志学.纳米SiO_2粒子锚固偶氮引发剂及接枝聚甲基丙烯酸甲酯[J].高分子学报,2004(3):415-418. |
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| 作者姓名： | 戚栋明 包永忠 黄志明 翁志学 |
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| 作者单位： | 浙江大学高分子工程研究所,杭州,310027 |
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| 基金项目： | 浙江省重大科技攻关项目(编号 011101619) |
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| 摘 要： | 对纳米SiO2 粒子锚固偶氮引发剂 ,进而引发甲基丙烯酸甲酯聚合而制备聚甲基丙烯酸甲酯(PMMA) 纳米SiO2 复合粒子进行了研究 .纳米SiO2 先用环氧型硅烷偶联剂处理 ,再与偶氮二氰基戊酸发生缩合反应而锚固上偶氮引发剂 ,通过差示扫描量热和元素分析证明了引发剂在纳米SiO2 表面的锚固 .通过改性纳米SiO2 存在下MMA的乳液聚合 ,制备得到了接枝率为 2 3 2 %、接枝效率为 36 1%的PMMA 纳米SiO2 复合粒子 .经乳液聚合后 ,纳米SiO2 粒子团聚程度减小 ,在水相中分散稳定 .
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| 关 键 词： | 纳米SiO2 甲基丙烯酸甲酯 乳液聚合 偶氮二氰基戊酸 锚固 接枝 |
| 修稿时间： | 2003年6月9日 |
ANCHORING OF AZO INITIATOR AND GRAFTING OF POLY(METHYL METHACRYLATE) ONTO NANAOMETER SILICA |
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| QI Dongming,BAO Yongzhong,HUANG Zhiming,WENG Zhixue.ANCHORING OF AZO INITIATOR AND GRAFTING OF POLY(METHYL METHACRYLATE) ONTO NANAOMETER SILICA[J].Acta Polymerica Sinica,2004(3):415-418. |
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| Authors: | QI Dongming BAO Yongzhong HUANG Zhiming WENG Zhixue |
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| Abstract: | Anchoring of 4,4′-azobis(4-cyanopentanoic acid) (ACPA) onto nanometer silica and radical graft polymerization of methyl methacrylate (MMA) from the modified silica through emulsion polymerization were investigated.The anchoring of ACPA onto silica was achieved by treating of silica with glycidoxypropyl-trimethoxysilane and reacting with ACPA.The anchoring of ACPA was confirmed by DSC and element analysis.Poly(methyl methacrylate) (PMMA) was effectively grafted onto nanometer silica through the initiation of anchored ACPA during emulsion polymerization.The grafting percentage and efficiency of PMMA were 23.2% and 36.1% determined by TGA.Furthermore,the aggregation degree of the original nanometer silica was decreased by in-situ polymerization,and the stability of PMMA/nano-silica composite latex was good. |
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| Keywords: | Nanometer silica Methyl methacrylate Emulsion polymerization 4 4′-Azobis(4-cyanopentanoic acid) Anchor Graft |
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