Surface-Initiated Controlled Radical Polymerization from Silica Nanoparticles with High Initiator Density
Surface-Initiated Controlled Radical Polymerization from Silica Nanoparticles with High Initiator Density
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DOI：
10.1002/macp.201100625
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发表时间：
2012-03-16
影响因子：
2.5
通讯作者：
Abetz, Volker
中科院分区：
文献类型：
--
作者：
Chakkalakal, Golda Louis;Alexandre, Michael;Abetz, Volker
采用接枝接枝技术对二氧化硅纳米颗粒进行表面改性。通过多步反应来改变它们的表面性质。以(3-缩水甘油基丙基)三甲氧基硅烷(GPS)为偶联剂，固定原子转移自由基聚合(ATRP)引发剂。研究了纳米二氧化硅水悬浮液与GPS的接枝效率，以及与ATRP引发剂的偶联效率。为研究苯乙烯和甲基丙烯酸甲酯的聚合反应动力学，ATRP引发剂的溴化物浓度保持不变。研究了高转化率下的后果和颗粒大小分布。分析了聚合物改性颗粒的玻璃化转变温度行为和聚合物包覆二氧化硅颗粒的分散性质。
The surface of silica nanoparticles is modified using the grafting from technique. A multi-step reaction is conducted to modify their surface properties. (3-glycidoxypropyl) trimethoxysilane (GPS) is used as the coupling agent for the fixation of atom transfer radical polymerization (ATRP) initiator. The grafting efficiency of GPS mixed with aqueous suspension of silica nanoparticles is studied, followed by the coupling efficiency towards ATRP initiator. The bromide concentration of ATRP initiator is kept constant for comparative kinetic studies of styrene and MMA polymerizations. The consequences at high conversions and the particle size distribution are studied. The behaviour of the glass transition temperature of either polymer-modified particles and the nature of dispersion of polymer-coated silica particles are analyzed.