摘要
利用可逆加成-断裂链转移(RAFT)活性自由基聚合合成了一系列分子量可控、分子量分布窄的甲基丙烯酸-3-三甲氧基硅丙酯(MPS)和N-异丙基丙烯酰胺(NIPAM)的嵌段共聚物,在水溶液中分散制备温敏性的含硅纳米粒子。保持疏水链段PMPS的长度恒定,改变亲水链段PNIPAM的长度,在不同pH的水溶液中进行实验,研究亲水链段长度、pH对聚合物的临界聚集浓度、纳米粒子的尺寸和形貌以及温度变化过程中的相分离行为的影响,得到尺寸较小、溶液稳定的温度响应性含硅纳米粒子,同时具有有机物和无机物的优良特点,在生物医学、化学催化、纳米反应器、染料涂料等多领域具有广泛的应用前景。
A series of molecular weight-controlled,narrow molecular weight distributions of 3-trimethoxysilyl methacrylate (MPS) and N-isopropyl acrylamide (NIPAM) block copolymers were synthesized by reversible addition-fragmentation chain transfer (RAFT) living radical polymerization.Temperature-sensitive siliconcontaining nanoparticle are prepared by dispersing in aqueous solution.With the same chain length of hydrophobic segment PMPS,by changing the chain length of hydrophilic segment PNIPAM and the pH of the water solutions,the critical aggregation concentrations,the diameters and morphologies of the nanoparticles,and the phase separation behavior happening in the process of temperature variation were studied.Thermo-responsive and spherical nanoparticles were attained.The nanoparticles possessed advantages of both organics and inorganics.And they may have wide applications in many fields such as biomedicine,chemical catalysis,nanoreactors,dyes,coatings and so on.
作者
赵小燕
单国荣
ZHAO Xiaoyan;SHAN Guorong(State Key Laboratory of Chemical Engineering,College of Chemical and Biochemical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China;Institute of Zhejiang University-Quzhou,Quzhou 324000,Zhejiang,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2019年第10期4080-4088,共9页
CIESC Journal
关键词
共聚物
硅烷
纳米粒子
PH
水解
polymers
silicane
nanoparticles
pH
hydrolysis
