Maçon Anthony L B, Greasley Sarah L, Becer C Remzi, Jones Julian R
Department of Materials, Imperial College London, SW7 2AZ, London, UK.
School of Engineering and Materials Science, Queen Mary University of London, E1 4NS, London, UK.
Macromol Rapid Commun. 2015 Dec;36(23):2060-4. doi: 10.1002/marc.201500369. Epub 2015 Aug 19.
Reversible addition-fragmentation chain transfer (RAFT) polymerization and characterization of an alkoxysilane acrylamide monomer using a trithiocarbonate chain transfer agent are described. Poly(N-[3-(trimethoxysilyl)propyl]acrylamide) (PTMSPAA) homopolymers are obtained with good control over the polymerization. A linear increase in the molecular weight is observed whereas the polydispersity values do not exceed 1.2 regardless of the monomer conversion. Moreover, PTMSPAA is used as a macro-RAFT agent to polymerize N-isopropylacrylamide (NIPAM). By varying the degree of polymerization of NIPAM within the block copolymer, different sizes of thermoresponsive particles are obtained. These particles are stabilized by the condensation of the alkoxysilane moieties of the polymers. Furthermore, a co-network of silica and PTMSPAA is prepared using the sol-gel process. After drying, transparent mesoporous hybrids are obtained with a surface area of up to 400 m(2) g(-1).
描述了使用三硫代碳酸酯链转移剂进行的可逆加成-断裂链转移（RAFT）聚合反应以及一种烷氧基硅烷丙烯酰胺单体的表征。获得了具有良好聚合控制的聚（N-[3-(三甲氧基硅基)丙基]丙烯酰胺）（PTMSPAA）均聚物。观察到分子量呈线性增加，而无论单体转化率如何，多分散性值均不超过1.2。此外，PTMSPAA用作大分子RAFT剂来聚合N-异丙基丙烯酰胺（NIPAM）。通过改变嵌段共聚物中NIPAM的聚合度，可获得不同尺寸的热响应性颗粒。这些颗粒通过聚合物的烷氧基硅烷部分的缩合而稳定。此外，使用溶胶-凝胶法制备了二氧化硅和PTMSPAA的共网络。干燥后，获得了表面积高达400 m² g⁻¹的透明介孔杂化物。
