Choi, Seung-Sock Lee, Albert S. Lee, He Seung Choi, Dong Hoon Hwang, Seung Sang Baek, Kyung-Youl 2024-01-20T17:03:01Z 2024-01-20T17:03:01Z 2021-09-05 2011-05 1542-1406 https://pubs.kist.re.kr/handle/201004/130369 Well-defined hybrid polymers consisting of organic polymers grafted from inorganic backbone were synthesized by atom transfer radical polymerization (ATRP). Ladder-like structured polysilsesquioxane functioned as both ATRP initiator and hard inorganic backbone, while the organic polymers grafted were hard styrene and soft n-butyl acrylate. Ladder-like structured poly(chloromethylphenylsilsesquioxane) (LCMPSQ) was synthesized using sequential two-step reactions with (-chloromethyl)phenyltrimethxysilane as a monomer in one bath in the presence of K2CO3 as a base catalyst (Mw=6,000). Obtained LCMPSQ was then used as a multi-functional macroinitiator for graft polymerization of styrene (St) or/and n-butyl acrylate (nBA) monomers via ATRP using a CuCl catalyzed system, which gave three types of hybrid graft polymers: poly(styrene-g-silsesquioxane) (PS-g-PSQ), poly(nBA-g-silsesquioxane) (PnBA-g-PSQ) and poly(styrene-ran-nBA-g-silsesquioxane) (PS/nBA-g-PSQ). The hybrid graft polymers were prepared with various organic/inorganic weight fractions by changing the molecular weights of the organic graft polymers, which showed narrow molecular weight distributions (PDI1.4) on less than 50% of the polymerization conversion. English TAYLOR & FRANCIS LTD TRANSFER RADICAL POLYMERIZATION ATRP Synthesis of Ladder-Like Polysilsesquioxane with Well-Defined Graft Polymers Article 10.1080/15421406.2011.566122 1 MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.539, pp.174 - 183 MOLECULAR CRYSTALS AND LIQUID CRYSTALS 539 174 183 scie scopus 000290678400028 2-s2.0-79957626280 Chemistry, Multidisciplinary Crystallography Materials Science, Multidisciplinary Chemistry Crystallography Materials Science Article TRANSFER RADICAL POLYMERIZATION ATRP Atom transfer radical polymerization (ATRP) graft polymerization organic-inorganic hybrid copolymers polysilsesquioxane