Synthesis of Ladder-Like Polysilsesquioxane with Well-Defined Graft Polymers
- Authors
- Choi, Seung-Sock; Lee, Albert S.; Lee, He Seung; Choi, Dong Hoon; Hwang, Seung Sang; Baek, Kyung-Youl
- Issue Date
- 2011
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Atom transfer radical polymerization (ATRP); graft polymerization; organic-inorganic hybrid copolymers; polysilsesquioxane
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.539, pp.174 - 183
- Indexed
- SCIE
SCOPUS
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 539
- Start Page
- 174
- End Page
- 183
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/115061
- DOI
- 10.1080/15421406.2011.566122
- ISSN
- 1542-1406
- Abstract
- 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.
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