Preparation and identification of di-block copolymer composed of crystalline poly(ethylene oxide) and noncrystalline poly(vinyl acetate) with well-defined structure
✍ Scribed by Junlian Huang; Xiaoyu Huang; Wenbin Hu
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 381 KB
- Volume
- 198
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
A block copolymer of ethylene oxide (EO) and vinyl acetate (VAc) was prepared by sequential anionic and photo‐induced charge transfer polymerization (CTP) using UV sensible p‐aminophenoxy end groups on PEO (PEO~a~). The structure and composition of this block copolymer (PEO‐b‐PVAc) were identified in detail. The relationship between polymerization rate (R~p~) and the concentrations of benzophenone (BP) and monomer, and the effect of the concentration and molecular weight of PEO~a~ on the polymerization of VAc, are discussed; the relationship R~p~ ∝ [PEO~a~‐11000]^0.33^ [VAc]^0.28^ [BP]^0.47^ using benzene as a solvent was derived. The dependence of the thermal properties of PEO‐b‐PVAc on the length of the PVAc block is described. It turned out that the PEO and PVAc blocks are compatible.