음이온 리빙 중합을 이용한 별 모양 폴리부타디엔의 합성과 분석
- Title
- 음이온 리빙 중합을 이용한 별 모양 폴리부타디엔의 합성과 분석
- Authors
- 양진석
- Date Issued
- 2014
- Publisher
- 포항공과대학교
- Abstract
- Star polymer is a branched polymer characterized by multiple linear chains linked to a central core. The unique chain architecture of star polymers imparts interesting physical properties depending on the molecular parameters such as the number of arms, molecular weight and polydispersity, but it is not possible to prepare truly homogeneous polymers even with a current state-of-art synthetic method. Therefore, precise molecular characterization is necessary to address the physical properties of the branched polymer with respect to the molecular parameters of the polymers. Size exclusion chromatography (SEC) is the most widely adopted technique for molecular characterization of polymers, however, it cannot characterize star polymers precisely, in particular, branched polymers. In the chapter 1, we synthesized 4-arm star polymers using anionic polymerization and a tetravalent chlorosilane compound as a linker. We characterized the 4-arm star polybutadiene by SEC and temperature gradient interaction chromatography (TGIC) to figure out the byproducts and to devise an efficient way to acquire high-purity star polymers.In the chapter 2, the formation of a chlorosilane-linked polybutadiene star is reported. The precursor arm material was made using anionic polymerization in cyclohexane. Size exclusion chromatography using multi angle laser light scattering was utilized for characterization. The star PB was synthesized by adjusting the equivalent ratio both polymeric anion and linking agent, this experiment can be effectively synthesized star polymer which has major target number of arms. It was found that four-arm star as a major product is formed within a few miniute after the addition of the chlorosilane linking agent.
- URI
- http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001681490
https://oasis.postech.ac.kr/handle/2014.oak/2244
- Article Type
- Thesis
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.