Synthesis of block copolymers from end-functional oligomers prepared by allylic sulfide chain transfer

Date of Publication

2000

Degree Name

Master of Science in Chemistry

Subject Categories

Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Adviser

Clovia Isabel Z. Holdsworth

Defense Panel Chair

Gerardo C. Janairo

Defense Panel Member

Jaime Raul O. Janairo
Salvacion Cresidio

Abstract/Summary

Carboxy-terminated endfunctional polymers were successfully prepared by free radical chain transfer employing a novel chain transfer agent, a-((carboxymethyl)thiomethyl)acrylic acid (CMTMAA). Nuclear Magnetic Resonance (NMR) experiments confirmed efficient endfunctionalization of the polymers by CMTMAA consistent with the addition-fragmentation mechanism. The chain transfer agent was also evaluated to be effective in regulating the molecular weights (MW) of the polymers. The chain transfer ability of CMTMAA was quantitatively determined by measuring its chain transfer constant, Cx. The Cx values in homo- and copolymer systems ranged from 0.28 to 1.23. The relative reactivity of CMTMAA in copolymer systems was deduced from the Cx of the homopolymers and its corresponding kp value. CMRMAA was found to preferentially react with styrene (S) over (methyl methacrylate (MAN) and (methacrylonitrile) MMA propagating radicals.PS - block - PMAN and PS - block - PMMA were successfully prepared by the condensation reaction between hydroxy-terminated endfunctional oligomers synthesized in a previous study and selected samples of the carboxy-terminated oligomers synthesized in this study.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG03294

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

67 leaves ; 28 cm.

Keywords

Block copolymers; Oligomers; Polymerization; Polymers

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