Synthesis and Characterization of Amphiphilic Block Copolymer by Block Copolymerization of Butadiene and Acrylamide using Macroazoinitiator

Bajpai, Anjali; Dixit, Neeraj

doi:10.1080/10601320701407938

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…It is well known that a number of techniques for the preparation of block copolymers have been developed hitherto (1)(2)(3)(4)(5)(6). Among them, the application of sequential free radical initiator, macro-initiators or macro-coinitiators with active functional groups bound on their ends is a simple and favorable alternative to prepare block copolymer under mild conditions.…”

Section: Introductionmentioning

confidence: 99%

PMMA-containing ITX Residues and its Initiation for Synthesizing PMMA-b-PSt Copolymer

Meng

Liu

Yang

2009

Journal of Macromolecular Science, Part A

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In virtue of the reversible coupling and cleaving mechanism involved isopropylthioxanthone (ITX), a precursor of poly(methyl methacrylate) ended with ITX residues (PMMA-ITXH) was firstly synthesized through the photopolymerization of methyl methacrylate (MMA) initiated by a binary system of ITX and ethyl-p-dimethyl amino benzoate (EDAB), and secondly, applying this precursor as a macroinitiator, block copolymer of poly(methyl methacrylate) and polystyrene (PMMA-b-PSt) was produced through a thermal activated radical polymerization of styrene (St) at a temperature above 80 • C. The content of incorporation of the reduced ITX groups in the precursor was estimated by UV-vis spectrum analysis and the results indicated that it was greatly influenced by the ITX concentration in system. The presence of EDAB could promote the polymerization and result in high monomer conversions and low molecular weight of polymers with wide distributions, but had no evident effect on the incorporation of reduced ITX moieties in polymer. Furthermore, more monomer supplied in system was advantageous for the production of high molecular weight of polymers and provided apparently low content of reduced ITX residues in polymer. Using a selected precursor of PMMA-ITXH with a moderate level of reduced ITX residues, molecular weight and its distribution, the bulk polymerization of St was initiated. FTIR spectrum analysis and GPC measurement confirmed the formation of block copolymer of PMMA-b-PSt.

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