Synthesis of low polydisperse isotactic poly(N-isopropylacrylamide)s in environment-friendly and less toxic methanol-water mixtures by RAFT polymerization

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• 作者：CHANDRA SEKHAR BISWAS ; KHEYANATH MITRA ; SHIKHA SINGH…
• 关键词：Poly(N ; isopropylacrylamide) ; isotacticity ; RAFT polymerization ; methanol ; water mixture
• 刊名：Journal of Chemical Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：128
• 期：3
• 页码：415-420
• 全文大小：415 KB
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• 作者单位：CHANDRA SEKHAR BISWAS (1) (2)
  KHEYANATH MITRA (1)
  SHIKHA SINGH (1)
  BISWAJIT RAY (1)
  
  1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India
  2. Nanshan District Key Lab for Biopolymers and Safety Evaluation, College of Materials Science and Engineering & Optoelectronic Engineering Postdoctoral Center, Shenzhen University, 518060, Shenzhen, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Chemistry
  
• 出版者：Springer India
• ISSN：0973-7103

文摘

Poly(N-isopropylacrylamide)s (PNIPAM) with low polydispersity and different isotacticity have been synthesized successfully in different compositions of environment-friendly and less toxic methanol-water mixtures by RAFT polymerization in the presence of 0.1 M Yttrium trifluoromethanesulfonate [Y(OTf) ₃]. The reactions were successful with high yield in the solvent compositions having mole-fraction of methanol (x _m) at or above 0.31. Molecular weights were found to be in between 2.78 × 10 4 – 5.7 × 10 4 and polydispersity index (M _w/ M _n= 1.11 – 1.37) was close to unity. Isotacticity [meso diad (m), %] of the polymers increased from 55 to 86% with the increase in the x _m value from 0.31 to 1.0. The lower critical solution temperature (LCST) of the formed PNIPAMs in water decreased with the increase in their isotacticity.