Slightly Cross-Linked Polyrotaxanes Made by Linking Α-Cyclodextrins Entrapped in Polyrotaxanes Using Hexamethylene Diisocyanate

Editor(s)

Ji, Guozhen and Ma, Shenming

Abstract

In this study polyrotaxane (PR)-based triblock copolymers were first synthesized via the atom transfer radical polymerization (ATRP) of N-isopropylacrylamide initiated with the self-assembly of a distal 2-bromoisobutyryl end-capped Pluronic 17R4 with a varying amount of α-cyclodextrins (α-CDs) in the presence of CuCl/PMDETA at 25°C in aqueous solution. the α-CDs entrapped on the copolymer chain were then linked with hexamethylene diisocyanate to give rise to novel slightly cross-linked polyrotaxanes (SCPRs) in DMF at 45°C. the structures of the PR-based triblock copolymers and SCPRs were characterized by ¹H NMR, ¹³C CP/MAS, GPC and TGA analyses. the number-average molecular weight of the resulting SCPRs was nearly three and five times of their precursor after linking with a low polydispersity index range of 1.08-1.28. the thermo-responsive transition of both PR-based supramolecular polymers in aqueous solution was demonstrated by turbidity measurements and the self-aggregated morphologies were also evidenced by TEM observations.

Department(s)

Mechanical and Aerospace Engineering

Keywords and Phrases

α-Cyclodextrin; Polyrotaxane; ATRP; Poly(N-Isopropylacrylamide); Hexamethylene Diisocyanate

International Standard Serial Number (ISSN)

1001-604X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2012 Wiley-VCH Verlag, All rights reserved.

Publication Date

01 Jan 2012

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