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Poly( N ‐isopropylacrylamide) Brush Fabricated by Surface‐Initiated Photopolymerization and its Response to Temperature
Author(s) -
Jia Xinyan,
Jiang Xuesong,
Liu Rui,
Yin Jie
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900291
Subject(s) - poly(n isopropylacrylamide) , photopolymer , photoinitiator , brush , monolayer , materials science , x ray photoelectron spectroscopy , polymer chemistry , contact angle , ellipsometry , chemical engineering , composite material , polymerization , monomer , nanotechnology , thin film , polymer , copolymer , engineering
A well‐defined, high‐density poly( N ‐isopropylacrylamide) (PNIPAM) brush was fabricated through a novel and reliable strategy by the combination of the self‐assembly of a monolayer of dendritic photoinitiator and surface‐initiated photopolymerization. The whole fabrication process of the PNIPAM brush was followed by water contact angles, X‐ray photoelectron spectroscopy, and atomic force microscopy. Characterization of the PNIPAM brush, such as molecular weight and thickness determination, were measured by gel permeation chromatography, and ellipsometry, and the graft density was estimated. The temperature response of the PNIPAM brush was further investigated and the result verified the coil‐to‐globule transition of the PNIPAM chains in water from low to high temperature.