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Synthesis and surface characterization of poly(methyl methacrylate)‐block‐polydimethylsiloxane copolymers from macroazoinitiator
Author(s) -
Feng Libang,
Fang Hongxia,
Zhou Shuxue,
Wu Limin,
You Bo
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.25940
Subject(s) - polydimethylsiloxane , copolymer , materials science , x ray photoelectron spectroscopy , transmission electron microscopy , methyl methacrylate , polymer chemistry , morphology (biology) , contact angle , chemical engineering , characterization (materials science) , surface energy , scanning electron microscope , poly(methyl methacrylate) , polymer , composite material , nanotechnology , biology , engineering , genetics
Poly(methyl methyacrylate)‐block‐polydimethylsiloxane (PMMA‐ b ‐PDMS) copolymers with various compositions were synthesized with PDMS‐containing macroazoinitiator (MAI), which was first prepared by a facile one‐step method in our lab. Results from the characterizations of X‐ray photoelectron spectroscopy (XPS), contact angle measurements, and atomic force microscopy (AFM) showed that the copolymer films took on a gradient of composition and more PDMS segments enriched at the film surfaces, which then resulted in the low surface free energy and little microphase separation at the film surfaces. By contrast, transmission electron microscopy (TEM) analysis demonstrated that distinct microphase separation occurred in bulk. Slight crosslinking of the block copolymers led to much steady morphology and more distinct microphase separation, in particularly for copolymers with low content of PDMS. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007