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Preparation and properties of poly(imide siloxane) segmented copolymer/silica hybrid nanocomposites
Author(s) -
Liaw WenChang,
Chen KuanPin
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.26319
Subject(s) - siloxane , materials science , nanocomposite , copolymer , polymer chemistry , polyimide , imide , thermal stability , fourier transform infrared spectroscopy , hybrid material , polymer , chemical engineering , composite material , nanotechnology , layer (electronics) , engineering
A series of Poly(imide siloxane) (PIS)/silica (SiO 2 ) hybrid nanocomposites with C‐Si covalent bonding between the homogeneous PIS copolymer and SiO 2 have been successfully synthesized. The PIS copolymer synthesized in this study is characterized by the coexistence of two segments: the polyimide segment and polydimethyldiphenylsiloxane segment, and the latter are specially featured with the introduction of a diphenyl group for improved homogeneity. The PIS/SiO 2 hybrid nanocomposites were prepared from 3,3′,4,4′‐bezonphenone tetracarboxylic dianhydride (BTDA), 2‐2′‐bis[4(3‐aminophenoxy)phenyl] sulfone ( m ‐BAPS), and vinyl‐containing α,ω‐bis‐(aminopropyl)polydimethyldiphenyl siloxane (APPPVS) oligomer to form vinyl siloxane‐containing poly(amic acid) (PAAVS). This copolymer was further reacted with trimethoxyvinylsilane (TMVS), 2,2′‐azobis‐isobutyronitrile (AIBN), and tetraethoxysilane (TEOS). The PIS/SiO 2 hybrid nanocomposites exhibited a series of properties unlike traditional composites, and the nano sized inorganic particles have resulted in a transparent hybrid when the SiO 2 content was less than 12 wt %. The Young's modulus and tensile strength of the PIS/SiO 2 hybrid nanocomposites increased with increasing SiO 2 content, whereas, the elongation at break was only slightly affected. The structure of the hybrids was characterized by FTIR, 29 Si‐NMR, 1 H‐NMR, and 13 C‐NMR, as well as SEM and TEM. The thermal properties of the PIS/SiO 2 hybrid nanocomposites were investigated with DSC, TGA, and DMA studies. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007