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Novel functional polymers: Poly(dimethylsiloxane)–polyamide multiblock copolymer. IV. Gas permeability and thermomechanical properties of aramid–silicone resins
Author(s) -
Matsumoto Takeo,
Koinuma Yasumi,
Waki Kazunori,
Kishida Akio,
Furuzono Tsutomu,
Maruyama Ikuro,
Akashi Mitsuru
Publication year - 1996
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/(sici)1097-4628(19960214)59:7<1067::aid-app3>3.0.co;2-c
Subject(s) - materials science , aramid , polyamide , copolymer , silicone , polymer , solubility , composite material , elastomer , permeation , polymer chemistry , dynamic mechanical analysis , oxygen permeability , dimethylacetamide , chemical engineering , membrane , chemistry , organic chemistry , oxygen , biochemistry , fiber , engineering , solvent
Poly(dimethylsiloxane) (PDMS) and aromatic polyamide (aramid) multiblock copolymers (PASs) ranging from 26 wt % to 75 wt% in PDMS content were prepared and cast into transparent, ductile, and elastomeric films from N,N ′‐dimethylacetamide solutions. The gas permeation properties and dynamic thermomechanical properties of the PAS films were investigated. It was found that the PASs containing < 75 wt % of PDMS had two‐phase morphologies due to the great difference between the solubility parameters of the two components, in spite of the relatively low molecular weight of each segment. PASs containing ≥ 35 wt % of PDMS showed the PDMS continuous phase and interfacial mixing occurred clearly between the two phases at the higher PDMS contents. PAS containing ≥ 53 wt % of PDMS showed high enough gas permeability compared with conventional silicone rubbers. The gas permeation properties can be well predicted by the PDMS contribution to the continuous phase rather than by the modulus behaviors alone. © 1996 John Wiley & Sons, Inc.