Novel functional polymers: Poly(dimethylsiloxane)–polyamide multiblock copolymer. IV. Gas permeability and thermomechanical properties of aramid–silicone resins

✍ Scribed by Takeo Matsumoto; Yasumi Koinuma; Kazunori Waki; Akio Kishida; Tsutomu Furuzono; Ikuro Maruyama; Mitsuru Akashi

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 447 KB
• Volume: 59
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960214)59:7<1067::aid-app3>3.0.co;2-c

✦ Synopsis

Kagoshima 890, japan SYNOPSIS Poly(dimethylsi1oxane) (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 twophase 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 2 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 t 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.