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Solid‐state microcellular high temperature vulcanized (HTV) silicone rubber foam with carbon dioxide
Author(s) -
Yang Qian,
Yu Haitao,
Song Lixian,
Lei Yajie,
Zhang Fengshun,
Lu Ai,
Liu Tao,
Luo Shikai
Publication year - 2017
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.44807
Subject(s) - silicone rubber , materials science , vulcanization , composite material , thermal diffusivity , silicone , natural rubber , blowing agent , gaseous diffusion , saturation (graph theory) , chemical engineering , thermodynamics , fuel cells , physics , mathematics , combinatorics , polyurethane , engineering
A series of microcellular high temperature vulcanized (HTV) silicone rubber foams were prepared using CO 2 as a physical blowing agent. Rheological properties, gas diffusive behavior, and foaming parameters of silicone rubber were investigated. The results show that saturation pressure has a significant effect on the diffusivity of CO 2 in HTV silicone rubber matrix. The gas concentration and diffusivity increase from 2.45 wt % to 3.24 wt %, and from 1.62 × 10 −5 cm 2 /s to 7.83 × 10 −5 cm 2 /s as the saturation pressure increases from 2 MPa to 5 MPa, respectively. The value of the gas diffusivity in HTV silicone rubber is almost 1000 times higher than that of the gas diffusivity in polyetherimide (PEI) matrix. Additionally, microcellular HTV silicone rubber foams with the smallest cell diameter of 9.8 μm and cell density exceeding 10 8 cells/cm 3 are achieved. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44807.