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A nanofoaming process and dielectric properties of polymethylphenylsilsesquioxane‐based nanofoams
Author(s) -
Hong Soo Man,
Hwang Seung Sang
Publication year - 2006
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.23809
Subject(s) - materials science , thermogravimetric analysis , thermal stability , phase (matter) , chemical engineering , thermal decomposition , polymer , dielectric , matrix (chemical analysis) , hybrid material , decomposition , polymer chemistry , composite material , organic chemistry , chemistry , nanotechnology , optoelectronics , engineering
We prepared polymethylphenylsilsesquioxane (PMPSQ) as an inorganic, thermally stable, matrix and poly‐ D , L ‐lactide‐1,6‐hexanediol (PDLLA‐1,6‐hexanediol) as a porogen material. PMPSQ was initially designed to obtain synergistic effects from polyphenylsilsesquioxane and polymethylsilsesquioxane. The PDLLA‐1,6‐hexanediol was chosen as a porogen since it has a much lower thermal stability when compared with PMPSQ. The initial decomposition temperature of the PMPSQ (458°C) was higher than the terminal decomposition temperature of PDLLA‐1,6‐hexanediol by 148°C, resulting in a broad processing window for the nanofoaming process. The broad window was utilized not only for optimization of the foaming condition, but for preparation of the nanofoamed PMPSQ without disruption in the structural stability of the matrix. Furthermore, hydroxyl end groups on PMPSQ and PDLLA‐1,6‐hexanediol played a role in the uniform and well‐distributed phase separation behavior. PMPSQ and PDLLA‐1,6‐hexanediol were investigated by 1 H NMR, GPC, and thermogravimetric analysis to characterize the properties of polymers and optimize the foaming condition. The inorganic/organic hybrids based on the PMPSQ and PDLLA‐1,6‐hexanediol were prepared and measured in terms of phase separation behavior and dielectric properties. In these hybrid systems, PMPSQ/PDLLA‐1,6‐hexanediol (85/15) exhibited the most uniform and the smallest nanofoam distribution in the continuous PMPSQ matrix. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4964–4971, 2006