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Titolo:
Low dielectric polyimide/poly(silsesquioxane)-like nanocomposite material
Autore:
Tsai, MH; Whang, WT;
Indirizzi:
Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan Natl Chiao Tung Univ Hsinchu Taiwan 300 Sci & Engn, Hsinchu 300, Taiwan
Titolo Testata:
POLYMER
fascicolo: 9, volume: 42, anno: 2001,
pagine: 4197 - 4207
SICI:
0032-3861(200104)42:9<4197:LDPNM>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOL-GEL PROCESS; VAPOR-DEPOSITION POLYMERIZATION; SILICA HYBRID MATERIALS; COUPLING AGENTS; POLYIMIDE FILMS; CONSTANT; POLY(SILSESQUIOXANE); MICROSTRUCTURE; ALKOXYSILANE; COMPOSITES;
Keywords:
PI/PSSQ-like; nanocomposite; low dielectric;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Whang, WT Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 300, Taiwan Natl Chiao Tung Univ Hsinchu Taiwan 300 n, Hsinchu 300, Taiwan
Citazione:
M.H. Tsai e W.T. Whang, "Low dielectric polyimide/poly(silsesquioxane)-like nanocomposite material", POLYMER, 42(9), 2001, pp. 4197-4207

Abstract

A new type of low dielectric polyimide/poly(silsesquioxane)-like (PI/PSSQ-like) hybrid nanocomposite material is successfully prepared from the polyimide (ODA-ODPA) precursor containing phenyltrialkoxysilane IPTS) at two chain ends and monoaryltrialkoxysilane with a self-catalyzed sol-gel process. We employ p-aminophenyltrimethoxysilane (APTS) to provide bonding between the PTS and ODPA-ODA phase, It is shown by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) that the PSSQ-like domain sizes with uniform size are fairly well separated in the hybrid films. The silica domain sizes of 5000-PIS and 5000-PIS-50-PTS films are in the range of 30-100 nm, of 5000-PIS-100-PTS and 10000-PIS-100-PTS in the range of 80-200 and 300-600 nm, respectively. The dielectric constant can be 2.79 for 5000-PIS-140-PTS with fairly good mechanical properties. The PI/PSSQ-like hybridfilms have higher onset decomposition temperature and char yield in thermogravimetric analysis (TGA) and higher T-g in differential scanning calorimetry (DSC) than the pure PI. Moreover, the PI/PSSQ-like hybrid films have excellent transparency even under high PTS content. In the series of X-PIS hybrid films, the coefficient of thermal expansion (CTE) below T-g increases with the PI block chain length, but in the series of X-PIS-y-PTS films, it slightly increases with the PTS content. However, above T-g the CTE of X-PIS and X-PIS-24-PTS is much lower than that of the pure PI. The dielectric constant and water absorption of X-PIS-V-PTS films decrease with the PTS content because of the higher free volume and hydrophobicity. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 20:59:48