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Titolo:
Synthesis and characterization of polyimides containing naphthalene pendant group and flexible ether linkages
Autore:
Wang, CS; Leu, TS;
Indirizzi:
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan Natl Cheng Kung Univ Tainan Taiwan 701 ept Chem Engn, Tainan 701, Taiwan Yung Ta Jr Coll Technol & Commerce, Dept Chem Engn, Ping Tung 900, Taiwan Yung Ta Jr Coll Technol & Commerce Ping Tung Taiwan 900 Tung 900, Taiwan
Titolo Testata:
POLYMER
fascicolo: 10, volume: 41, anno: 2000,
pagine: 3581 - 3591
SICI:
0032-3861(200005)41:10<3581:SACOPC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
AROMATIC TETRACARBOXYLIC DIANHYDRIDES; SOLUBLE POLYIMIDES; BIS(ETHER ANHYDRIDE)S; POLY(ETHER IMIDE)S; BISMALEIMIDE; DIAMINES; 1,5-BIS(4-AMINOPHENOXY)NAPHTHALENE; DERIVATIVES; BEHAVIOR; POLYMER;
Keywords:
pendant group; flexible ether linkages; solid state imidization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, CS Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan Natl Cheng Kung Univ Tainan Taiwan 701 Engn, Tainan 701, Taiwan
Citazione:
C.S. Wang e T.S. Leu, "Synthesis and characterization of polyimides containing naphthalene pendant group and flexible ether linkages", POLYMER, 41(10), 2000, pp. 3581-3591

Abstract

A series of novel polyimides containing naphthalene pendant moieties were prepared from various diamines (including bis(4-amino-3,5-dimethylphenyl)naphthylmethane 1, bis(4-aminophenoxy-3,5-dimethylphenyl)naphtyhlmethane 4, and bis(4-aminophenoxy-3,5-dimethylphenyl)methane 5) with various aromatic tetracarboxylic dianhydrides via both two-step and one-step methods. All polyimides, except 8(5a-d), were readily soluble in common organic solvent, such as chloroform. Differential scanning calorimetry (DSC) revealed that thenaphthalene bearing diamine monomers had a low entropy, and formed amorphous polyimides. They retained high moduli even at high temperatures by DMA, and had measured coefficients of thermal expansion (CTEs) in the range of 46.86-67.14ppm by TMA. The glass transition temperature (Tg) Of all polyimides were found to be 268-294 degrees C, 298-326 degrees C and 270-315 degrees C, respectively by DSC, DMA, and TMA. Thermogravimetric analyses indicated that the polymers were fairly stable up to 489-571 degrees C (10 wt% lossin N-2). They had a tensile strength in the range of 56-97 MPa, and elongations to break of around 3%. These polyimide films have dielectric constants ranging from 2.71 to 3.28 with moisture absorptions of less than 0.98%. (C) 2000 Elsevier Science Ltd. All rights reserved.

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Documento generato il 14/11/18 alle ore 03:11:03