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Titolo:
Effect of -C(CF3)(2)- on the surface energy of main-chain liquid crystalline and crystalline polymers
Autore:
Ma, KX; Chung, TS;
Indirizzi:
Inst Mat Res & Engn, Singapore 117602, Singapore Inst Mat Res & Engn Singapore Singapore 117602 ngapore 117602, Singapore Natl Univ Singapore, Dept Chem & Environm Engn, Singapore 119260, Singapore Natl Univ Singapore Singapore Singapore 119260 ngapore 119260, Singapore
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 19, volume: 105, anno: 2001,
pagine: 4145 - 4150
SICI:
1520-6106(20010517)105:19<4145:EO-OTS>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
URETHANE) BLOCK-COPOLYMERS; THIN-FILM POLYMERIZATION; CONTAINING SIDE-CHAINS; PERFLUOROALKYL; SEGREGATION; EVOLUTION; TENSIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Chung, TS Inst Mat Res & Engn, 3 Res Link, Singapore 117602, Singapore Inst Mat Res & Engn 3 Res Link Singapore Singapore 117602 apore
Citazione:
K.X. Ma e T.S. Chung, "Effect of -C(CF3)(2)- on the surface energy of main-chain liquid crystalline and crystalline polymers", J PHYS CH B, 105(19), 2001, pp. 4145-4150

Abstract

Novel fluorinated main-chain liquid crystalline/crystalline polymers were prepared through thin film polymerization. Two polymer systems were studied: one from 2,6-acetoxynaphthoic acid (ANA): acetoxy acetanilide (AAA), and 4,4'-(hexafluoroisopropylidene)bis(benzoic acid) (6F acid) and the other from ANA, hydroquinone diacetate (HQAT), and 6F acid. The surface energy was estimated using contact angles of water, glycerol, and diiodomethane. A small amount of -C(CF3)(2)- in the main chain lowered the surface energy, and the fluorocarbons were preferentially enriched at the air-polymer interface, causing low surface energy and large water contact angles. These results agreed with XPS data. Since the -O-Ar-O- unit in the HQAT moiety is more rigid than the -O-Ar-N- unit in the AAA moiety, LC texture formed more easilyin the ANA/HQAT/6F acid system than in the ANA/AAA/6F acid system. Contrarily, the fluorocarbons enriched more preferentially at the surface in the ANA/AAA/6F acid system than in the ANA/HQAT/6F acid system. Moreover, the hydrogen bonding originating from the amide group hindered further decrease of surface energy with an increase in 6F acid content in the ANA/AAA/6F acidsystem.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 09:05:22