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Title: Effect of -C(CF3)2- on the surface energy of main-chain liquid crystalline and crystalline polymers
Authors: Ma, K.-X.
Chung, T.-S. 
Issue Date: 17-May-2001
Citation: Ma, K.-X., Chung, T.-S. (2001-05-17). Effect of -C(CF3)2- on the surface energy of main-chain liquid crystalline and crystalline polymers. Journal of Physical Chemistry B 105 (19) : 4145-4150. ScholarBank@NUS Repository.
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), acetoxyacetanilide (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 easily in 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 acid system.
Source Title: Journal of Physical Chemistry B
ISSN: 10895647
DOI: 10.1021/jp003103c
Appears in Collections:Staff Publications

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