Use of 2-(6-mercaptohexyl) malonic acid to adjust the morphology and electret properties of cyclic olefin copolymer and its application to flexible loudspeakers

doi:10.1088/0964-1726/19/5/055007

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Title:	Use of 2-(6-mercaptohexyl) malonic acid to adjust the morphology and electret properties of cyclic olefin copolymer and its application to flexible loudspeakers
Authors:	Sheu, B. C.;Lin, C. C.;Fu, Y. H.;Lee, S. Y.;Lai, H. C.;Wu, R. S.;Liu, C. H.;Tsai, J. C.;Lin, S.
Contributors:	淡江大學化學學系
Keywords:	Additive concentrations;Charge storage;Cyclic olefin copolymers;Electret properties;Malonic acid;matrix;Micelle formation;Processing condition;Spin-coating process;Thin structure;Thin-film processing;Acids;Additives;Carboxylic acids;Coatings;Copolymerization;Electrets;Loudspeakers;Olefins;Organic polymers;Processing;Thin films;Polyetherimides
Date:	2010-05
Issue Date:	2013-08-08 14:43:35 (UTC+8)
Publisher:	Bristol: Institute of Physics Publishing Ltd.
Abstract:	Recent uses of flexible electret loudspeakers in futuristic applications have garnered much interest for these novel loudspeakers. In this paper, a novel thin film processing method was developed to improve the performance of an electret diaphragm. This paper discusses the relationship between the charge storage and the additive concentration. A cyclic olefin copolymer (COC) thin film containing an additive such as 2-(6-mercaptohexyl) malonic acid was prepared using a spin-coating process. Furthermore, attention was directed towards the processing conditions which were found to have an important role and are related to the self-assembly and micelle formation behavior of the additives in the COC. In the present study, thin films of 13 νm thickness were charged by a corona method. Compared with a reference thin film of pure COC, results indicated that when a 3497 mgkg -1 additive was added to the COC matrix, the obtained surface potential was 71% higher. Thus, the results show that a COC + additive thin film leads to a much improved charge storage. It appears to be an inexpensive and relatively easy way to form a thin structure for developing novel flexible electret loudspeakers.
Relation:	Smart Materials and Structures 19(5), 055007(9pages)
DOI:	10.1088/0964-1726/19/5/055007
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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