Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/90578
Title: Implantation of poly(ethyl acrylate) in mesoporus poly(styrene-co- divinylbenzene) microspheres as a particulate sound absorbent
Authors: Ng, Y.H.
Hong, L. 
Issue Date: 2004
Citation: Ng, Y.H.,Hong, L. (2004). Implantation of poly(ethyl acrylate) in mesoporus poly(styrene-co- divinylbenzene) microspheres as a particulate sound absorbent. Materials Research Society Symposium Proceedings 856 : 97-102. ScholarBank@NUS Repository.
Abstract: Porous microspheres of poly(styrene-co-divinylbenzene) (SD) have been synthesized by suspension polymerization. They present a narrow porosity gap (21-24%) and a mean pore-radius range (106-117 Å). The mesoporous voids are then made use as the polymerization reactor for ethyl acrylate (EA), and as a result of the embedded polymerization, linear EA formed is trapped inside the individual particles (SD-EA), and its Tg is brought up to as high as the ambient temperature. Two specific loadings of EA were attained: 11% and 28% by weight. The acoustic absorption behaviors of SD-EA and SD microspheres are assessed by the attenuation coefficient (α = IAttenuated/I Incidence), in which the incident acoustic waves are two arbitrary audio frequency bands, 100-1000 Hz and 4000-5000Hz. In contrast to porous SD microspheres, SD-EA microspheres apparently relax the incident frequencies and attenuate more effectively the higher frequency sound waves. The maximum attenuation level (a) of SD-EA absorbent is about 80% (dB). It was found that the higher EA loading could improve rather slightly the attenuation level in the higher frequency range. © 2005 Materials Research Society.
Source Title: Materials Research Society Symposium Proceedings
URI: http://scholarbank.nus.edu.sg/handle/10635/90578
ISBN: 155899808X
ISSN: 02729172
Appears in Collections:Staff Publications

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