title: Absorption behavior of poly(methyl methacrylate)-multiwalled carbon nanotube composites: effects of UV irradiation.
abstract: Understanding the effects of carbon nanotubes (CNTs) and ultraviolet (UV) irradiation on solvent transport in polymers is of practical importance for the applications of polymer-CNT composites in electronics and photonics. The transport behavior of methanol in poly(methyl methacrylate)-multiwalled carbon nanotube (PMMA-MWCNT) composites with and without UV light irradiation has been studied. The anomalous transport has been investigated as a function of the weight percentage of MWCNTs and UV dose in the temperature range of 30-50 °C. The anomalous transport consists of Case I (controlled by concentration gradient) and Case II (controlled by stress relaxation) transport; both UV irradiation and the addition of MWCNTs in PMMA enhance the transport of methanol. The activation energies for Case I and Case II transport decrease with the increase of UV dose for the PMMA-MWCNT plates with the same weight percentage of MWCNTs. Without UV irradiation, the activation energy for Case I transport of methanol decreases with the increase of the weight percentage of MWCNTs, and the activation energy for Case II transport increases with the increase of the weight percentage of MWCNTs.
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. sblee@mx.nthu.edu.tw.
authors.forename: Je-Chuan
authors.initials: JC
authors.lastname: Hsu
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Wenxin
authors.identifier: http://orcid.org/0000-0003-0953-8686
authors.initials: W
authors.lastname: Cao
authors.affiliation: Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Fuqian
authors.initials: F
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, Feng-Chia University, Taichung, Taiwan.
authors.forename: Tsong-Jen
authors.initials: TJ
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan. sblee@mx.nthu.edu.tw.
authors.forename: Sanboh
authors.identifier: http://orcid.org/0000-0001-5947-8189
authors.initials: S
authors.lastname: Lee