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Water transport in crosslinked 2‐hydroxyethyl methacrylate
Author(s) -
Chou K. F.,
Lee Sanboh,
Han C. C.
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11228
Subject(s) - materials science , methacrylate , sorption , irradiation , arrhenius plot , polymer chemistry , diffusion , polymer , (hydroxyethyl)methacrylate , swelling , gravimetric analysis , water transport , 2 hydroxyethyl methacrylate , ionization , analytical chemistry (journal) , chemical engineering , nuclear chemistry , composite material , chemistry , thermodynamics , chromatography , monomer , organic chemistry , activation energy , adsorption , ion , water flow , physics , environmental engineering , nuclear physics , engineering
Water transport in crosslinked 2‐hydroxyethyl methacrylate (HEMA) was investigated. Crosslinked HEMA was irradiated by gamma ray in vacuum for this study. The sorption data of de‐ionized water transport in crosslinked HEMA subjected to various gamma ray dosages are in excellent agreement with Harmon's model which accounts for Case I, Case II, as well as the anomalous transport processes. The diffusion coefficient for Case I transport and velocity for Case II transport satisfy the Arrhenius equation for all dosages. The transport process was exothermic and the equilibrium‐swelling ratio satisfied the van't Hoff plot. The pH value of de‐ionized water after the sorption/de‐sorption treatment of the irradiated crosslinked HEMA specimen was analyzed. The transmittance of irradiated crosslinked HEMA treated by de‐ionized water was also studied. The effect of irradiation on the polymer chains was revealed by the measurement of glass transition temperature and the quantitative determination of water structures in crosslinked HEMA hydrogel. The UV cut‐off wavelength of crosslinked HEMA shifted to longer wavelength side with increasing irradiation dosage, but the trend of transmittance after water treatment was opposite. The effect of specimen thickness on water transport was also studied.