Grafting of Poly(2â€“hydroxyethyl methacrylate) on Natural Rubber (NRâ€“gâ€“PHEMA): Characterizations and Water Sorption Selectivity of NRâ€“gâ€“PHEMA Membranes
AbstractPoly(2â€“hydroxyethyl methacrylate) (PHEMA) was grafted onto NR latex particles employing emulsion polymerization technique. Grafting efficiency (%GE) of PHEMA on NR particles was found to increase with increasing 2â€“hydroxyethyl methacrylate monomer (HEMA). Differently, %GE increased rapidly at low initiator concentrations before leveling off at higher concentrations. The NRâ€“gâ€“PHEMA latex was cast into a thin membranes. The membranes were subjected to the tensile testing. The Youngâ€™s modulus of NRâ€“gâ€“PHEMA membrane was found to improved as %GE increased in contrast to the elongation at break. Revealing by DSC, the states of water in the NRâ€“gâ€“PHEMA membranes appeared as the free water and nonâ€“freezing bound water and both increased with %GE. Swelling behavior of NRâ€“gâ€“PHEMA membranes in waterâ€“acetone mixtures was investigated. The membrane swelling showed a nonâ€“ideal behavior where a maximum swelling degree was found at certain concentrations of waterâ€“acetone mixtures. The water sorption selectivity of the membranes was enhanced when increasing %GE for low water content in the waterâ€“acetone mixtures. However, as increasing water content, the water sorption selectivity was declined.
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