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Grafting copolymerization of natural rubber with 2-hydroxyethyl methacrylate for plywood adhesion improvement

Author(s): Yoopadee Promdum | Pairote Klinpituksa | Jareerat Ruamcharoen

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 31;
Issue: 4;
Start page: 453;
Date: 2009;
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Keywords: natural rubber | emulsion polymerization | 2-hydroxyethyl methacrylate | adhesion property

The graft copolymer of natural rubber (NR) and 2-hydroxyethyl methacrylate (HEMA) was prepared by seeded emulsion polymerization using cumene hydroperoxide (CHP) and tetraethylene pentamine TEPA) as an initiator system. The structures of the copolymers were characterized by FT-IR and 1H-NMR spectroscopy techniques. The adhesion properties of NR-g-HEMA were examined. The effects of monomer concentration, initiator concentration, reaction temperature,reaction time and the agitation speed on grafting and grafting efficiency were investigated. It was found that the optimumconditions for preparing NR-g-HEMA when 5 phr of HEMA with 0.15mol% of initiator was used were 60oC for 90 min under agitation speed of 50 rpm. Furthermore, the adhesion properties to plywood of the graft copolymers are higher than those of original NR.
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