화학공학소재연구정보센터
Journal of Adhesion, Vol.61, No.1, 27-36, 1997
Modification of polychloroprene by graft copolymerization and its application as an adhesive
Graft copolymerization of ethyl acrylate (EA) and methyl methacrylate (MMA) onto polychloroprene (PCP) were carried out in toluene using benzoyl peroxide (BPO) as an initiator. The polychloroprene-g-poly (ethyl acrylate) (PCP-g-P(EA)) and polychloroprene-g-poly (methyl methacrylate) (PCP-g-P(MMA)) were isolated from the homopolymers of poly(ethyl acrylate) (P(EA)) and poly (methyl methacrylate) (P(MMA)) by a selective solvent extraction technique using diisopropyl ether and acetic acid as solvents, respectively. The infrared (IR) spectra of PCP-g-P(EA) and PCP-g-P(MMA) showed an absorption band at 1730 cm(-1), a characteristic of the carbonyl band (> C=O) of P(EA) or P(MMA) which is not present in PCP. The NMR spectrum of PCP-g-P(EA) copolymer showed the --OCH2 proton peak at 4.12 ppm, the methylene proton peak at 2.28 ppm and the methyl proton peak at 1.25 ppm. The NMR spectrum of PCP-g-P(MMA) copolymer shows the alpha--CH3 proton at 0.95 ppm and -OCH3 proton at 3.5 ppm. The IR and NMR studies on the graft copolymer showed the occurrence of grafting. The mechanism of the grafting seems to be by chain transfer as evidenced by the decrease in chlorine content of the graft copolymers. These graft copolymers were blended with tackifier and filler for adhesive applications. The peel and shear strength of the above adhesives with respect to upper leather to sole leather were investigated.