Modification of natural rubber latex in the presence of vinyl monomers by gamma radiation hevea

Mazam M.S., . and Makunchi K., . and Hagiwara M., . Modification of natural rubber latex in the presence of vinyl monomers by gamma radiation hevea. pp. 214-222. ISSN 0035-953X

Glicidyl methyl methacrylate (GMA) hydroxyl ethyl methyl methacrylate (HEMA) and diethyl amino methyl methacrylate (DE) have been copolymerised in natural rubber (NR) latex by gamma radiation. Since ammoniated latex was used epoxide ring opening reaction of the GMA occurred. Attempts to preserve the epoxide group by addition of acetic acid or formaldehyde to remove ammonia resulted in poor radiation stability of the polymer latex. The percentage of the homopolymer formed generally increased with monomer concentration while in the DE-NR copolymer. In the case of HEMA-NR copolymer was higher than that for DE-NR system the percentage of homopolymer poly DE decreased with monomer concentration. The physical properties of the copolymers were compared with those of NR dry films whose latices had been irradiated at various doses. There was enhancement of the tensile strength of NR in the presence of the polymerised monomers

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Abstract

Glicidyl methyl methacrylate (GMA) hydroxyl ethyl methyl methacrylate (HEMA) and diethyl amino methyl methacrylate (DE) have been copolymerised in natural rubber (NR) latex by gamma radiation. Since ammoniated latex was used epoxide ring opening reaction of the GMA occurred. Attempts to preserve the epoxide group by addition of acetic acid or formaldehyde to remove ammonia resulted in poor radiation stability of the polymer latex. The percentage of the homopolymer formed generally increased with monomer concentration while in the DE-NR copolymer. In the case of HEMA-NR copolymer was higher than that for DE-NR system the percentage of homopolymer poly DE decreased with monomer concentration. The physical properties of the copolymers were compared with those of NR dry films whose latices had been irradiated at various doses. There was enhancement of the tensile strength of NR in the presence of the polymerised monomers

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Item Type:	Article
Additional Information:	6 tables; 7 ref. Summary (En)
AGROVOC Term:	HEVEA BRASILIENSIS
AGROVOC Term:	LATEX
AGROVOC Term:	RADIACION GAMMA/ ANALISIS QUIMICO
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:53
URI:	http://webagris.upm.edu.my/id/eprint/18375

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