Preparation and properties of chlorinated epoxidised natural rubber latex and its latex-based adhesive

Thitithammawong A., . and Ruttanasupa N., . and Nakason C., . Preparation and properties of chlorinated epoxidised natural rubber latex and its latex-based adhesive. pp. 19-34. ISSN 1511-1768

Chlorinated epoxidised natural rubber (CENR) was synthesised using epoxidised natural rubber (ENR) in its latex state with an in-situ chloride ion generating substance. The influences of the molar ratios of sodium hypochlorite/sodium chloride (NaOCl/NaCl) pH and the concentration of the NaOCl/NaCl and reaction time on the level of chlorine contents in the CENR molecules were investigated. FTIR observation showed the presence of a C-Cl band in the rubber structure upon chlorination of the ENR by mixing it with NaOCl and NaCl. The thermogravimetric analysis proved that chlorination provided the CENR with superior thermal stability than that of the ENR. The CENR latex was then formulated and compounded to prepare a latex-based adhesive. It was found that crosslink reactions generated by different vulcanisation systems caused different adhesive strengths in terms of shear strength and cleavage peel strength. Furthermore the adhesive exhibited higher shear strength than the commercial grade adhesives (i.e. Contact and Dragon) where comparable peel strengths were obtained. However both properties were relatively lower when compared with Diabond.

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Abstract

Chlorinated epoxidised natural rubber (CENR) was synthesised using epoxidised natural rubber (ENR) in its latex state with an in-situ chloride ion generating substance. The influences of the molar ratios of sodium hypochlorite/sodium chloride (NaOCl/NaCl) pH and the concentration of the NaOCl/NaCl and reaction time on the level of chlorine contents in the CENR molecules were investigated. FTIR observation showed the presence of a C-Cl band in the rubber structure upon chlorination of the ENR by mixing it with NaOCl and NaCl. The thermogravimetric analysis proved that chlorination provided the CENR with superior thermal stability than that of the ENR. The CENR latex was then formulated and compounded to prepare a latex-based adhesive. It was found that crosslink reactions generated by different vulcanisation systems caused different adhesive strengths in terms of shear strength and cleavage peel strength. Furthermore the adhesive exhibited higher shear strength than the commercial grade adhesives (i.e. Contact and Dragon) where comparable peel strengths were obtained. However both properties were relatively lower when compared with Diabond.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Sodium chloride
AGROVOC Term:	Latex
AGROVOC Term:	Hydrochloric acid
AGROVOC Term:	Chlorine
AGROVOC Term:	sodium
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/22988

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