The results showed that the obtained epoxidized natural rubber and epoxidized natural rubber/silica are liquid resistance which is expressed by high contact angle of water and poly(ethylene glycol) solution on the rubber surface. The bending strength of wood was improved by coating epoxidized natural rubber and epoxidized natural rubber/silica. The material with epoxy group content of 15 mol% is suitable for the protection of the wood surface. | Vietnam Journal of Science and Technology 56 (3B) (2018) 169-176 SOME CHARACTERISTICS OF EPOXIDIZED NATURAL RUBBER AND THE WOOD COATED BY IT Nguyen Thu Ha*, Nguyen Hong Quan, Cao Hong Ha, Nguyen Pham Duy Linh, Phan Trung Nghia School of Chemical Engineering, Hanoi University of Science and Technology, Dai Co Viet street, Hai Ba Trung district, Ha Noi * Email: Received: 11 July 2018; Accepted for publication: 9 September 2018 ABSTRACT Epoxidized natural rubber was prepared by epoxidation of natural rubber with fresh peracetic acid in latex stage. The epoxidized natural rubbers with epoxy group contents of 8, 15 and 27 mol% were prepared by adjusting the amount of fresh peracetic. The characterization of obtained materials was carried out through NMR spectroscopy, gel content determination and particle size measurement. The epoxidized natural rubber with various epoxy group contents were coated on the surface of the wood substrate by spin coating technique. The contact angle measurement and bending strength measurement were carried out for wood coated by epoxidized natural rubbers and epoxidized natural rubber/silica. The results showed that the obtained epoxidized natural rubber and epoxidized natural rubber/silica are liquid resistance which is expressed by high contact angle of water and poly(ethylene glycol) solution on the rubber surface. The bending strength of wood was improved by coating epoxidized natural rubber and epoxidized natural rubber/silica. The material with epoxy group content of 15 mol% is suitable for the protection of the wood surface. Keywords: epoxidized natural rubber, surface, contact angle, bending strength. 1. INTRODUCTION Natural rubber has been widely recognized to be suitable for coating application [1]. Due to the high adhesion, high hydrophobicity and superior water resistance, natural rubber is the ideal material to protect surface from severe environment condition. However, natural rubber is .
