Synthesis and Characterization of Epoxidized Natural Rubber Latex with Different Epoxide Content

Hui WANG, Bo YANG

Abstract


To improve properties of natural rubber latex as water-barrier paperboard coatings, epoxidized natural rubbers (ENRs) were synthesized via in situ epoxidation from high ammonia concentrated natural rubber latex with formic acid and hydrogen peroxide. The reaction was performed at 45°C and 20°C. The obtained products were ENR20, ENR50, ENR70, and ENR85 according to the mole percentage of epoxide groups in ENR. ENRs were characterized by NMR Spectroscopy, DSC, DMTA and water vapor transmission rate determination. Epoxidization rate is faster at high temperature, but stable epoxide latex with high epoxide level can be obtained only at low temperature. The epoxidation reaction homogeneously takes place in latex and the Tg of ENRs increases almost linearly with epoxide content. Although hydrophility of polar epoxide chain results in high water vapor transition rate, ENR50 is the potential barrier coating material compared with other ENR samples.

Keywords


Epoxidation, Natural rubber latex, Water vapor transition rate


DOI
10.12783/dtmse/amsee2017/14258

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