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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
Published on: August 25, 2016
Discoloration Mechanisms of Natural Rubber and Its Control
Mingzhe Lv1,2, Lei Fang2, Heping Yu2
1Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Salaya Campus, Mahidol University, Phutthamonthon, Nakhon Pathom 73170, Thailand.
Abstract:
Color is an important indicator for evaluating the quality of natural rubber (NR). Light-colored standard rubbers are widely used in high-grade products and have high economic value. This paper first introduces the history and test standards of the standard light-colored rubber. The origin of color deepening in NR processing, color substances, and its biosynthetic pathway are reviewed. Then, the discoloration mechanism of NR is studied from the perspectives of enzymatic browning (caused by polyphenol oxidase and polyphenols) and non-enzymatic browning (including Maillard reaction and lipid oxidation). Finally, the strategies to control the discoloration of NR will be described.
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