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Self‐crosslinkable hydroxylated natural rubber/carboxymethyl starch blend and its properties
Author(s) -
Chooprayoon Pajaree,
Boochathum Ploenpit
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47271
Subject(s) - vulcanization , materials science , natural rubber , thermal stability , formic acid , composite material , chemical engineering , starch , polymer chemistry , chemistry , organic chemistry , engineering
Self‐crosslinkable hydroxylated natural rubber (HNR) and carboxymethyl starch (CMS) was successfully prepared via in situ mixing of CMS slurry in HNR latex. The purpose of this work was to study the crosslinking of HNR using CMS as a novel crosslinker in order to reduce the use of sulfur vulcanizing agent and other toxic chemicals such as accelerator. Two systems with different HNR:formic acid:hydrogen peroxide ratios were prepared: 1:0.25:0.25, designated as HNR025, and 1:0.35:0.35, designated as HNR035. Well dispersion and distribution of CMS in the HNR025 matrix were obvious as imaged in scanning electron microscope micrographs. The resulting interfacial combination and ester bonding between HNR and CMS molecules were believed to enhance the mechanical properties and thermal stability of the HNR/CMS blends. It was remarkable that the determined crosslink densities of the HNR/CMS blends increased with the CMS loading and were corresponding to the improved mechanical properties. This self‐crosslinkable blend between HNR and CMS without using any vulcanizing agents would be of interest for the preparation of the green biodegradable rubber products in the future. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47271.