Preparation of bio-based high-strength elastomer through in-situ generated ionic network based on itaconic acid in natural rubber |
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| Authors: | WANG Wei NIU Zhi-bin CHE Wei GENG Jie-ting Hua Jing |
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| Affiliation: | (Qilu Branch Co,SINOPEC,Zibo 255436,China;Key Laboratory of Rubber-plastics of Ministry of Education/Shandong Provincial Key Laboratory of Rubber and Plastics,Qingdao University of Science and Technology,Qingdao 266042,China) |
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| Abstract: | In recent years, reversible networks have shown great potential in the applications of elastomers reinforcing. Itaconic acid(ITA), prepared by the fermentation of subsidiary agricultural products, is eco-friendly and low in cost. ITA has one double bond and two carboxylic acid groups, which can react with unsaturated rubber to prepare carboxylated materials. In this study, zinc oxide(ZnO) was blended with natural rubber, and then ITA was added at 165 ℃ to generate itaconic zinc acid(ZITA) in-situ. The dosage of ITA was 10, 20, 30, 40 phr, respectively, with a mole ratio of ZnO/ITA being of 1.5/1.0. The resulting polymers were named as NR-ZITA X, where X is the amount of ITA. Subsequently, ZITA was grafted onto natural rubber(NR) chains under 160 ℃ with 1 phr dicumyl peroxide as an initiator to prepare NR-ZITA, resulting in an ionic network based on zinc carboxylate groups. As indicated in Fig 1, the characteristic peak of —C=O stretching vibration at 1 692 cm-1 was attributed to —COOH groups in ITA. After reacting with ZnO, the H+ of —COOH groups were replaced by Zn2+. The characteristic peaks of C=O double bonds shifted to 1 526 cm-1 and 1 433 cm-1 due to the conjugation of —COO-. |
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| Keywords: | - |
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