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Liu L, Wang F, Zhu Y, Qi H. Preparation and properties of benzoxazine precursors containing siloxane units and their epoxy copolymers. HIGH PERFORM POLYM 2022. [DOI: 10.1177/09540083221128295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Four siloxane benzoxazines containing different rigid segments were successfully synthesized and characterized herein, including a benzene ring, a biphenyl, a naphthalene ring, and a diphenyl sulfone group. Different rigid segments had different effects on polymer properties. The introduction of the naphthalene ring and sulfone group considerably reduced the curing temperature of benzoxazine. Although the benzoxazine with the naphthalene ring exhibited low heat resistance, all the four samples showed a high char yield at 800°C under nitrogen atmosphere. In addition, during copolymerization with AG-80 epoxy, the introduction of epoxy promoted the curing of the benzoxazines containing the naphthalene ring and sulfone group. The heat resistance of all copolymers was considerably improved, especially for the copolymer containing the naphthalene ring, whose 5% thermal weight loss temperature ( Td5) increased from 248°C to 321°C under nitrogen atmosphere. The copolymer containing the biphenyl structure had the highest glass transition temperature, reaching 259.1°C. Copolymerization with epoxy also considerably improved the tensile strength and elongation at break of the copolymers, which were much higher than those of traditional bisphenol A-aniline based benzoxazine (BA-a). Compared with the neat benzoxazine prepared using siloxane and bisphenol A, the developed copolymers also had better tensile properties, and the copolymer containing the sulfone group showed the greatest improvement (from 49 to 69 MPa, from 3.1% to 9.12%).
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Affiliation(s)
- Lele Liu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Fan Wang
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Yaping Zhu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Huimin Qi
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
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Design and synthesis of phenyl silicone rubber with functional epoxy groups through anionic copolymerization and subsequent epoxidation. POLYMER 2020. [DOI: 10.1016/j.polymer.2019.122077] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Su X, Song S, Zhang C, Huang J, Liu Y, Run M, Wu Y. Dynamic mechanical and shape memory properties of polybenzoxazines based on aminopropyl-terminated siloxanes. J Appl Polym Sci 2016. [DOI: 10.1002/app.44121] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Xuehui Su
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Shuning Song
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Chunhui Zhang
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Jinbai Huang
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Yanfang Liu
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Mingtao Run
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
| | - Yonggang Wu
- Key Laboratory of Analytical Science and Technology of Hebei Province College of Chemistry and Environmental Science; Hebei University; Baoding 071002 China
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