A new thermo set system based on cardanol benzoxazine and hydroxy benzoxazoline with lower cure temperature

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• 作者：B.S. Rao ; ^{butti@iict.res.in} ; ^{bsrao1485@rediffmail.com} ; Aruna Palanisamy
• 关键词：Cardanol ; Poly benzoxazine ; Benzoxazoline ; Curing of monomers ; Viscoelastic properties
• 刊名：Progress in Organic Coatings
• 出版年：2012
• 期刊代码：70_03009440
• 类别：ce
• 出版时间：July, 2012
• 卷：74
• 期：3
• 页码：427-434
• 文件大小：846 K

摘要

This paper describes the synthesis and characterization of a new curing system consisting of mono functional benzoxazine based on cardanol and hydroxyl functionalized benzoxazoline, where the phenol hydroxyl group acts both as a catalyst for the ring opening reaction of benzoxazine as well as oxazoline ring. The curing initiation temperature of cardanol benzoxazine was reduced to 138 掳C from 230 掳C with incorporation of hydroxy benzoxazoline (HBO). The heat of polymerization value has increased with incorporation of hydroxyl benzoxazoline up to 50 mol.%. The activation energy of cardanol benzoxazine has reduced initially with incorporation of hydroxyl benzoxazoline and later increased with respect to composition of monomers in the mixture. The flexible cardanol benzoxazine polymer displayed a lower storage modulus of 2.7 脳 10⁸ [pa] and a tan 未 of 104 掳C. The copolymers exhibited significant enhancement in these values with incorporation of hydroxyl benzoxazoline. The width of tan 未 peak of copolymers also increased suggesting enhancement of toughness.