文献类型：期刊文献

英文题名：Investigation of curing and thermal behavior of benzoxazine and lignin mixtures

作者：Nour-Eddine, El Mansouri[1];Yuan, Qiaolong[1];Huang, Farong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Specially Funct Polymers & Related Techno, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2012

卷号：125

期号：3

起止页码：1773

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20121814974811);WOS:【SCI-EXPANDED(收录号:WOS:000302902200013)】；

基金：The authors thank the Commission for Universities and Research of the DIUiE of the Generalitat of Catalonia and Henkel KGaA for their support.

语种：英文

外文关键词：biopolymers; blends; curing of polymers; thermal properties; thermosets

摘要：This article describes the synthesis and characterization of two types of benzoxazine monomers based on phenol or bisphenol, aniline, and formaldehyde. Their characterization was achieved by Fourier transform infrared, 1H-nuclear magnetic resonance, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Lignin polymer was characterized by infrared, DSC, and TGA. The curing behavior of mixtures of benzoxazine monomers and lignin was investigated by DSC. The mass ratios of benzoxazine monomers/lignin of a series of samples were 100 : 0, 95 : 05, 90 : 10, 85 : 15, 80 : 20, 75 : 25, and 70 : 30. The results indicate that the maximum curing temperatures of the mixtures were lower than that of the pure benzoxazine monomers, and that they decreased with increasing contents of lignin in the mixture. The heat of polymerization (?H) of the benzoxazine monomers and lignin mixtures as a function of the mass ratio and the structure of the benzoxazine monomers shows no definite trend. The samples were cured according to the following conditions: 170 degrees C/2h + 200 degrees C/2h and analyzed by DSC and TGA. In all the samples, the glass transition temperature of the benzoxazines increased upon mixing with increasing amounts of lignin. The changes may be due to the formation of a more compact network structure in the mixtures. The thermal stability of the isothermally cured resins is found to be dependent on the mass ratio of benzoxazine/lignin and structure of the benzoxazine monomers. The more lignin in the mixture, the higher is the char yield in the mixture. (c) 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012