Studies on curing and thermal behavior of diglycidyl ether of bisphenol‐A and benzoxazine mixtures
Studies on curing and thermal behavior of diglycidyl ether of bisphenol‐A and benzoxazine mixtures
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DOI：
10.1002/app.26871
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发表时间：
2007-12
影响因子：
3
通讯作者：
Ritu Jain;A. Narula;V. Choudhary
中科院分区：
文献类型：
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作者：
Ritu Jain;A. Narula;V. Choudhary
以苯胺[A]、3-氯苯胺[C]、邻甲苯胺[T]、苯酚[P]、双酚A [B]和甲醛[F]为原料，合成了苯并恶嗪单体。通过使B和F与A、C和T反应制备的苯并恶嗪单体已分别指定为BAF、BCF和BTF。采用FTIR、1H NMR和元素分析对苯并恶嗪进行了结构表征。采用差示扫描量热法研究了苯并恶嗪单体在双酚A二缩水甘油醚（DGEBA）存在下的固化行为。在所有样品中，苯并恶嗪单体：DGEBA的摩尔比为1：0、3：1、1：1和1：3。峰结晶温度（Tp）在苯并恶嗪：DGEBA摩尔比为3：1的所有样品中最低，在摩尔比为1：3的样品中最高。由苯酚、苯胺和甲醛（PAF）制备的苯并恶嗪单体与DGEBA的混合物在固化过程中的聚合热（ΔH）最大。通过在氮气气氛中记录热重曲线来评价等温固化的苯并恶嗪：DGEBA混合物的热稳定性。对于具有比例为3：1的苯并恶嗪：DGEBA的混合物，炭产率最高。© 2007 Wiley Periodicals，Inc.应用聚合物科学杂志2007
This article describes the synthesis and characterization of benzoxazine monomers prepared by reacting the mixture of amine (aniline [A], 3-chloroaniline [C], o-toluidine [T]) and phenol (bisphenol-A [B], phenol [P]) with formaldehyde [F]. The benzoxazine monomers prepared by reacting B and F with A, C, and T have been designated as BAF, BCF, and BTF, respectively. Structural characterization of benzoxazines was done using FTIR, 1H NMR, and elemental analysis. The curing behavior of benzoxazine monomers was investigated by differential scanning calorimetry in the presence of diglycidyl ether of bisphenol-A (DGEBA). In all the samples, the molar ratio of benzoxazine monomer:DGEBA, was varied as 1 :0, 3 : 1, 1 : 1, and 1 :3. The peak exotherm temperature (Tp) was lowest in all the samples having molar ratio of 3 : 1 benzoxazine:DGEBA and highest in samples having molar ratio of 1 : 3. The heat of polymerization (ΔH) was found to be maximum during curing of mixture of DGEBA and benzoxazine monomer prepared from phenol, aniline and formaldehyde (PAF). Thermal stability of benzoxazines:DGEBA mixture cured isothermally was evaluated by recording thermogravimetric traces in nitrogen atmosphere. The char yield was highest for a mixture having benzoxazine : DGEBA in the ratio of 3 : 1. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007