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首页> 外文期刊>Journal of Applied Polymer Science >Time-of-flight Secondary Ion Mass Spectrometry Investigation of Epoxy Resin Curing Behavior in Real Time
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Time-of-flight Secondary Ion Mass Spectrometry Investigation of Epoxy Resin Curing Behavior in Real Time

机译：飞行时间二次离子质谱实时研究环氧树脂固化行为

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摘要

Time-of-flight secondary ion mass spectrometry and principal components analysis were used in real time to monitor the progress Of Curing reactions on the surface of a diglycidyl ether of bisphenol A (DGEBA) and diglycidyl ether of bisphenol F (DGEBF) epoxy resin blend reacted with the diamine hardener isophorone diamine at different time intervals. Molecular ions in the mass spectra that characterized the curing reactions steps, including blocking, coupling, branching, and crosslinking, were identified. The aliphatic hydrocarbon ions were correlated to the Curing reaction rate, and this indicated that Coupling and branching occurred much faster than the blocking and crosslinking curing reactions steps. The total conversion of the coupling and branching reaction steps were followed on the basis of changes with time in the relative ion intensity of molecular ions assigned to the DGEBA/DGEBF, aliphatic hydrocarbon, epoxide, and aromatic ring structures. Indicative measures of crosslinking density were monitored through the observation of changes in the ratio of the relative intensities of the aliphatic hydrocarbon and hydroxyl molecular ions over time. The Curing reaction conversion was established by the observation of the changes in the relative ion intensity of the molecular ions that were related to the DGEBA/DGEBF molecules.
机译：实时使用飞行时间二次离子质谱法和主成分分析来监控双酚A（DGEBA）的双缩水甘油醚和双酚F（DGEBF）环氧树脂共混物的表面固化反应的进程在不同的时间间隔与二胺硬化剂异佛尔酮二胺反应。在质谱图中鉴定了表征固化反应步骤的分子离子，包括封闭，偶联，支化和交联。脂族烃离子与固化反应速率相关，这表明偶联和支化的发生比封闭和交联固化反应步骤快得多。基于分配给DGEBA / DGEBF，脂族烃，环氧化物和芳族环结构的分子离子的相对离子强度随时间的变化，跟踪偶联和支化反应步骤的总转化率。通过观察脂族烃和羟基分子离子的相对强度之比随时间的变化来监测交联密度的指示性措施。通过观察与DGEBA / DGEBF分子有关的分子离子的相对离子强度的变化来建立固化反应转化率。

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