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首页> 外文期刊>Journal of mass spectrometry: JMS >Halohydrination of epoxy resins using sodium halides as cationizing agents in MALDI-MS and DIOS-MS
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Halohydrination of epoxy resins using sodium halides as cationizing agents in MALDI-MS and DIOS-MS

机译：使用卤化钠作为MALDI-MS和DIOS-MS的阳离子的环氧树脂的卤水

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摘要

Halohydrination of epoxy resins using sodium halides as cationizing agents in matrix-assisted laser desorption/ionization (MALDI) and desorption ionization on porous silicon mass spectrometry (DIOS-MS) were investigated. Different mass spectra were observed when NaClO4 and NaI were used as the cationizing agents at the highest concentration of 10.0 mM, which is much higher than that normally used in MALDI-MS. MALDI mass spectra of epoxy resins using NaI revealed iodohydrination to occur as epoxy functions of the polymers. The halohydrination also occurred using NaBr, but not NaCl, due to the differences in their nucleophilicities. On the basis of the results of experiments using deuterated CD3OD as the solvent, the hydrogen atom source was probably ambient water or residual solvent, rather than being derived from matrices. Halohydrination also occurred with DIOS-MS in which no organic matrix was used; in addition, reduction of epoxy functions was observed with DIOS. NaI is a useful cationizing agent for changing the chemical form of epoxy resins due to iodohydrination and, thus, for identifying the presence of epoxy functions.
机译：研究了使用卤化钠作为基质辅助激光解吸/电离（MALDI）中的阳离子化剂的环氧树脂的卤水水合，并进行多孔硅质谱（DIOS-MS）的解吸电离。当NaClO4和Nai用作最高浓度为10.0mm的阳离子化剂时，观察到不同的质谱，这远远高于通常用于MALDI-MS的阳离子。使用Nai的环氧树脂的MALDI质谱显示为聚合物的环氧官能化。由于其亲核的差异，也使用NaBr而不是NaCl发生卤水。在使用氘代CD3od作为溶剂的实验结果的基础上，氢原子源可能是环境水或残余溶剂，而不是衍生自基质。卤水也发生，其中DIOS-MS，其中没有使用有机基质;此外，用DIOS观察到还原环氧功能。 NaI是一种有用的阳离子化剂，用于改变由于碘水合的碘环氧树脂的化学形式，因此用于鉴定环氧官能的存在。

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