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首页> 外文期刊>Journal of Applied Polymer Science >Analysis by mass spectrometry of the hydrolysis/condensation reaction of a trialkoxysilane in various dental monomer solutions
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Analysis by mass spectrometry of the hydrolysis/condensation reaction of a trialkoxysilane in various dental monomer solutions

机译：通过质谱分析三烷氧基硅烷在各种牙科单体溶液中的水解/缩合反应

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摘要

3-Methacryloxypropyltrimethoxysilane (MPTMS) was converted to silsesquioxane oligomers by hydrolysis/condensation in three dental monomer solutions. The molecular mass distribution and molecular structures of these oligomers was studied by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Each dental monomer imparted distinct characteristics on the oligomeric silsesquioxane produced. Ethoxylated bisphenol A dimethacrylate (EBPADMA) produced low-mass oligomer silsesquioxanes that showed complete hydrolysis and a very high degree of intramolecular condensation (i.e., there were no methoxy and few silanol groups remaining on the oligomers). 1,6-Bis(methacryloxy-2-ethoxycarbon-ylamino) 2,4,4-trimethylhexane also produced fully hydrolyzed oligomeric silsesquioxanes but with twice the average molecular mass as the EBPADMA. Finally, triethylene glycol dimethacrylate produced higher mass oligomeric silsesquioxanes than EBPADMA even though it showed incomplete hydrolysis. The degree of hydrolysis increased with increasing mass, as did the degree of intramolecular condensation. Oligomers with degrees of polymerization below 8 were poorly hydrolyzed and showed little if any intramolecular condensation. Those with degrees of polymerization of 9 or greater were almost completely hydrolyzed with a high level of intramolecular condensation. (c) 2005 Wiley Periodicals, Inc.
机译：通过在三种牙科单体溶液中水解/缩合，将3-甲基丙烯酰氧基丙基三甲氧基硅烷（MPTMS）转化为倍半硅氧烷低聚物。通过基质辅助激光解吸/电离飞行时间质谱研究了这些低聚物的分子质量分布和分子结构。每种牙科单体在产生的低聚倍半硅氧烷上均具有独特的特性。乙氧基化双酚A二甲基丙烯酸酯（EBPADMA）产生低质量的低聚物倍半硅氧烷，显示出完全水解和非常高的分子内缩合度（即，在低聚物上没有甲氧基和很少的硅烷醇基团残留）。 1,6-双（甲基丙烯酰氧基-2-乙氧基碳-基氨基）2,4,4-三甲基己烷也产生了完全水解的低聚倍半硅氧烷，但其平均分子量是EBPADMA的两倍。最后，三乙二醇二甲基丙烯酸酯产生的低聚倍半硅氧烷质量比EBPADMA高，尽管它显示出不完全的水解。水解度随质量的增加而增加，分子内缩合度也随之增加。聚合度低于8的低聚物水解不良，几乎没有分子内缩合。聚合度为9或更高的那些几乎被高水平的分子内缩合完全水解。 （c）2005年Wiley Periodicals，Inc.

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