A MALDI mass spectrometry investigation of the compositions of the products of the partial acidolysis of MeSi(OMe)3

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• 作者：A. G. Ivanov (1)
  V. M. Kopylov (2)
  V. V. Kireev (3)
  R. S. Borisov (4)
  T. I. Fedotova (1)
  Yu. V. Bilichenko (3)
  
• 刊名：Polymer Science Series B
• 出版年：2014
• 出版时间：January 2014
• 年：2014
• 卷：56
• 期：1
• 页码：49-54
• 全文大小：584 KB
• 作者单位：A. G. Ivanov (1)
  V. M. Kopylov (2)
  V. V. Kireev (3)
  R. S. Borisov (4)
  T. I. Fedotova (1)
  Yu. V. Bilichenko (3)
  
  1. State Research Institute of Chemistry and Technology of Organoelement Compounds, sh. Entuziastov 38, Moscow, 111123, Russia
  2. OOO Penta-91, Volgogradskii pr. 47, Moscow, 109316, Russia
  3. Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125047, Russia
  4. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia
  
• ISSN：1555-6123

文摘

The molecular-mass compositions of the products of partial acidohydrolytic polycondensation that are formed during the interaction of MeSi(OMe)3 with CH3COOH have been studied via MALDI mass spectrometry. It has been shown that, depending on the molar ratio of MeSi(OMe)3 and CH3COOH (m/n), a wide range of oligomethylmethoxysiloxanes with the average composition [MeSiO n/m (OMe)(3 ?2n/m)] p are formed. The analysis of molecular masses and 29Si NMR spectra of the products has revealed various types of molecular structures, which change from linear, branched, and cyclic to polycyclic clusters with condensed cycles after a change in the degree of polycondensation α = 100 × [2n/3m] from 66.67 to 83.33%. At a degree of polycondensation of α = 86.67% or higher, the polycyclic clusters form a spatially crosslinked structure (gel).