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Syntheses and Characterizations of Bis(trialkoxysilyl)oligoimides, 1 Synthesis of Model Compounds and Study of the Thermal Self‐Crosslinking
Author(s) -
Bes Laurence,
Rousseau Alain,
Boutevin Bernard,
Mercier Régis,
Sillion Bernard
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010301)202:6<933::aid-macp933>3.0.co;2-w
Subject(s) - hydrosilylation , double bond , allylic rearrangement , thermogravimetric analysis , silane , polymer chemistry , siloxane , chemistry , polymer , organic chemistry , catalysis
The syntheses of cyclohexenic‐, nadic‐ and allylic‐terminated imides are described in the first part of this study. The addition of trialkoxysilyl groups is performed on the oligoimide double bonds via hydrosilylation with a trialkoxysilylsilane or via radical addition of a mercaptopropyltrialkoxysilane. The results show that the cyclohexenic double bond neither reacts with the silane nor with the mercaptan. In contrast, nadic and allylic double bonds undergo hydrosilylation and radical additions. In both cases, quantitative yields are obtained with allylic double bonds. In the second part of this paper, the thermal self‐crosslinking of the oligoimides is reported. Solid‐state 29 Si NMR and FTIR spectroscopic data are used to characterize the bisimide siloxane polymers. Thermogravimetric analyses of the crosslinked materials show that the polymer matrix based on pyromellitic bis[3‐(trialkoxysilyl)propyl]imides are stable up to 440°C.