Preparation and Characterization of Degradable Poly (silyl ester) and the Self-crosslinking Reaction of Poly (silyl ester) without Solvent

摘要

The new poly (silyl ester) has been prepared by the polycondensation reaction of 1,5dichloro-1,1,5,5-tetramethyl-3,3-diphenyl-trisiloxane with di-tert-butyl fumarate by the elimination of tert-butyl chloride as a driving force. To investigate the self-crosslinking reaction of the unsaturated poly (silyl ester), poly (1,1,5,5tetramethyl-3,3-diphenyltrisiloxane) was selfcrosslinked in the presence of 2, 2'-azobis (isobutyronitrile) (AIBN) as a radical initiator without solvent. After the self-crosslinking, the unsaturated poly (silyl ester), which was viscous liquids, turned into solid product. The characterization of the poly (silyl ester) and the self-crosslinked product included 1H-NMR spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Comparisons were made between the linear poly(silyl ester) and the self-crosslinked products. It was found that after crosslinking, the important resonance signal for ethenylene (C=C) of the poly (silyl ester) reduced, which show that the crosslinking reaction is carried out. The selfcrosslinked product exist the structures of linear isomer and four-membered ring isomer. The glasstransition temperatures of the self-crosslinked poly (silyl ester) was higher than that of the uncrosslinked poly (silyl ester), and the thermal stability of the self-crosslinked poly (silyl ester) was better than that of uncrosslinked poly(silyl ester).