Network Formation of Polycarbosilane Having Acetylglucosamine-Derived Groups

Abstract

Networked polymers were synthesized by crosslinking a polycarbosilane having acetylglucosamine-derived groups (AGA) on the side chains (polyBMSB-AGA) with hexamethylenediisocyanate (HMDI) and their chemical and physical properties were investigated. Two networked polymer films (polyBMSB-AGA-HMDI-1.0 and polyBMSB-AGA-HMDI-0.5) were prepared by adding HMDI to polyBMSB-AGA in molar ratios of [AGA] / [HMDI] = 1.0 and 0.5 respectively, and their N,N-dimethylformamide (DMF) solutions were cast on the Teflon mold followed by heating up to 120℃. Existence of urethane structures in the materials was confirmed by IR spectroscopy. Differential scanning calorimetry analysis (DSC) indicated that the crystallization of AGA groups was inhibited in the crosslinked polymer. Thermal gravimetric analysis (TGA) suggested that the networked polymers were thermally stable below 140℃. In addition, tensile strength analysis showed that the polyBMSB-AGA-HMDI-0.5 film had breaking strength of 155MPa and breaking elongation of 0.16, which indicated that the networked polymer was significantly tough material, compared to the previously reported analogous networked materials (polyBMSB-Glucose-HMDI-0.5) composed of polycarbosilane having glucose-derived groups crosslinked with HMDI.