(2784)ADDITION-CURABLE HYBRID RESIN BASED ON BENZOXAZINE AND POLYSILAZANE

摘要

A novel addition-curable hybrid resin was prepared by thermal prepolymerization reaction between benzoxazine and polysilazane (BZ-PSN). The final product was characterized with Fourier transform infrared spectrometry (FT-IR), proton nuclear magnetic resonance spectroscopy (1H-NMR) and gel permeation chromatography (GPC). Processing capability and cure behavior of BZ-PSN resin was investigated by rotary viscometer and differential scanning calorimetry (DSC), respectively. BZ-PSN resin shows a low viscosity of 180mPa.s at 60°C for above 6 hours, indicating that the resin is suitable for resin transfer molding (RTM) process to fabricate composites. BZ-PSN resin can cure through addition polymerization mechanism, and void-free cured sample can be obtained smoothly without employing any pressure. DSC results show BZ-PSN resin can be cured at about 200 ?C without adding any other curing additives. Dynamic mechanical analysis (DMA) shows the inflection point of tanδ is 353.4 ?C. Thermogravimetric analysis (TGA) showed 5 % weight loss temperature of the final cured products in nitrogen is 437.9 ?C, and char yield is 73.71 % at 900 ?C. Besides, the char yield of cured BZ-PSN resin is 58.5 % after sintering using a muffle furnace at 1000 ?C for 30 minutes in air, revealing that the cured BZ-PSN resin possessed excellent thermo-oxidative stability. The excellent processability and thermal stabilities make BZ-PSN resin a promising candidate for advanced composites matrices.