超声-微波共辐射法合成纤维素-MMA接枝共聚物

引言纤维素作为一种天然的可再生高分子材料,存在于丰富的绿色植物中,是自然界取之不尽用之不竭的清洁资源。因此,在煤、石油、天然气的储量日益减少的今天,纤维素可作为一种可持续发展的绿色资源来研究和开发。而且天然植物纤维资源丰富、价格低廉,并且具有较好的生物可降解性,在

Synthetic MCC-MMA graft copolymer under ultrasound-microwave collaborative irradiation

Grafting of methyl methacrylate(MMA)onto microcrystalline cellulose(MCC)using ceric ammonium nitrate(CAN)as a redox initiator was carried out under ultrasound and microwave synergistic irradiation.The effects of varying monomer concentration，initiator，and reaction time of graft polymerization were studied by determining the grafting parameters，such as grafting percentage.The optimized reaction conditions which resulted in maximum graft ratio of 93% were monomer concentration of 3 ml·（g MCC）-1，initiator concentration of 0.25 mmol·（g MCC）-1 and exposure time of 9 min.The graft copolymers were characterized by Fourier transform infrared spectroscopy(FTIR)，X-ray diffraction(XRD)，thermo gravimetric analysis(TGA)，and differential scanning calorimeters(DSC)，which elucidated the structure changes in comparison with MCC.The crystallinity of the graft copolymers decreased in comparison with that of MCC，and TGA and DSC revealed that copolymer had more thermal stability.