^(60)CO-γ辐照接枝魔芋-丙烯酸-尿素及产物结构分析

Preparation and structural performance of copolymer from konjac glucomannan graft acrylic acid and urea by ^(60)CO-γ irradiation

将魔芋葡甘聚糖(KGM)、丙烯酸、尿素同时进行60CO-γ辐照接枝,制备丙烯酸-尿素-魔芋葡甘聚糖聚合物,并利用红外光谱、扫描电镜、透射电镜、差示扫描量热仪和元素分析技术对聚合产物结构和性能进行了分析。结果表明,尿素的最佳反应量为每3g魔芋粉7.5g,此时产物氮质量含量为8%,吸收自来水的倍数达146倍,植物有效水质量含量为99.73%。结构分析说明,KGM与丙烯酸接枝聚合物构成产物基质,形成孔结构,尿素及其衍生物为突起附着在孔结构上,尿素与KGM未发生接枝反应。溶液态产物具有KGM-丙烯酸接枝物的凝胶团结构和尿素及衍生物的网状结构共存的微观形貌。

Grafting acrylic acid(AA) and urea onto crude konjac glucomannana(KGM) by 60CO-γ irradiation to prepare a KGM-AA-urea copolymer and the structural performance was characterized by means of infrared spectroscopy(FTIR),transmission electron microscope(TEM),scanning electron microscopy(SEM) and difierential scanning calorimetry(DSC).The results showed that the optimum reaction mass of urea was 20% and the nitrogen content of product was 8.0%.The product had 146 times absorption of tip water.The free and bounder water content of fully swollen product was 99.73%.Structure analysis showed that the AA grafed with konjac,but urea not.The solid product forms dense network structure and with protuberance on the net surface,which comes from konjac-graft-AA and urea respectively.The product of the solution has two simultaneous microcosmic forms:netted and gelatinous structure.