氧化降解程度对接枝共聚改性淀粉性能的影响

Effect of oxidative degradation degree on the properties of grafted copolymer of starch

以玉米淀粉为原料,(NH4)2S2O8为氧化剂,采用一步氧化法对淀粉氧化降解,进而与乙烯基类单体接枝共聚,制备了乙烯基类单体接枝共聚改性淀粉,并应用于蓝湿革复鞣工艺。结果表明,当(NH4)2S2O8用量为7.5%、降解温度为95℃、降解时间为30min时,共聚物的接枝率、接枝效率和单体转化率较高,且共聚物对坯革具有一定的复鞣填充和捕获游离甲醛的作用。FT-IR、XRD和TGA结果表明乙烯基类单体已成功接枝于氧化降解淀粉分子上。

Grafted copolymer of oxidized starch and vinyl monomers was prepared using corn starch as raw material and （NH4）2S2O8 as oxidant, and it was applied in the retanning of chrome-tanned goatskin leather. The results show that grafted copolymer with higher percentage of graft （G）, higher graft efficiency （GE） and higher monomer conversion （CM） could be obtained when the dosage of oxidant was 7.5%, the temperature of degra- dation was 95℃ and degradation time was 30min. The grafted copolymer had retanning and filling effects, it could capture free-formaldehyde. FT-IR, TGA and XRD show that vinyl monomers had grafted into the molecules of degraded starch successfully.