金属离子对纤维素碱性降解影响的初步研究

摘要

With cellobiose,microcrystal cellulose (MCC) and absorbent cotton cellulose as model materials of cellulose,the effect of K+ , Mg2+ , Ca2+ on the cellulose alkaline degradation in different conditions was studied. The results showed that the types,dosages and reaction time of metal ions had a great effect on the alkaline degradation of cellulose. K+ promoted cellulose alkaline degradation while Mg2+ and Ca2+ inhibited the alkaline degradation of cellulose. With the increase of the dosage of metal ions and the prolonging of reaction time , the promotion function of K+ and the inhibition effects of Mg2+ and Ca2+ on the alkaline degradation of cellulose became more significant.%以纤维素二糖、微晶纤维素及脱脂棉作为纤维素模型物,分别考察K+、Mg2+和Ca2+对纤维素碱性降解性能的影响.结果表明:金属离子的种类、用量及反应时间均会影响纤维素的碱性降解.K+对纤维素碱性降解有促进作用,Mg2+和Ca2+则会抑制纤维素碱性降解反应;并且随着金属离子用量的增加及反应时间的延长,K+的促进作用及Mg2+、Ca2+的抑制作用愈加明显.