摘要
[目的]为利用纤维素制备热塑性高分子材料提供依据。[方法]在一定温度下,将预处理后的原料(干燥麦草浆)浸入一定量的乳酸中,搅拌一定时间后干燥至恒重,研究温度、时间对纤维素聚合度和碘吸附值的影响,并分析麦草浆纤维素在乳酸介质中化学结构的变化。[结果]温度高于30℃时,纤维素开始降解,且温度越高,纤维素降解越剧烈。温度和搅拌时间对纤维素聚合度和碘吸附值的影响较大,而乳酸用量对其影响较小。红外谱图和X-衍射图谱分析结果表明,60℃之前,麦草浆在乳酸介质中主要发生物理溶胀和少量的降解;超过70℃后,麦草浆除发生降解外,还可能伴随着化学反应,但纤维素的晶型未发生改变。[结论]该研究为纤维素在乳酸介质中的改性提供了资料。
[Objective] The study was to provide the basis for preparation of thermoplastic polymer material with cellulose.[Method] The pretreated raw materials（dry wheat straw pulp）were immersed into a certain amount of lactic acid at certain temperature.After stirred for some time,they were dried to constant weight.The effects of temperature,time on polymerization degree and iodine adsorption value of cellulose were studied,and the change of chemical structure of wheat straw cellulose in acid medium was analyzed.[Results] When temperature was higher than 30 ℃,the cellulose began to degrade,and the higher the temperature was,the more the cellulose degradation.The effects of temperature and stirring time on polymerization degree and iodine adsorption value of cellulose were bigger,while the effect of lactic acid dosage on them was small.The analysis of infrared spectrum and X-ray diffraction pattern showed that,when temperature was lower than 60 ℃,the physical swelling of wheat straw pulp was the main action in lactic acid medium,and a small amount of wheat straw pulp was degraded.When the temperature was above 70 ℃,the degradation and chemical reaction of wheat straw pulp were all occurred,but the cellulose crystalline of cellulose had no change.[Conclusion] The study provided the information for cellulose modification in acid medium.
出处
《安徽农业科学》
CAS
北大核心
2010年第27期15449-15452,共4页
Journal of Anhui Agricultural Sciences
关键词
麦草浆
R-18值
碘吸附值
聚合度
红外谱图
Wheat straw pulp； R-18 value； Iodine adsorption value； Polymerization degree； Infrared spectrum；
