壳聚糖/聚乙二醇共混物的相变行为

Phase Change Behavior of Polyethylene Glycol/Chitosan Blends

用TMA（静态热机械分析法）、DSC（差效扫描式量效法）等分析方法研究了壳聚糖和聚乙二醇共混物的相变行为。当共混物中亮聚糖组分含量高于15％、温度高于聚乙二醇熔点时，共混物中的聚乙二醇不融化成液体，仍保持为固体，共混物表现出固态相变行为。TG－DTA（联合热重量-差示热分析法）分析表明该共混物具有较好的效稳定性。

Blends of chitosan with polyethylene glycol(PEG) were prepared from a mixed solution in acetic acid.The phase change behavior of the blends tvas investigated by means of differential scanning calorimetry(DSC) and thermal mechanical analysis (TMA ). It is found that when the chitosan fraction in the blend was higher than 15%, PEG within the blend did not melt into a liguid State as the case with pure PEG. The blends exhibited a solid - solid phase change behavior.The measurement of the combined thermogravimetric - differential thermal analyzer(TG- DTA)indicated that the blend had good thermal stability.