Liu Y, Tian F, Hu K A
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030, PR China.
Carbohydr Res. 2004 Mar 15;339(4):845-51. doi: 10.1016/j.carres.2003.09.013.
A brush-like poly(DL)-lactide grafted onto chitosan as the backbone was investigated. The graft copolymerization was carried out with triethylaluminum as catalyst in toluene at 70 degrees C. It was found that a greater lactide content in the feeding ratio results in a higher grafting percentage. FTIR spectrometry, (1)H NMR, DSC scanning, and wide-angle X-ray scattering, respectively, are used to characterize these branch copolymers. A copolymer has a definite melting point when the molar feeding ratio of lactide to chitosan is more than 10:1, and the deltaH of the copolymers increases with the feed ratio of lactide to chitosan in feeding.
研究了以壳聚糖为主链接枝的刷状聚（DL）-丙交酯。在70℃下，以三乙基铝为催化剂，在甲苯中进行接枝共聚反应。发现进料比中丙交酯含量越高，接枝率越高。分别用傅里叶变换红外光谱法、核磁共振氢谱、差示扫描量热法和广角X射线散射法对这些支化共聚物进行表征。当丙交酯与壳聚糖的摩尔进料比大于10:1时，共聚物具有确定的熔点，并且共聚物的焓变随着进料中丙交酯与壳聚糖的进料比增加而增大。
