以辛酸亚锡为催化剂,十二醇为分子量调节剂,经乙交酯开环聚合合成了高相对分子量的聚乙交酯（PGA）。研究不同催化剂含量、调节剂含量和反应时间对合成反应的影响。通过改变催化剂含量,合成特性黏数达3.848 dL/g的PGA;固定催化剂含量,通过改变调节剂含量,得到特性黏数在2.278 dL/g～3.218 dL/g范围内可调的PGA。用红外光谱,核磁共振,X射线衍射（XRD）,差示扫描量热（DSC）和热重分析（TGA）表征其结构和性能。结果表明,PGA是一种半结晶聚合物,结晶度达48.72%,其熔融温度在222℃～224℃之间,具有良好的热学性能。
Ring-opening polymerization（ROP） of glycolide was studied in the presence of l-dodecanol as molecular weight regulator and tin（П） 2-ethylhexanoate（Sn（Oct）2） as catalyst.The highest molecular weight polyglycolide（PGA） was synthesized with intrinsic viscosity 3.848 dL/g.PGA with controlled intrinsic viscosity ranging from 2.278 dL/g to 3.218 dL/g was obtained by the addition of different contents of l-dodecanol.The structure of PGA was characterized by Fourier transform infrared spectroscopy（FT-IR） and nuclear magnetic resonance（1H-NMR）.The PGA was characterized by X-ray diffraction（XRD）,differential scanning calorimetry（DSC） and thermogravimetric analysis（TGA）.The results show that PGA is a semicrystalline polyester with high crystallinity and good thermal properties.The crystallinity is 48.72% and the melt temperature is between 222 ℃ and 224 ℃.
参考文献
| [1] | 杨飞,杨亚明,刘建红,李晓萌,冯增国.聚乙交酯公斤级生产途径探索[J].北京理工大学学报,2001(04):518-523. |
| [2] | Gautier E;Fuertes P;Cassagnau P;Pascault JP;Fleury E .Synthesis and Rheology of Biodegradable Poly(glycolic acid) Prepared by Melt Ring-Opening Polymerization of Glycolide[J].Journal of Polymer Science, Part A. Polymer Chemistry,2009(5):1440-1449. |
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