ε-己内酯均聚物及共聚物的合成与表征

Synthesis and characterization of poly(ε-caprolactone) and copolymers ofε-caprolactone with lactide

分别以D,L-乳酸和L-乳酸为原料制得D,L-丙交酯(D,L-LA)和L-丙交酯(L-LA);以辛酸亚锡为内酯开环聚合引发剂,用ε-己内酯(ε-CL)开环均聚合制备聚ε-己内酯,考察了引发剂用量、聚合时间和温度等对聚合产物特性黏数的影响。由ε-CL与D,L-LA和L-LA共聚合制得聚(ε-己内酯-D,L-丙交酯)和聚(ε-己内酯-L-丙交酯),并用傅里叶变换红外光谱、核磁共振氢谱、差示扫描量热法、X射线衍射等对聚合物的结构进行表征;力学性能测试结果表明,聚(ε-己内酯-L-丙交酯)具有很好的弹性和较高的断裂伸长率。

D,L-lactide （D,L-LA） and L-lactide （L-LA） were synthesized with D,L lactic acid and L-lactic acid as raw material respectively. Poly （ε-caprolactone） （PCL） was prepared via ring-opening polymerization of ε-caprolactone （ε-CL） with stannous octoate as initiator. Effects of initiator concentration, polymerization time and temperature on intrinsic viscosity of the resultant polymer were examined. A series of poly（ε- caprolactonε-co-D,L-lactide） and poly（ε-caprolactonε-co-L-lactide） copolymers were prepared through ring-opening copolymerization of ε-caprolactone and D,L-LA or L-LA in the presence of stannous octoate in vacuo. The structure and properties of homopolymers and copolymers were characterized by Fourier transform infrared spectroscopy, hydrogen spectrum of nuclear magnetic resonance, differential scanning calorimetry and X-ray diffractometry. The mechanical analyses indicated that poly（ε-caprolactonε-co-L-lactide）s possessed superior elasticity and comparatively high elongation at break.