中文摘要：

以辛酸亚锡[Sn（Oct）2]作为引发剂，采用ε-己内酯（ε-CL）开环均聚合制备聚ε-己内酯（PCL），考察了n[ε-CL）／n[Sn（Oct）2]、反应温度和反应时间等因素对聚合产物特性黏数的影响。以Sn（Oct）2为催化剂，聚乙二醇（PEG）为引发剂，合成了不同相对分子质量的PCL—PEG—PCL三嵌段共聚物，研究了ε-CL均聚物及共聚物的结构、热性能和结晶形态。PCL最佳合成T-Z为：n[ε-CL）/n[Sn（Oct）2]为400，温度130℃，反应时间4h。随着PEG相对分子质量从2×10^3增加到8×10^3，三嵌段共聚物的熔融温度、熔融焓和结晶温度逐渐升高；结晶温度及PEG相对分子质量对PCL—PEG—PCL三嵌段共聚物球晶的形态和尺寸影响很大。

英文摘要：

Poly（ε-caprolactone） （PCL） was prepared via ring-opening homo-polymerization of ε-caprolactone （ε-CL） with stannous octoate [Sn（Oct）2] as initiator. The effects of molar ratio of the monomer to the initiator, polymerization temperature and time on the intrinsic viscosity of the resultant polymer were examined. A series of PCL-polyethylene glyeol（PEG）-PCL triblock copolymers with different relative molecular mass were synthesized with PEG as initiator and Sn（Oct）2 as catalyst. The structure, thermal properties and crystallization morphology of the PCL and the block copolymers were studied. The optimum synthesis process for the PCL included setting the molar ratio of ε-CL to Sn（Oct）2 at 400 and running the reaction for 4 hour at 130℃. The melting temperature, melting enthalpy and crystallization temperature of the tribloek copolymers increased gradually as the relative molecular mass of PEG rose from 2×10^3 to 8×10^3. The crystallization temperature and the relative molecular mass of PEG had a great impact on the morphology and size of the PCL-PEG-PCL tribloek eopolymers＇ spherulite.