We synthesized new biodegradable shape-memory polymers (SMPs) by blending synthesized poly(_d,l-lactide-co-ε-caprolactone) (PLCL) and stereocomplex polylactide (sc-PLA) to be used as biomaterials for medical devices. PLCL copolymers (M_n ∼80,000) with various monomer ratios (LA:CL) were synthesized by the bulk ring-opening polymerization. The glass transition temperature of the resulting PLCL copolymers could be well controlled from −3 °C to 60 °C, agreeing well with the values by the Gordon-Taylor equation, confirming the homogeneous random distribution of LA and CL monomers in the synthesized PLCL. The synthesized PLCL and sc-PLA were eventually blended for the fabrication of biodegradable SMPS. The PLCL/sc-PLA blend samples possessed the sc-PLA crystallinity of ∼13%, which effectively worked as crosslinkings, exhibiting shape-memory behavior with various switching temperatures (30.5°C–62 °C) and shape-recovery ratios realized by adjusting the CL ratio of the PLCL copolymers: a lower CL ratio resulted in a higher switching temperature and a higher shape-recovery ratio.

我们通过将合成聚（合成新型可生物降解的形状记忆聚合物（SMP）_d，升-lactide-共-ε -己内酯）（PLCL）和立构复合聚乳酸（SC-PLA）被用作生物材料的医疗装置。PLCL 共聚物 ( M _n通过本体开环聚合合成了具有各种单体比例（LA：CL）的~80,000）。所得 PLCL 共聚物的玻璃化转变温度可以很好地控制在 -3°C 至 60°C，与 Gordon-Taylor 方程的值非常吻合，证实了合成 PLCL 中 LA 和 CL 单体的均匀随机分布。合成的 PLCL 和 sc-PLA 最终混合用于制造可生物降解的 SMPS。PLCL/sc-PLA 共混物样品具有约 13% 的 sc-PLA 结晶度，可有效地起到交联作用，在各种转换温度（30.5°C–62°C）和形状恢复率下表现出形状记忆行为调整 PLCL 共聚物的 CL 比率：较低的 CL 比率导致更高的转换温度和更高的形状恢复率。