The bio-elastomer poly (L-lactide--ε-caprolactone) (PLCL) with linear random molecular chain structure exhibits low viscosity and melt strength, resulting in poor foamability, cell merging, or collapse during the foaming process. Consequently, PLCL foams have large cell sizes and low cell densities, limiting their use as biodegradable elastomeric foams. To enhance the foamability of PLCL, poly (D-lactic acid) (PDLA) was incorporated into the PLCL matrix. Stereocomplex crystals (Sc-crystals) formed between the L-LA segments of PLCL and the molecular segments of PDLA. The effects of varying PDLA content on the basic properties and foaming behavior of the blends were investigated. Results indicate that optimal Sc-crystal formation occurs in the PLCL/PDLA-10 blend. The presence of Sc-crystals enhances melt strength and facilitates cell nucleation, reducing cell size from 351.2 to 11.8 μm and increasing cell density from 1.4 × 10 to 1.7 × 10 cells/cm³. Consequently, the mechanical properties of the foam are significantly improved. The Sc-crystal formation between PLCL and PDLA provides an effective method to enhance the processability of linear chain copolymers containing L-lactide.

中文翻译：

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通过引入聚（D-乳酸）形成立体络合物晶体来增强聚（L-丙交酯-co-ε-己内酯）的发泡性


具有线性无规分子链结构的生物弹性体聚(L-丙交酯--ε-己内酯)(PLCL)粘度和熔体强度低，导致发泡过程中发泡性差、泡孔合并或塌陷。因此，PLCL 泡沫具有大的泡孔尺寸和低的泡孔密度，限制了它们作为可生物降解的弹性体泡沫的用途。为了增强 PLCL 的发泡性，将聚（D-乳酸）（PDLA）纳入 PLCL 基质中。 PLCL 的 L-LA 片段和 PDLA 的分子片段之间形成立体络合物晶体（Sc 晶体）。研究了不同 PDLA 含量对共混物基本性能和发泡行为的影响。结果表明，PLCL/PDLA-10 共混物中形成了最佳的 Sc 晶体。 Sc 晶体的存在增强了熔体强度并促进细胞成核，将细胞尺寸从 351.2 减小到 11.8 μm，并将细胞密度从 1.4 × 10 细胞/cm3 增加到 1.7 × 10 细胞/cm3。因此，泡沫的机械性能显着提高。 PLCL和PDLA之间的Sc晶体形成提供了一种有效的方法来提高含有L-丙交酯的直链共聚物的加工性能。