PLLA-PDLA共聚物薄膜的结晶形态

利用旋涂法制备一系列的聚左旋-右旋乳酸共聚物（PLLA-PDLA）薄膜，对其进行等温结晶处理。利用差示扫描量热仪、原子力显微镜、X-射线衍射仪等手段研究了体系的热性能、结晶形态、晶体结构等性能。结果表明，PLLA-PDLA共聚物在128～153 ℃呈现明显结晶峰，利用原子力显微镜得到PLLA-PDLA共聚物样品在不同温度、不同浓度、不同时间、不同溶剂、不同基底条件下的结晶形态，得到不同尺寸的棒状和支化结构晶体，尤其在玻璃基底上形成细的支化结构且互相缠绕，表面的覆盖密度比硅片高的结晶形态。X-射线衍射分析表明在12.01 °、20.88 °和24.18 °处出现明显的结晶衍射峰。

Crystalline Morphology of PLLA-PDLA Copolymers Films

PLLA-PDLA copolymer film was obtained through spin-coating and crystallized at constant temperature. Thermal property, crystalline morphology, and crystalline structure of the film were studied uisng DSC、AFM, and XRD. At 128-153℃, an obvious crystallization peak was observed. AFM was applied to characterize the crystalline morphology of the film from different crystallization temperature, solution concentration, time, solvent, and substrate. Several rod-shaped and branching crystals with different size were observed. Especially, branching and entangled structures were observed on glass substrate, with a higher coverage density than on the silicon substrate. The XRD gave diffraction peaks at 2q values of 12.01°, 20.88°, and 24.18°.