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首页> 外文期刊>Journal of Applied Polymer Science >Crystalline Structure and Morphology of Poly(L-lactide) Formed Under High Pressure
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Crystalline Structure and Morphology of Poly(L-lactide) Formed Under High Pressure

机译：高压下形成的聚（L-丙交酯）的晶体结构和形态

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摘要

The poly(L-lactide) (PLLA) samples were prepared by the annealing under 100 MPa at 75–145℃ and 200 MPa at 105– 145℃ for 6 h, respectively. The crystalline structures, thermal properties and morphology were investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), and scanning electron microscopy (SEM). On the basis of the DSC and WAXD results, it can be seen that the α' form was formed by the annealing under 100 MPa at 85–95℃ but not found under 200 MPa at 105–145℃. A phase diagram of PLLA crystal form under high pressure was constructed under the given experimental conditions, which displayed the α' form was formed at limited temperature and pressure range. Besides, SEM suggested that the PLLA samples annealed under 100 MPa crystallize to form lamellar-like crystals due to the low growth rate and the confined crystallization behavior under high pressure.
机译：聚（L-丙交酯）（PLLA）样品分别通过在75〜145℃的100 MPa和105〜145℃的200 MPa下分别退火6 h制备而成。使用差示扫描量热法（DSC），广角X射线衍射（WAXD）和扫描电子显微镜（SEM）研究了晶体结构，热性质和形态。根据DSC和WAXD结果，可以看出α'形式是在85-95℃100 MPa下退火形成的，而在105-145℃200 MPa下退火则没有形成。在给定的实验条件下构建了高压下PLLA晶相的相图，显示了在有限的温度和压力范围内形成了α'晶型。 SEM表明，由于低的生长速度和高压下的有限的结晶行为，在100 MPa下退火的PLLA样品结晶形成层状晶体。

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