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Cold Crystallization of Glassy Polylactide during Solvent Crazing
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsami.7b09666 Elena S. Trofimchuk 1 , Alexander V. Efimov 1 , Tatiana E. Grokhovskaya 1 , Nina I. Nikonorova 1 , Marina A. Moskvina 1 , Nikita G. Sedush 2, 3 , Pavel V. Dorovatovskii 2 , Olga A. Ivanova 1 , Ekaterina G. Rukhlya 1 , Aleksandr L. Volynskii 1 , Sergey N. Chvalun 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-20 00:00:00 , DOI: 10.1021/acsami.7b09666 Elena S. Trofimchuk 1 , Alexander V. Efimov 1 , Tatiana E. Grokhovskaya 1 , Nina I. Nikonorova 1 , Marina A. Moskvina 1 , Nikita G. Sedush 2, 3 , Pavel V. Dorovatovskii 2 , Olga A. Ivanova 1 , Ekaterina G. Rukhlya 1 , Aleksandr L. Volynskii 1 , Sergey N. Chvalun 2
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Uniaxial tension accompanied by the orientation and crystallization of polymer chains is one of the powerful methods for the improvement of mechanical properties. Crystallization of amorphous isotropic polylactide (PLA) at room temperature is studied for the first time during the drawing of films in the presence of liquid adsorption-active media (ethanol, water–ethanol mixtures, and n-heptane) by the solvent crazing mechanism. The crystalline structure arises only under simultaneous actions of a liquid medium and a tensile stress and does not depend on the nature of the environment. The degree of polymer crystallinity increases nearly linearly with the growth in the fraction of the fibrillar material and reaches a maximum value of 42–45%. It has been stated that polymer crystallization happens in crazes involving nanofibrils with a diameter of about 10–20 nm without affecting the bulk polymer parts. Wide-angle X-ray scattering has been used to confirm that the crazing-induced crystallization is accompanied by the formation of the α′-crystalline phase with crystallite sizes (X-ray coherent scattering region) of 3–5 nm, depending on the nature of the liquid medium. After stretching in liquid media to a high tensile strain, the strength of a PLA film has increased to 200 MPa.
中文翻译：
溶剂裂纹过程中玻璃状聚丙交酯的冷结晶
伴随着聚合物链的取向和结晶的单轴张力是改善机械性能的有力方法之一。膜的液体吸附活性介质（乙醇，水-乙醇混合物，和存在下的拉伸期间在室温下无定形各向同性聚丙交酯（PLA）的结晶进行了研究，第一次Ñ-庚烷）通过溶剂的龟裂机理。晶体结构仅在液体介质和拉伸应力的同时作用下产生，并且不取决于环境的性质。聚合物结晶度随原纤维材料分数的增加几乎呈线性增加，并达到42-45％的最大值。据指出，聚合物结晶发生在包含约10–20 nm直径的纳米原纤维的疯子中，而不会影响聚合物的整体部分。广角X射线散射已被用于确认裂纹诱导的结晶过程伴随着3'-5 nm的微晶尺寸（X射线相干散射区域）的α'晶相的形成，具体取决于液体介质的性质。在液体介质中拉伸至高拉伸应变后，
更新日期：2017-09-20
中文翻译：
溶剂裂纹过程中玻璃状聚丙交酯的冷结晶
伴随着聚合物链的取向和结晶的单轴张力是改善机械性能的有力方法之一。膜的液体吸附活性介质（乙醇，水-乙醇混合物，和存在下的拉伸期间在室温下无定形各向同性聚丙交酯（PLA）的结晶进行了研究，第一次Ñ-庚烷）通过溶剂的龟裂机理。晶体结构仅在液体介质和拉伸应力的同时作用下产生，并且不取决于环境的性质。聚合物结晶度随原纤维材料分数的增加几乎呈线性增加，并达到42-45％的最大值。据指出，聚合物结晶发生在包含约10–20 nm直径的纳米原纤维的疯子中，而不会影响聚合物的整体部分。广角X射线散射已被用于确认裂纹诱导的结晶过程伴随着3'-5 nm的微晶尺寸（X射线相干散射区域）的α'晶相的形成，具体取决于液体介质的性质。在液体介质中拉伸至高拉伸应变后，
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