Temperature dependence of crystalline transition of highly-oriented poly (L-lactide)/poly(D-lactide) blend: In-situ synchrotron X-ray scattering study

被引：76
|
作者：
Xiong, Zujiang [1 ]
Liu, Guoming [1 ]
Zhang, Xiuqin [2 ]
Wen, Tao [1 ]
de Vos, Sicco [3 ]
Joziasse, Cornelis [3 ]
Wang, Dujin [1 ]
机构：
[1] Chinese Acad Sci, Inst Chem, CAS Key Lab Engn Plast, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
[2] Beijing Inst Fash Technol, Sch Mat Sci & Engn, Beijing Key Lab Clothing Mat R&D & Assessment, Beijing 100029, Peoples R China
[3] Purac Biochem BV, NL-4206 AC Gorinchem, Netherlands
来源：
POLYMER | 2013年 / 54卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Stereocomplex polylactide; Crystalline transition; Orientation; ENANTIOMERIC POLY(LACTIC ACID)S; MULTIPLE MELTING BEHAVIOR; STEREOCOMPLEX FORMATION; POLY(L-LACTIC ACID); POLY(L-LACTIDE)/POLY(D-LACTIDE) STEREOCOMPLEX; POLY(D-LACTIC ACID); MOLECULAR-WEIGHT; NONISOTHERMAL CRYSTALLIZATION; POLYLACTIDE STEREOCOMPLEX; NUCLEATING-AGENTS;
D O I：
10.1016/j.polymer.2012.11.076
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Formation of stereocomplex crystals (sc-crystals) of poly(L-lactide)/poly(D-lactide) (PLLA/PDLA) blend has been recognized as a unique opportunity to dramatically improve the heat-resistant of poly(lactic acid) (PLA). In this study, we investigated the dynamic formation and transition of sc-crystals in PLLA/PDLA drawn film with a combination of in-situ synchrotron wide-angle X-ray scattering (WAXS), small-angle X-ray scattering (SAXS) and differential scanning calorimetry (DSC). The correlation between sc-crystals content and the competing formation of alpha crystals (stable phase of PLA) in homopolymers during continuous heating and cooling processes was also studied. It was found that at room temperature, the original PLLA/PDLA drawn film consisted of only alpha crystals, however, with temperature increasing, two populations of sc-crystals were formed at different temperatures from the oriented amorphous region and the molten alpha crystals in the highly-oriented sample, respectively. Furthermore, new types of sc-crystals and alpha crystals with the orientation perpendicular to the original sc-crystals were formed during subsequent cooling process. On the basis of the X-ray scattering and DSC data, a schematic model for crystallization and oriented variation concerning sc-crystals and alpha crystals was proposed. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：964 / 971
页数：8
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