Enhanced toughness and strength of poly (d-lactide) by stereocomplexation with 5-arm poly (l-lactide)

被引：6

作者：

Sun, Bin ^{[1
,2
,3
]}

Liu, Yanlong ^{[1
,2
]}

Zhang, Bao ^{[1
]}

Bian, Xinchao ^{[1
,2
]}

Li, Gao ^{[1
]}

Chen, Xuesi ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, Key Lab Polymer Ecomat, Changchun 130022, Peoples R China

[2] Zhejiang Hisun Biomat Co Ltd, Taizhou 318000, Zhejiang, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2016年 / 133卷 / 01期

基金：

中国国家自然科学基金;

关键词：

biodegradable; blends; mechanical properties; structure-property relations; ENANTIOMERIC POLY(LACTIC ACID)S; HIGH-MOLECULAR-WEIGHT; MECHANICAL-PROPERTIES; CRYSTALLIZATION BEHAVIOR; NUCLEATING-AGENT; TERNARY BLENDS; POLYLACTIDE; FILMS; NANOCOMPOSITES; STABILITY;

D O I：

10.1002/app.42857

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The enhancement of mechanical properties were achieved by solution blending of poly(d-lactide) (PDLA) and 5-arm poly(l-lactide) (5-arm PLLA). Differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) results indicated almost complete stereocomplex could be obtained when 5-arm PLLA exceeded 30wt %. Tensile test results showed that the addition of 5-arm PLLA in linear PDLA gave dramatically improvement both on tensile strength and elongation at break, which generally could not be increased simultaneously. Furthermore, this work transformed PDLA from brittle polymer into tough and flexible materials. The mechanism was proposed based on the TEM results: the stereocomplex crystallites formed during solvent evaporation on the blends were small enough (100-200 nm), which played the role of physical crosslinking points and increased the interaction strength between PDLA and 5-arm PLLA molecules, giving the blends high tensile strength and elongation at break. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 132, 42857.

引用

页数：6

共 33 条

[1]

Alexandre C. S., 2014, J APPL POLYM SCI, V10, P40771

[2] Toughenability of polymers [J].