Influence of chain extender on thermal properties and melt flow index of stereocomplex PLA

被引：55
作者：
Baimark, Yodthong [1 ]
Srihanam, Prasong
机构：
[1] Mahasarakham Univ, Dept Chem, Biodegradable Polymers Res Unit, Fac Sci, Maha Sarakham 44150, Thailand
来源：
POLYMER TESTING | 2015年 / 45卷
关键词：
Biodegradable polymers; Polylactide; Stereocomplex; Chain extender; Melt flow index; DEGRADATION; BLENDS; ACID);
D O I：
10.1016/j.polymertesting.2015.04.017
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of chain extension and melt blending temperature on the stereocomplex formation of 50/50 (w/w) poly(L-lactide) (PLLA)/poly(D-lactide) (PDLA) blends or stereocomplex polylactides (scPLAs) were investigated. Joncryl (R) ADR 4368, a styrene-acrylic multifunctional oligomeric agent, was used as a chain extender. Differential scanning calorimetry and X-ray diffractometry were used to confirm the stereocomplex formation of the PLLA/PDLA blends. Melt flow indices (MFI) of the blends were also determined. The stereocomplex crystallinities gradually decreased with increasing blending temperature and Joncryl (R) ADR 4368 ratio. The significant decrease in the MFI of scPLAs is believed to be attributed to chain extension at the blending temperatures of 170 degrees C and 200 degrees C. The MFI values of scPLAs decreased as the Joncryl (R) ADR 4368 ratio and blending temperature increased. The results indicated that the chain extension has an effect on the stereocomplexation and it improved the melt strength of the scPLAs. (C) 2015 Published by Elsevier Ltd.
引用
收藏
页码：52 / 57
页数：6
相关论文
共 16 条
[1]   Melt preparation and nucleation efficiency of polylactide stereocomplex crystallites [J].
Anderson, KS ;
Hillmyer, MA .
POLYMER, 2006, 47 (06) :2030-2035
[2]   Influence of chain extender on mechanical, thermal and morphological properties of blown films of PLA/PBAT blends [J].
Arruda, Liliane Cardoso ;
Magaton, Marina ;
Suman Bretas, Rosario Elida ;
Ueki, Marcelo Massayoshi .
POLYMER TESTING, 2015, 43 :27-37
[3]   Sheets of branched poly(lactic acid) obtained by one step reactive extrusion calendering process: Melt rheology analysis [J].
Cailloux, J. ;
Santana, O. O. ;
Franco-Urquiza, E. ;
Bou, J. J. ;
Carrasco, F. ;
Gamez-Perez, J. ;
Maspoch, M. L. .
EXPRESS POLYMER LETTERS, 2013, 7 (03) :304-318
[4]   Crystal and Thermal Properties of PLLA/PDLA Blends Synthesized by Direct Melt Polycondensation [J].
Chen, Dakai ;
Li, Jing ;
Ren, Jie .
JOURNAL OF POLYMERS AND THE ENVIRONMENT, 2011, 19 (03) :574-581
[5]   Enhanced stereocomplex formation of poly(L-lactic acid) and poly(D-lactic acid) in the presence of stereoblock poly(lactic acid) [J].
Fukushima, Kazuki ;
Chang, Yoon-Hee ;
Kimura, Yoshiharu .
MACROMOLECULAR BIOSCIENCE, 2007, 7 (06) :829-835
[6]   Unique crystallization behavior of poly(L-lactide)/poly(D-lactide) stereocomplex depending on initial melt states [J].
He, Yong ;
Xu, Ying ;
Wei, Jia ;
Fan, Zhongyong ;
Li, Suming .
POLYMER, 2008, 49 (26) :5670-5675
[7]   Synthesis, characterization, and stereocomplex-induced gelation of block copolymers prepared by ring-opening polymerization of L(D)-lactide in the presence of poly(ethylene glycol) [J].
Li, SM ;
Vert, M .
MACROMOLECULES, 2003, 36 (21) :8008-8014
[8]   Improved mechanical and thermal properties of PLLA by solvent blending with PDLA-b-PEG-b-PDLA [J].
Liu, Yanlong ;
Shao, Jun ;
Sun, Jingru ;
Bian, Xinchao ;
Feng, Lidong ;
Xiang, Sheng ;
Sun, Bin ;
Chen, Zhiming ;
Li, Gao ;
Chen, Xuesi .
POLYMER DEGRADATION AND STABILITY, 2014, 101 :10-17
[9]   Control of thermal degradation of polylactide (PLA)-clay nanocomposites using chain extenders [J].
Najafi, N. ;
Heuzey, M. C. ;
Carreau, P. J. ;
Wood-Adams, Paula M. .
POLYMER DEGRADATION AND STABILITY, 2012, 97 (04) :554-565
[10]   Preparation and properties of multi-branched poly(D-lactide) derived from polyglycidol and its stereocomplex blends [J].
Petchsuk, A. ;
Buchatip, S. ;
Supmak, W. ;
Opaprakasit, M. ;
Opaprakasit, P. .
EXPRESS POLYMER LETTERS, 2014, 8 (10) :779-789
12