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Preparation of modified starch‐grafted poly(lactic acid) and a study on compatibilizing efficacy of the copolymers in poly(lactic acid)/thermoplastic starch blends
Author(s) -
Wootthikanokkhan J.,
Kasemwananimit P.,
Sombatsompop N.,
Kositchaiyong A.,
Isarankura na Ayutthaya S.,
Kaabbuathong N.
Publication year - 2012
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.36896
Subject(s) - starch , thermoplastic , materials science , copolymer , polylactic acid , melt flow index , maleic anhydride , fourier transform infrared spectroscopy , polymer blend , polymer chemistry , lactic acid , chemical engineering , composite material , polymer , chemistry , organic chemistry , biology , bacteria , engineering , genetics
This study has concerned preparation of polylactic acid grafted with maleated thermoplastic starch (PLA‐ g ‐MTPS) and a study on compatibilizing efficacy of the above copolymers in PLA/thermoplastic starch (TPS) blends. The PLA‐ g ‐MTPS copolymers were prepared by two‐step reaction. First, maleated thermoplastic starch (MTPS) was prepared by reacting cassava starch with glycerol and maleic anhydride (MA). Second, the MTPS was grafted onto PLA molecules using peroxide as an initiator. Chemical structures of the products were characterized by using Fourier transform infrared spectroscopy and 1 H‐NMR techniques, whereas the acid numbers of the copolymers were determined by titration. Thermal characteristic of the copolymer was also characterized by using dynamic mechanical thermal analysis. In total, 5 wt % of the graft copolymer was blended with PLA and TPS in a twin screw extruder. Mechanical, rheological, and morphological properties of the blends were evaluated via tensile test, melt flow index test, and scanning electron microscopy, respectively. It was found that mechanical properties of the blends depended on starch content and type of the PLA‐ g ‐MTPS. When the PLA‐ g ‐MTPS was prepared at low amount (0.25 pph) of peroxide, the mechanical properties of the blend was improved remarkably as compared to those of the normal blend and/or the blend containing different compatibilizers. Compatibilizing efficacy of the above copolymers became more obvious when the thermoplastic starch (TPS) blending ratio was increased. The above results were ascribed in the light of change in the viscosity and morphology of the blends. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012