Effect of blending conditions on mechanical, thermal, and rheological properties of plasticized poly(lactic acid)/maleated thermoplastic starch blends

Journal article

Authors/Editors

Strategic Research Themes

No matching items found.

Publication Details

Author list: Wootthikanokkhan J., Wongta N., Sombatsompop N., Kositchaiyong A., Wong-On J., Isarankura Na Ayutthaya S., Kaabbuathong N.

Publisher: Wiley

Publication year: 2012

Journal: Journal of Applied Polymer Science (0021-8995)

Volume number: 124

Issue number: 2

Start page: 1012

End page: 1019

Number of pages: 8

ISSN: 0021-8995

eISSN: 1097-4628

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84855352439&doi=10.1002%2fapp.35142&partnerID=40&md5=ffc66434bf4cdc4f5c66795bbe0f9f78

Languages: English-Great Britain (EN-GB)

View in Web of Science | View on publisher site | View citing articles in Web of Science

Abstract

This research work has concerned a study on relationship between structure and properties of maleated thermoplastic starch (MTPS)/plasticized poly(lactic acid) (PLA) blend. The aim of this work is to investigate the effects of blending time, temperature, and blend ratio on mechanical, rheological, and thermal properties of the blend. The MTPS was prepared by mixing the cassava starch with glycerol and maleic anhydride (MA). Chemical structure of the modified starch was characterized by using a FTIR technique, whereas the degree of substitution was determined by using a titration technique. After that, the MTPS prepared by 2.5 pph of MA was further used for blending with triacetin-plasticized PLA under various conditions. Mechanical, thermal, and rheological properties of the blends were evaluated by using a tensile test, dynamic mechanical thermal analysis, and melt flow index (MFI) test, respectively. It was found that tensile strength and modulus of the MTPS/PLA blend increased with the starch content, blending temperature, and time, at the expense of their toughness and elongation values. The MFI values also increased with the above factors, suggesting some chain scission of the polymers during blending. SEM images of the various blends, however, revealed that the blend became more homogeneous if the temperature was increased. The above effect was discussed in the light of trans-esterification. Last, it was found that mechanical properties of the PLA/MTPS blend were more superior to those of the normal PLA/TPS blends. ฉ 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012.

Keywords

miscibility