Journal
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
Volume 30, Issue 5, Pages 1108-1114Publisher
JOURNAL WUHAN UNIV TECHNOLOGY
DOI: 10.1007/s11595-015-1280-9
Keywords
corn starch; polylactic acid; mixing ratio; interdependence of two-phase; properties
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Funding
- National Forestry Public Welfare Industry Major Projects of Scientific Research [201504502]
- National Natural Science Foundation of China [31200442]
- Ministry of Science and Technology of China [2014M550178]
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Starch/polylactic acid (PLA) composites were prepared by melt extrusion, with corn starch and PLA as raw materials, glycerol as the plasticizer. Effects of starch/PLA ratio on the interdependence of two-phase and other properties of the composites were studied. The combination of results of TGA with SEM indicated that the interdependence between starch and PLA was increased gradually as the starch/PLA ratio reduced. DSC results showed that the glass transition temperature (T-g), melting temperature (T-m) and degree of crystallinity of PLA in composites were increased gradually, whereas the cold crystallization temperature (T-c) was gradually decreased as the starch/PLA ratio reduced. The rheological properties of composites were closely related with the interdependence of two-phase, with reducing starch/PLA proportion, the interdependence was increased, and then the strain for storage modulus was firstl reduced and then gradually increased. Frequency scanning showed that the storage modulus and complex viscosity were decreased with reducing starch content. As the starch/PLA ratio reduced, the matrix phase PLA was increased, so that the strength of composites was increased gradually, whereas water absorption rate was decreased gradually.
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