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Effect of starch/polylactic acid ratio on the interdependence of two-phase and the properties of composites

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Abstract

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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Authors and Affiliations

  1. Key Laboratory of Bio-Based Material Science and Technology, Northeast Forestry University, Ministry of Education, Harbin, 150040, China

    Yingfeng Zuo  (左迎峰), Jiyou Gu, Jun Cao, Shuangying Wei, Haiyan Tan & Yanhua Zhang  (张彦华)

  2. College of Material Science & Engineering, Central South University of Forestry & Technology, Changsha, 410004, China

    Yingfeng Zuo  (左迎峰)

Authors
  1. Yingfeng Zuo  (左迎峰)
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  2. Jiyou Gu
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  3. Jun Cao
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  4. Shuangying Wei
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  5. Haiyan Tan
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  6. Yanhua Zhang  (张彦华)
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Corresponding author

Correspondence to Yanhua Zhang  (张彦华).

Additional information

Funded by the National Forestry Public Welfare Industry Major Projects of Scientific Research (No.201504502) and National Natural Science Foundation of China (No. 31200442). Special Thanks Project Supported by the Post Doctorate Research from the Ministry of Science and Technology of China(No.2014M550178)

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Zuo, Y., Gu, J., Cao, J. et al. Effect of starch/polylactic acid ratio on the interdependence of two-phase and the properties of composites. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 30, 1108–1114 (2015). https://doi.org/10.1007/s11595-015-1280-9

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  • DOI: https://doi.org/10.1007/s11595-015-1280-9

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