Compatibility study of pectin and polylactic acid (PLA) blends using molecular dynamics and characterization of thermally pressed blend film
2018
Zhongqi Sun | Yun Deng | Huai Sun | Yanyun Zhao | Haiyan Gao | Hangjun Chen | Honglei Mu
Pectin was used to modify poly (lactic acid) (PLA) to develop an amphiphilic packaging material. Molecular dynamics was employed to assess the compatibility of pectin and PLA. The structure and the hydrophilicity of the pectin-PLA blend films, prepared using graded hot-pressing, were characterized. The results showed that pectin and PLA were not compatible in molecular dynamic simulation, and the thermodynamic test of pectin-PLA blend films also indicated the incompatibility which showed two glass transition temperatures (62.2 deg C and 157.3 deg C, respectively). Moreover, the thermal stability of the blend films increased with increasing pectin content in the films, and the films maintained good hydrophilic property with the contact angle less than 90deg C. This study could inspire further macroscopic and microscopic evaluation of blend films.
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