Effect of interfacial modification on the thermo-mechanical properties of flax reinforced polylactide stereocomplex composites

Huihui Zhang; Yuzeng Li; Gesheng Yang; Minmin Yu; Huili Shao

doi:10.1515/polyeng-2020-0010

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Effect of interfacial modification on the thermo-mechanical properties of flax reinforced polylactide stereocomplex composites

Huihui Zhang , Yuzeng Li , Gesheng Yang , Minmin Yu and Huili Shao

Published/Copyright: April 30, 2020

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From the journal Journal of Polymer Engineering Volume 40 Issue 5

Abstract

The flax and equivalent proportion of poly(L-lactic acid)/poly(d-lactic acid) (PLLA/PDLA) were melt compounded and injection molded to prepare flax reinforced polylactide stereocomplex (sc-PLA) bio-composite, and two different coupling agents, hexamethylene diisocyanate (HMDI) and maleic anhydride grafted polypropylene (MAPP), were used to modify the interface of composite, then the influence of different interfacial modification on the structure and properties of composite was investigated. The results showed HMDI modification decreased the total crystallinity of composite but promoted the formation of stereocomplex crystallites (sc), whereas MAPP modification could improve both the total crystallinity and sc crystallinity. HMDI modification significantly improved the interfacial compatibility of composite, and thereby effectively improved the tensile strength and initial storage modulus of composite. By contrast, the interfacial compatibility of flax/sc-PLA composite was weakened by MAPP modification. Although the tensile properties of flax/sc-PLA/MAPP composite decreased, the impact strength of composite was increased by 12.1% than the unmodified composite. Therefore, the tailored flax/sc-PLA composite with varying properties could be prepared by different interfacial modification.

Keywords: composite; flax; interfacial modification; polylactide stereocomplex

Corresponding author: Huihui Zhang, State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai, 201620, China, E-mail: hhzhang@dhu.edu.cn

Funding source: Natural Science Foundation of Shanghai

Award Identifier / Grant number: 16ZR1401600

Funding source: Fundamental Research Funds for the Central Universities

Award Identifier / Grant number: 16D110620

Research funding: This work was supported by the Natural Science Foundation of Shanghai (16ZR1401600); and Fundamental Research Funds for the Central Universities (16D110620).

Acknowledgments

We thank Research Center of Analysis and Measurement, Donghua University and Equipment platform of College of Material Science and Engineering, Donghua University for the analysis and characterization of flax/sc-PLA composites.

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Received: 2020-01-15

Accepted: 2020-03-09

Published Online: 2020-04-30

Published in Print: 2020-05-26

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Articles in the same Issue

https://doi.org/10.1515/polyeng-2020-0010

Keywords for this article

composite; flax; interfacial modification; polylactide stereocomplex