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Rheological, Mechanical, and thermal properties of polylactide/cellulose nanofiber biocomposites
Author(s) -
Safdari Fatemeh,
Bagheriasl Davood,
Carreau Pierre J.,
Heuzey Marie C.,
Kamal Musa R.
Publication year - 2018
Publication title -
polymer composites
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.577
H-Index - 82
eISSN - 1548-0569
pISSN - 0272-8397
DOI - 10.1002/pc.24127
Subject(s) - materials science , composite material , rheology , dynamic mechanical analysis , ultimate tensile strength , nanofiber , cellulose , glass transition , crystallization , scanning electron microscope , composite number , modulus , polymer , chemical engineering , engineering
Biocomposites based on polylactide (PLA) and cellulose nanofibers (CNFs) were prepared via a solution method. The effects of CNFs on rheological, mechanical, thermal, and optical properties of PLA were investigated. Scanning electron microscopy showed that the CNFs were fairly dispersed/distributed in the PLA. Significant increases in the rheological properties of PLA/CNF composites and a remarkable shear‐thinning behavior were observed. Also, apparent yield stress and a transition from liquid‐ to solid‐like behavior indicated a strong 3D network of CNFs. At room temperature, the storage and Young moduli were increased by 50% for the composite containing 5 wt% CNFs as compared to the neat PLA, whereas the tensile strength was increased up to 31%. The Krenchel model was shown to predict well the Young modulus for lower concentrations of CNFs. Moreover, relative to the neat PLA the storage modulus in flexion at 70°C increased by 264% for PLA containing 5 wt% CNFs. Increased crystalline content and a positive shift of the crystallization temperature by incorporating the CNFs in PLA were observed. Also, good light transparency was retained for these PLA/CNF biocomposites. These results show that the preparation method employed in this work leads to PLA/CNF composites with considerably enhanced properties. POLYM. COMPOS., 39:1752–1762, 2018. © 2016 Society of Plastics Engineers