Biopolymer blends from hardwood lignin and bio-polyamides: Compatibility and miscibility

Muthuraj, Rajendran, Hajee, M., Horrocks, Richard ORCID: 0000-0003-1431-058X and Kandola, Baljinder K. ORCID: 0000-0002-3621-3724 (2019) Biopolymer blends from hardwood lignin and bio-polyamides: Compatibility and miscibility. International Journal of Biological Macromolecules, 132. pp. 439-450. ISSN 0141-8130

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The compatability of hardwood lignin (TcA)/bio-polyamide (PA) blends, prepared by melt compounding TcA with three different biobased polyamides, PA 1012, PA 1010 and PA 11 in a twin screw extruder have been studied. FTIR studies indicated the existence of physicochemical interactions between the TcA and polyamide. The melting temperatures of the blends were significantly reduced compared to the respective neat polyamides, which was attributed to the enhanced compatibility between the two components. The compatibility was also attributed to the increased glass transition (Tg) of the polyamide. Thermogravimetric studies, while not indicating any interaction during the processing stage, suggested that there was some during the thermal degradation stage, which assisted formation of carbonaceous residue. The addition of each polyamide to TcA considerably reduced its viscosity and enhanced its processability even at high lignin contents. Morphological analysis showed that heterogeneity for all the blends was quite uniform, although TcA domain sizes were considerably smaller (~ 0.5 μm) in the PA11 matrix compared to those in PA1010 and PA1012, suggesting better compatibility in the TcA/PA11 blends. This observation was consistent with the thermodynamic Gibbs’ free enery values of the respective blends. Overall, the order of blend compatibility was TcA/PA11 > TcA/PA1010 > TcA/PA1012.

Item Type: Article
Uncontrolled Keywords: Lignin, bio-polyamides, compatibility
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 12 Apr 2019 14:01
Last Modified: 03 Sep 2019 10:59
Identification Number: 10.1016/j.ijbiomac.2019.03.142

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