What is it about?

This investigation demonstrates sulphuric acid hydrolysis (CNC-S), phosphoric acid hydrolysis (CNC-P) and a novel non-hydrolytic high energy bead milling method (CNC-MC) into a polyether-based thermoplastic polyurethane via melt compounding using a twin-screw extruder. The TPU film incorporated with CNC-S obviously shows the sign of CNC degradation where TPU film was changed to brown colour. The tensile strength of TPU reinforced with CNC-S, CNC-P and CNC-MC show 18%, 16% and 14% of improvement at CNC loading of 0 to 1 wt.% upon host polymer.

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Why is it important?

The melt compounding processing approach for incorporating cellulose nanocrystals (CNC) into thermoplastic polyurethane (TPU) has not well been explored. This is primarily due to the poor thermal stability and dispersibility of CNCs. As they are typically obtained from sulphuric acid hydrolysis, they give rise to degradation and discolouration of the extruded nanocomposites.

Perspectives

CNCs isolated via mild acid hydrolysis and mechanical milling methods, can be easily processed via large scale melt-processing techniques for reinforcing thermoplastic polyurethane without affecting their physical appearance and elastic properties

Dr Pratheep K Annamalai
University of Queensland

Read the Original

This page is a summary of: CELLULOSE NANOCRYSTALS WITH ENHANCED THERMAL STABILITY REINFORCED THERMOPLASTIC POLYURETHANE, Malaysian Journal of Analytical Science, June 2017, Penerbit Universiti Kebangsaan Malaysia (UKM Press), DOI: 10.17576/mjas-2017-2103-25.
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