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Open AccessReview

Thermoplastic Processing of PLA/Cellulose Nanomaterials Composites

1
Department of Chemistry, Nelson Mandela University, Port Elizabeth 6031, South Africa
2
CSIR Materials Science and Manufacturing, Polymers and Composites, Port Elizabeth 6000, South Africa
3
School of Natural and Applied Sciences, Sol Plaatje University, Kimberley 8301, South Africa
4
Institute for NanoEngineering Research (INER), Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Pretoria 0001, South Africa
5
Department of Life Sciences, Central University of Technology Free State, Private Bag X20539, Bloemfontein 9301, South Africa
*
Authors to whom correspondence should be addressed.
Polymers 2018, 10(12), 1363; https://doi.org/10.3390/polym10121363
Received: 20 October 2018 / Revised: 28 November 2018 / Accepted: 7 December 2018 / Published: 9 December 2018
(This article belongs to the Special Issue Recent Advances in Bioplastics)
Over the past decades, research has escalated on the use of polylactic acid (PLA) as a replacement for petroleum-based polymers. This is due to its valuable properties, such as renewability, biodegradability, biocompatibility and good thermomechanical properties. Despite possessing good mechanical properties comparable to conventional petroleum-based polymers, PLA suffers from some shortcomings such as low thermal resistance, heat distortion temperature and rate of crystallization, thus different fillers have been used to overcome these limitations. In the framework of environmentally friendly processes and products, there has been growing interest on the use of cellulose nanomaterials viz. cellulose nanocrystals (CNC) and nanofibers (CNF) as natural fillers for PLA towards advanced applications other than short-term packaging and biomedical. Cellulosic nanomaterials are renewable in nature, biodegradable, eco-friendly and they possess high strength and stiffness. In the case of eco-friendly processes, various conventional processing techniques, such as melt extrusion, melt-spinning, and compression molding, have been used to produce PLA composites. This review addresses the critical factors in the manufacturing of PLA-cellulosic nanomaterials by using conventional techniques and recent advances needed to promote and improve the dispersion of the cellulosic nanomaterials. Different aspects, including morphology, mechanical behavior and thermal properties, as well as comparisons of CNC- and CNF-reinforced PLA, are also discussed. View Full-Text
Keywords: polylactic acid (PLA); cellulose nanomaterials; composites; functionalization; properties polylactic acid (PLA); cellulose nanomaterials; composites; functionalization; properties
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MDPI and ACS Style

Mokhena, T.C.; Sefadi, J.S.; Sadiku, E.R.; John, M.J.; Mochane, M.J.; Mtibe, A. Thermoplastic Processing of PLA/Cellulose Nanomaterials Composites. Polymers 2018, 10, 1363.

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