Nanocomposites based on renewable thermoplastic polyurethane and chemically modified cellulose nanocrystals with improved mechanical properties

2018 ◽  
Vol 135 (45) ◽  
pp. 46736 ◽  
Author(s):  
Rogerio Prataviera ◽  
Eric Pollet ◽  
Rosario E. S. Bretas ◽  
Luc Avérous ◽  
Alessandra A. Lucas
Keyword(s):  
Mechanical Properties ◽  
Cellulose Nanocrystals ◽  
Thermoplastic Polyurethane ◽  
Chemically Modified ◽  
Modified Cellulose

Morphological, Thermal and Mechanical Properties of Poly(Lactic Acid)/Cellulose/ Nano-Clay Composite

2020 ◽  
Vol 856 ◽  
pp. 331-338
Author(s):  
Sirisart Ouajai ◽  
Suttinun Phongtamrug
Keyword(s):  
Mechanical Properties ◽  
Flexural Modulus ◽  
Poly Lactic Acid ◽  
Thermal And Mechanical Properties ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Chemically Modified ◽  
Nano Clay ◽  
Twin Screw ◽  
Modified Cellulose

This research has focused on the effect of modified cellulose and clay on the thermal and mechanical properties of PLA bio-nanocomposite. Cellulose was chemically modified with silane coupling agent in order to enhance compatiblization with PLA. Successful modification was confirmed by Fourier Transform Infrared Spectroscopy and EDX-SEM. PLA was compounded with various amounts and ratios of the modified cellulose and clay by a twin-screw extruder. Thermal properties of the bio-nanocomposites were characterized by Thermogravimetric Analysis and Differential Scanning Calorimetry. Glass transition temperature of the bio-nanocomposite slightly decreased whereas melting temperature remained constant when the amount of both fillers was increased. In addition, crystallization behaviour of PLA has been influenced by the type and amount of the fillers. Clay showed a greater effect on the crystallization of PLA than the modified cellulose and unmodified one, respectively. The flexural modulus of the composite containing equal amount between clay and cellulose was increased with an increasing in fillers contents. But the flexural and impact strength of composite were gradually decreased with an increase in fillers contents. Variation of clay and cellulose ratio resulted in the change of mechanical properties. The composite containing higher ratio between clay:cellulose or cellulose:clay showed a better mechnical properties comparing to the ratio of clay:cellulose equal to 1:1.

scholarly journals Mechanical and Optical Properties of Polylactic Acid Films Containing Surfactant-Modified Cellulose Nanocrystals

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jose Luis Orellana ◽  
Derek Wichhart ◽  
Christopher L. Kitchens
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Optical Properties ◽  
Polylactic Acid ◽  
Cellulose Nanocrystals ◽  
Cetyltrimethylammonium Bromide ◽  
Polymeric Matrices ◽  
Nanoscale Structure ◽  
Surface Modified ◽  
Modified Cellulose

The addition of surface-modified cellulose nanocrystals (CNCs) to polymeric matrices can lead to an enhancement of the mechanical and optical properties of host polymers. The use of surfactants can provide an easy and effective way to change the CNC functionality and to evaluate the effects of surface chemistry in the reinforcement mechanisms. In this work, CNCs were solution blended with polylactic acid (PLA) and melt extruded into films. The PLA toughness increased from 1.70 MJ/m3to 2.74 MJ/m3, a 61% increase, with the addition of 1% of decylamine-modified CNCs without a decrease of the tensile strength or modulus. In this work, we investigated the use of two surfactants, decylamine and cetyltrimethylammonium bromide, to enhance CNC compatibility with the hydrophobic PLA matrix. Decylamine at 1.0 wt.% with respect to CNC loading was found to significantly enhance CNC compatibility and property enhancement. The low concentration of surfactant is notable, as other works typically use significantly higher loadings for CNC incorporation and property enhancement. At high CNC concentrations, mechanical properties decreased but the aligned assembly of the CNCs provided intricate colors to the films when observed between crossed polars. The alignment and nanoscale structure of CNCs within the films play an important role in the properties obtained.

scholarly journals Chemically modified cellulose nanocrystals as polyanion for preparation of polyelectrolyte complex

Cellulose ◽  
2019 ◽  
Vol 26 (3) ◽  
pp. 1725-1746
Author(s):  
Niédja Fittipaldi Vasconcelos ◽  
Judith Pessoa Andrade Feitosa ◽  
Fábia Karine Andrade ◽  
Marcus Aurélio Ribeiro Miranda ◽  
José Marcos Sasaki ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Polyelectrolyte Complex ◽  
Chemically Modified ◽  
Modified Cellulose

scholarly journals Surface Modification of Cellulose Nanocrystals with Lactone Monomers via Plasma-Induced Polymerization and Their Application in ABS Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2699
Author(s):  
Ramón Díaz de León ◽  
Ediberto Guzmán ◽  
Ricardo López González ◽  
Alejandro Díaz Elizondo ◽  
Ilse Magaña ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Surface Modification ◽  
Yield Stress ◽  
Cellulose Nanocrystals ◽  
Polymeric Materials ◽  
Environmental Problems ◽  
Plasma Power ◽  
Polymeric Matrices ◽  
Promising Application ◽  
Modified Cellulose

The growing concern for environmental problems has motivated the use of materials obtained from bio-based resources such as cellulose nanocrystals which have a promising application acting as fillers or reinforcements of polymeric materials. In this context, in this article, plasma-induced polymerization is proposed as a strategy to modify nanocrystals at different plasma power intensities using ε-caprolactone and δ-decalactone to improve their compatibility with polymeric matrices. The characterization was carried out using techniques such as FTIR, TGA, XRD, XPS, and AFM, with which a successful functionalization was demonstrated without altering the inherent properties of the nanocrystals. The preparation of ABS nanocomposites was carried out with the modified nanoparticles and the evaluation of the mechanical properties indicates an increase in Young’s modulus and yield stress under certain concentrations of modified cellulose nanocrystals.

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