Modified cellulose nanocrystals enhancement to mechanical properties and water resistance of vegetable oil‐based waterborne polyurethane

2019 ◽  
Vol 136 (47) ◽  
pp. 48228 ◽  
Author(s):  
Pingbo Zhang ◽  
Yadong Lu ◽  
Mingming Fan ◽  
Pingping Jiang ◽  
Yuming Dong
Keyword(s):  
Mechanical Properties ◽  
Vegetable Oil ◽  
Cellulose Nanocrystals ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Modified Cellulose

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.

Synthesis and Properties of Acrylate Modified Waterborne Polyurethane Emulsion

2012 ◽  
Vol 535-537 ◽  
pp. 1386-1392 ◽  
Author(s):  
Liang Fei
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Experimental Results ◽  
Polymerization Temperature ◽  
Core Shell ◽  
Structures And Properties ◽  
Resistance Stability ◽  
Shell Composite

Acrylate modified waterborne polyurethane (PUA) emulsion was prepared by means of core-shell polymerization processes. The structures and properties of emulsions were characterized by FTIR, TEM and DSC. The effects of polymerization temperature, the type and amount of initiator and the acrylic amount on the properties of emulsions were investigated. The experimental results showed that the emulsions prepared were core-shell composite, when the polymerization temperature was 70~75 °C, using oil-soluble initiator azobisisobutyronitrile (AIBN), and the percentage of AIBN was 2.0%~ 2.5%, the properties of the emulsion can be better, and the water resistance, stability and mechanical properties of the PUA films were improved increasingly.

Properties and Application of Waterborne Polyurethane/starch Composite Surface Sizing Agent

2011 ◽  
Vol 317-319 ◽  
pp. 15-18 ◽  
Author(s):  
Yu Hua Guo ◽  
Shu Cai Li ◽  
Gao Sheng Wang
Keyword(s):  
Mechanical Properties ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Polymerization Process ◽  
Composite Surface ◽  
Surface Sizing ◽  
End Capping ◽  
Development Prospects

TDI as main isocyanate, IPDI as end-capping reagent, waterborne polyurethane (WPU) surface-sizing agent have been obtained by a pre–polymerization process. WPU were mixed with starch SSA in different proportion and a composite sizing agent obtained. It is indicated the water resistance, gloss and folding resistance of WPU/starch sized papers are much higher than starch sized papers. The ink absorption obviously decreases and the mechanical properties wholly increase. WPU/starch composite emulsions is a new kind of surface sizing agent having broad development prospects.

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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