High-Performance Waterborne Polyurethane Coating Based on a Blocked Isocyanate with Cellulose Nanocrystals (CNC) as the Polyol

2019 ◽  
Vol 2 (2) ◽  
pp. 385-393 ◽  
Author(s):  
Reaz A. Chowdhury ◽  
Caitlyn M. Clarkson ◽  
Shikha Shrestha ◽  
Sami M. El Awad Azrak ◽  
Miran Mavlan ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
High Performance ◽  
Waterborne Polyurethane ◽  
Polyurethane Coating ◽  
Blocked Isocyanate

Role of in situ added cellulose nanocrystals as rheological modulator of novel waterborne polyurethane urea for 3D-printing technology

Cellulose ◽  
2021 ◽  
Author(s):  
Julen Vadillo ◽  
Izaskun Larraza ◽  
Tamara Calvo-Correas ◽  
Nagore Gabilondo ◽  
Christophe Derail ◽  
...  
Keyword(s):  
3D Printing ◽  
Cellulose Nanocrystals ◽  
Waterborne Polyurethane ◽  
Printing Technology ◽  
3D Printing Technology

scholarly journals An Efficient and Sustainable Approach to Prepare Carboxylated Cellulose Nanocrystals for Rubber Reinforcement Featuring Dual Crosslinking Networks

2021 ◽  
Author(s):  
Jie Hu ◽  
Zhengqing Kong ◽  
Ke Liu ◽  
Jinli Qin ◽  
Yuhong Tao ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
High Performance ◽  
Chemical Reactivity ◽  
Epoxy Group ◽  
Crosslinking Agent ◽  
Covalent Bond ◽  
Rubber Matrix ◽  
Styrene Butadiene Rubber ◽  
Carboxyl Groups ◽  
Butadiene Rubber

Abstract The surface functionalization of CNCs and the construction of strong interfacial adhesion between CNCs and rubber matrix are effective way to achieve high performance rubber/CNCs nanocomposites. Herein, carboxylation of sulphated cellulose nanocrystals (CNC-OSO3H) was conducted in aqueous medium by using citric acid as modifier. Large amount of carboxyl groups was successfully grafted on the surface of CNC-OSO3H, which endows the carboxylated CNC-OSO3H (abbreviate as CNC-CA) with higher chemical reactivity and thermal stability. Subsequently, carboxylated styrene butadiene rubber (XSBR)/CNC-CA nanocomposites with dual crosslinking design were prepared by using polyethylene glycol diglycidyl ether (PEGDE) as the crosslinking agent and CNC-CA as the reinforcing fillers. FTIR investigation found that in the obtained nanocomposites, the carboxyl groups on CNC-CA and XSBR formed hydrogen bonds (physical crosslinking) with each other, and the carboxyl groups formed covalent bond with the epoxy group on PEGDE simultaneously. The coexistence of physical and chemical crosslinking improved the interface compatibility between CNC-CA and XSBR matrix, accelerated the homogenous dispersion of CNC-CA and realized the crosslinking of the matrix itself. As expected, XSBR/CNC-CA nanocomposites with dual crosslinking network showed remarkable enhancement in tensile strength (up to 500%), modulus (up to 151%), work of fracture (up to 348%). This work provides both a facile and green approach to obtain carboxylated CNCs and a convenient method for the preparation of high-performance rubber nanocomposites with multiple interactions.

scholarly journals Study of the Effect of PGDA Solvent on Film Formation and Curing Process of Two-Component Waterborne Polyurethane Coatings by FTIR Tracking

Coatings ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 461 ◽  
Author(s):  
Ruitao Wang ◽  
Chunxiang Li ◽  
Zhigang Liu ◽  
Zhongping Yao ◽  
Zhijiang Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Film Formation ◽  
Waterborne Polyurethane ◽  
Hydroxyl Groups ◽  
Curing Process ◽  
Polyurethane Coating ◽  
Polyurethane Coatings ◽  
Rate Of Reaction ◽  
Two Component

Waterborne polyurethane coatings were prepared using polyhydroxyacrylate dispersion, polyisocyanate, and propylene glycol diacetate (PGDA). The rate of reaction between hydroxyl and NCO groups in film formation and curing processes was studied by FTIR. The influence of PGDA amount on film formation and curing was also studied. Results showed that PGDA content had a significant effect on the curing process. With less than 10% PGDA, the role of PGDA was more to assist diffusion of polyhydroxyacrylate and polyisocyanate resin droplets. This promoted the reaction between hydroxyl groups and NCO. With more than 10% PGDA, its effect as a solvent was more and it inhibited the reaction between hydroxyl and NCO groups. When the amount of PGDA was about 10%, the synergy between both the roles promoted the crosslinking and curing reactions. The extent of the curing reaction of NCO was more than 70% in 4 h, which was significantly higher, compared with that of about 30% without PGDA. The good applicability and appearance of the waterborne polyurethane coating prepared in this study were verified for the application to carbon fiber metro vehicles.

scholarly journals High-performance anionic waterborne polyurethane/Ag nanocomposites with excellent antibacterial property via in situ synthesis of Ag nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42296-42304 ◽  
Author(s):  
Zhen Zhong ◽  
Shun Luo ◽  
Kai Yang ◽  
Xiaojian Wu ◽  
Tianbin Ren
Keyword(s):  
Ag Nanoparticles ◽  
High Performance ◽  
Antibacterial Property ◽  
Waterborne Polyurethane ◽  
In Situ Synthesis

High-performance anionic waterborne polyurethane/Ag nanocomposites synthesizedvia in situreduction.

Two different incorporation routes of cellulose nanocrystals in waterborne polyurethane nanocomposites

2016 ◽  
Vol 76 ◽  
pp. 99-109 ◽  
Author(s):  
Arantzazu Santamaria-Echart ◽  
Lorena Ugarte ◽  
Aitor Arbelaiz ◽  
Nagore Gabilondo ◽  
Maria Angeles Corcuera ◽  
...  
Keyword(s):  
Cellulose Nanocrystals ◽  
Waterborne Polyurethane ◽  
Polyurethane Nanocomposites

Mechanical Properties Improvement of Waterborne Polyurethane Coating Films After Rewetting and Drying

2009 ◽  
Vol 27 (4) ◽  
pp. 534-537 ◽  
Author(s):  
Jing He ◽  
Wei Wang ◽  
Caideng Yuan ◽  
Tong-Yi Zhang ◽  
Guohua Chen
Keyword(s):  
Mechanical Properties ◽  
Waterborne Polyurethane ◽  
Polyurethane Coating ◽  
Coating Films
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