scholarly journals Facile synthesis of chitosan/Ag-waterborne polyurethane composite films with a high stability and controllable water resistance for potential application in antibacterial materials

2021 ◽  
Author(s):  
Youliang Cheng ◽  
Ying Wei ◽  
Changqing Fang ◽  
Hang Li ◽  
Jing Chen ◽  
...  
Keyword(s):  
Potential Application ◽  
High Stability ◽  
Water Resistance ◽  
Composite Films ◽  
Waterborne Polyurethane ◽  
Facile Synthesis ◽  
Antibacterial Materials ◽  
Polyurethane Composite

scholarly journals Few-layer graphene aqueous suspensions for polyurethane composite coatings

MRS Advances ◽  
2016 ◽  
Vol 2 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Eunice Cunha ◽  
Fernando Duarte ◽  
M. Fernanda Proença ◽  
M. Conceição Paiva
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Composite Coatings ◽  
Composite Films ◽  
Water Vapor Permeability ◽  
Waterborne Polyurethane ◽  
Vapor Permeability ◽  
Layer Graphene ◽  
Polyurethane Composite ◽  
Few Layer Graphene

ABSTRACTGraphite nanoplates (GnP) have recently attracted attention as an economically viable alternative for the development of functional and structural nanocomposites. The incorporation of GnP into waterborne polyurethane (WPU) with loadings from 0.1 to 10 wt.% was studied. The mechanical properties of the composite films were assessed by tensile testing showing an increase of the Young’s modulus up to 48%. The electrical conductivity increased by 9 orders of magnitude and the water vapor permeability of the composite films decreased 57% for composites containing 5.0 wt.% of GnP.

Effect of Hydrogen Bonding Interaction on the Properties of Caprolactam-Modified Casein/Waterborne Polyurenthane Composite

2010 ◽  
Vol 160-162 ◽  
pp. 1090-1094 ◽  
Author(s):  
Jian Zhong Ma ◽  
Qun Na Xu ◽  
Dang Ge Gao ◽  
Jing Yi Zhang ◽  
Yan Xiao Ma
Keyword(s):  
Hydrogen Bonding ◽  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Alkali Resistance ◽  
Hydrogen Bonding Interaction ◽  
Polyurethane Composite ◽  
Bonding Interaction ◽  
Ft Ir ◽  
Average Size ◽  
Electrolyte Resistance

Caprolactam modified casein(CA-CPL) was prepared by using casein and caprolactam firstly. Caprolactam modified casein/waterborne polyurethane composite (CA-CPL/WPU) was prepared from CA-CPL and WPU. Effect of compounding conditions, such as the WPU dosage, compounding temperature and compounding time on CA-CPL/WPU performance were investigated. The results indicated that: CA-CPL/WPU achieved superior comprehensive performance when the WPU dosage was 50%, the compounding temperature and the compounding time was 80°Cand 2 h respectively. Viscosity of CA-CPL/WPU decreased firstly with the increasing amount of WPU When the WPU dosage was lower than 30%, and then increased gradually when the WPU dosage was higher than 30%. The more the dosage of WPU used in the reaction, the less dilution stability CA-CPL/WPU had. Acidic resistance, alkali resistance and electrolyte resistance of CA-CPL/WPU seemed to be invariable after WPU was introduced , but water resistance and softness of the film were improved. FT-IR and DLS results indicated that via the compounding process, certain hydrogen bonding interaction in CA-CPL/WPU took place and the obtained CA-CPL/WPU had a small Z-average size and polydispersity.

A covalently cross-linked reduced functionalized graphene oxide/polyurethane composite based on Diels–Alder chemistry and its potential application in healable flexible electronics

2017 ◽  
Vol 5 (1) ◽  
pp. 220-228 ◽  
Author(s):  
Jinhui Li ◽  
Guoping Zhang ◽  
Rong Sun ◽  
Ching-Ping Wong
Keyword(s):  
Graphene Oxide ◽  
Flexible Electronics ◽  
Potential Application ◽  
High Efficiency ◽  
Diels Alder ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Polyurethane Composite

A novel composite of reduced functionalized graphene oxide/polyurethane based on Diels–Alder chemistry was developed which could be healed microwaves with high efficiency and applied in healable flexible electronics.

scholarly journals Facile Synthesis of Sponge-Like Porous Nano Carbon-Coated Silicon Anode with Tunable Pore Structure for High-Stability Lithium-Ion Batteries

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3211
Author(s):  
Shugui Song ◽  
Jingcang Li ◽  
Anqi Zheng ◽  
Yongqiang Yang ◽  
Kuibo Yin
Keyword(s):  
Porous Structure ◽  
Pore Structure ◽  
High Stability ◽  
Cycling Stability ◽  
Silicon Anode ◽  
Slow Heating ◽  
Facile Synthesis ◽  
Silicon Anodes ◽  
Carbon Coated ◽  
Nano Carbon

To address the challenge of the huge volume expansion of silicon anode, carbon-coated silicon has been developed as an effective design strategy due to the improved conductivity and stable electrochemical interface. However, although carbon-coated silicon anodes exhibit improved cycling stability, the complex synthesis methods and uncontrollable structure adjustment still make the carbon-coated silicon anodes hard to popularize in practical application. Herein, we propose a facile method to fabricate sponge-like porous nano carbon-coated silicon (sCCSi) with a tunable pore structure. Through the strategy of adding water into precursor solution combined with a slow heating rate of pre-oxidation, a sponge-like porous structure can be formed. Furthermore, the porous structure can be controlled through stirring temperature and oscillation methods. Owing to the inherent material properties and the sponge-like porous structure, sCCSi shows high conductivity, high specific surface area, and stable chemical bonding. As a result, the sCCSi with normal and excessive silicon-to-carbon ratios all exhibit excellent cycling stability, with 70.6% and 70.2% capacity retentions after 300 cycles at 500 mA g−1, respectively. Furthermore, the enhanced buffering effect on pressure between silicon nanoparticles and carbon material due to the sponge-like porous structure in sCCSi is further revealed through mechanical simulation. Considering the facile synthesis method, flexible regulation of porous structure, and high cycling stability, the design of the sCCSi paves a way for the synthesis of high-stability carbon-coated silicon anodes.

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