scholarly journals One-Pot Processing of Regenerated Cellulose Nanoparticles/Waterborne Polyurethane Nanocomposite for Eco-friendly Polyurethane Matrix

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 356 ◽  
Author(s):  
Soon Choi ◽  
Min Lee ◽  
Eun Shin
Keyword(s):  
Waterborne Polyurethane ◽  
Mechanical Analysis ◽  
Urea Solution ◽  
Infrared Analysis ◽  
Regenerated Cellulose ◽  
One Pot ◽  
Cellulose Nanoparticles ◽  
Waterborne Polyurethanes ◽  
Stability Of A Solution ◽  
Novel Interactions

Regenerated cellulose nanoparticles (RCNs) reinforced waterborne polyurethanes (WPU) were developed to improve mechanical properties as well as biodegradability by using a facile, eco-friendly approach, and introducing much stronger chemical bonding than common physical bonding between RCNs and WPU. Firstly, RCNs which have an effect on improving the solubility and stability of a solution, thereby resulting in lower crystallinity, were fabricated by using a NaOH/urea solution. In addition, the stronger chemical bond between RCNs and WPU was here introduced by regarding at which stage in particular added RCNs worked best on strengthening their bond in the process of WPU synthesis. The chemical structure, mechanical, particle size and distribution, viscosity, and thermal properties of the resultant RCNs/WPU nanocomposites were investigated by Fourier transform infrared analysis (FTIR), Zeta-potential analysis, viscometer, thermogravimetric analysis (TGA), Instron, and dynamic mechanical analysis (DMA). The results of all characterizations indicated that the RCNs/WPU-DMF associated with the addition of RCNs in DMF-dispersed step resulted in more effectively crosslinked between WPU and nano-fillers of nanocellulose particles in the dispersion than Acetone and Water-dispersed steps, thereby attributing to novel interactions formed between RCNs and WPU.

A healable waterborne polyurethane synergistically cross-linked by hydrogen bonds and covalent bonds for composite conductors

2020 ◽  
Vol 8 (15) ◽  
pp. 5280-5292 ◽  
Author(s):  
Yan Yang ◽  
Zushan Ye ◽  
Xiaoxuan Liu ◽  
Jiahui Su
Keyword(s):  
Hydrogen Bonds ◽  
Waterborne Polyurethane ◽  
Double Bonds ◽  
Covalent Bonds ◽  
Waterborne Polyurethanes ◽  
Composite Conductors

Healable waterborne polyurethanes synergistically cross-linked by dynamic hydrogen bonds and photo-curable double bonds for composite conductors.

scholarly journals Synthetic scheme to improve the solid content of biodegradable waterborne polyurethane by changing the association relationships of hydrophilic fragments

RSC Advances ◽  
2020 ◽  
Vol 10 (48) ◽  
pp. 28680-28694 ◽  
Author(s):  
Zhihui Yang ◽  
Guangfeng Wu
Keyword(s):  
Ethylene Glycol ◽  
Waterborne Polyurethane ◽  
Solid Content ◽  
Synthetic Method ◽  
High Solid Content ◽  
Poly Ethylene Glycol ◽  
High Solid ◽  
Molecular Weights ◽  
Waterborne Polyurethanes ◽  
Poly Ethylene

A synthetic method was developed to prepare biodegradable waterborne polyurethanes (BHPUs) with a high solid content by introducing different molecular weights of poly(ethylene glycol) (PEG) into poly(ε-caprolactone) (PCL)-based polyurethanes.

Regenerated cellulose aerogel: Morphology control and the application as the template for functional cellulose nanoparticles

2020 ◽  
Vol 137 (38) ◽  
pp. 49127
Author(s):  
Yue Tang ◽  
Han‐Qing Wang ◽  
De‐Fa Hou ◽  
Huang Tan ◽  
Ming‐Bo Yang
Keyword(s):  
Morphology Control ◽  
Regenerated Cellulose ◽  
Cellulose Nanoparticles ◽  
Cellulose Aerogel

Thermal and Mechanical Properties of Cyclized Polybutadiene Dielectrics

1986 ◽  
Vol 76 ◽  
Author(s):  
C. W. Wilkins ◽  
H. E. Bair ◽  
M. G. Chan ◽  
R. S. Hutton
Keyword(s):  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Physical And Mechanical Properties ◽  
Mechanical Analysis ◽  
Infrared Analysis ◽  
Thermal And Mechanical Properties ◽  
Scanning Calorimetry ◽  
The Difference ◽  
Thermal Mechanical Analysis ◽  
Lower Glass Transition Temperature

ABSTRACTWe have studied some of the physical and mechanical properties of cyclized polybutadiene (CBR) dielectrics by dynamic mechanical analysis, thermal mechanical analysis, thermogravimetry, infrared analysis, and differential scanning calorimetry. Of interest is the difference in properties between thin (<30 μm) films which have been cured under vacuum and those which have been cured in air. Our results indicate that curing under vacuum prevents oxidation and reduces crosslinking. Vacuum cured films have 20% smaller moduli and 200 lower glass transition temperature than do films produced in air.

Influence of the 2,2-Dimethylol Propionic Acid Content on the Structure-Properties of Waterborne Polyurethane

2012 ◽  
Vol 476-478 ◽  
pp. 2116-2121 ◽  
Author(s):  
Zheng Xiang Wang ◽  
Jian Long Wang ◽  
Li Zheng Gu
Keyword(s):  
Propionic Acid ◽  
Waterborne Polyurethane ◽  
Peel Strength ◽  
Scanning Calorimetry ◽  
Elongation At Break ◽  
Waterborne Polyurethanes ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Lower Elongation ◽  
Dimethylol Propionic Acid ◽  
Structure Properties

Abstract. Series waterborne polyurethane (WPU) dispersions with different 2,2-dimethylol propionic acid (DMPA) content were synthesized by the prepolymer method. Different configurations in the waterborne polyurethanes were obtained by varying the DMPA content. The structure-properties of the WPU dispersions were characterized by Fourier transformed infrared spectroscopy, Thermogravimetric analysis, differential scanning calorimetry, Zetasizer nano etc. The results indicated that the amount of urethane and urea groups (hard segment) increased in the structure of WPU chains with the increasing content of DMPA. In the meantime, the degree of micro-phase separation increased. On the other hand, as the content of DMPA increased, the particle size, the thermal stability and T-peel strength decreased. Moreover, the increased content of DMPA resulted in higher tensile strength and hardness, but lower elongation at break.

Preparation and Application of Undecylenate Based Diol for Bio-Based Waterborne Polyurethane Dispersion

2014 ◽  
Vol 955-959 ◽  
pp. 88-91 ◽  
Author(s):  
Zhe Yang ◽  
Yan Bin Zhu ◽  
Fang Peng ◽  
Chang Qing Fu
Keyword(s):  
Castor Oil ◽  
Room Temperature ◽  
Click Reaction ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Proton Nuclear Magnetic Resonance ◽  
Isophorone Diisocyanate ◽  
Polyurethane Dispersion ◽  
Waterborne Polyurethanes ◽  
Ft Ir

The undecylenate based diol (UAD) has been synthesized from undecylenate by esterification and thiol-ene click reaction sequently, and then it was used as a diol to prepare bio-based waterborne polyurethane (WPU) reacting with isophorone diisocyanate (IPDI) and castor oil-based carboxyl hydrophilic chain extender. The structure of undecylenate based diol was verified by hydrogen proton nuclear magnetic resonance (1H NMR). Fourier transform infrared spectroscopy (FT-IR) was used to characterize the structure of WPU film. Furthermore, particle size and viscosity were used to character apparent properties of the bio-based waterborne polyurethane dispersion. The result shows that: bio-based waterborne polyurethane dispersion is transparent and very stable under room temperature. This work provides a simple and efficient method for the preparation of fatty acids based polyols and bio-based waterborne polyurethanes.

Synthesis and characterization of biodegradable lysine-based waterborne polyurethane for soft tissue engineering applications

2016 ◽  
Vol 4 (11) ◽  
pp. 1682-1690 ◽  
Author(s):  
Hongye Hao ◽  
Jingyu Shao ◽  
Ya Deng ◽  
Shan He ◽  
Feng Luo ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Wound Healing ◽  
Soft Tissue ◽  
Tissue Repair ◽  
Waterborne Polyurethane ◽  
Synthesis And Characterization ◽  
Soft Tissue Repair ◽  
Waterborne Polyurethanes ◽  
Soft Tissue Engineering

Light-crosslinking waterborne polyurethanes (LWPUs) based on lysine possess appropriate elasticity for soft tissue repair, and can induce macrophages into a wound healing phenotype.

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