Effect of the composition ratio of copolymerized poly(carbonate) glycol on the microphase-separated structures and mechanical properties of polyurethane elastomers

2004 ◽  
Vol 42 (24) ◽  
pp. 4448-4458 ◽  
Author(s):  
Ken Kojio ◽  
Yoshiteru Nonaka ◽  
Tetsuo Masubuchi ◽  
Mutsuhisa Furukawa
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Elastomers ◽  
Composition Ratio ◽  
Effect Of The Composition ◽  
Poly Carbonate

Cytocompatibility and Material Properties of Poly-carbonate Urethane/Carbon Nanofiber Composites for Neural Applications

2003 ◽  
Vol 774 ◽  
Author(s):  
Janice L. McKenzie ◽  
Michael C. Waid ◽  
Riyi Shi ◽  
Thomas J. Webster
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanofibers ◽  
Material Properties ◽  
Carbon Nanofiber ◽  
Scar Tissue ◽  
Tissue Response ◽  
Positive Interactions ◽  
Weight Percentage ◽  
Poly Carbonate

AbstractCarbon nanofibers possess excellent conductivity properties, which may be beneficial in the design of more effective neural prostheses, however, limited evidence on their cytocompatibility properties exists. The objective of the present in vitro study was to determine cytocompatibility and material properties of formulations containing carbon nanofibers to predict the gliotic scar tissue response. Poly-carbonate urethane was combined with carbon nanofibers in varying weight percentages to provide a supportive matrix with beneficial bulk electrical and mechanical properties. The substrates were tested for mechanical properties and conductivity. Astrocytes (glial scar tissue-forming cells) were seeded onto the substrates for adhesion. Results provided the first evidence that astrocytes preferentially adhered to the composite material that contained the lowest weight percentage of carbon nanofibers. Positive interactions with neurons, and, at the same time, limited astrocyte functions leading to decreased gliotic scar tissue formation are essential for increased neuronal implant efficacy.

An Unparalleled H-bonding and Ion-bonding Crosslinked Waterborne Polyurethane with Super Toughness and Unprecedented Fracture Energy

2021 ◽  
Author(s):  
Yuan Yao ◽  
Bo Liu ◽  
Ziyang Xu ◽  
Jianhai Yang ◽  
Wenguang Liu
Keyword(s):  
Mechanical Properties ◽  
Fracture Energy ◽  
Waterborne Polyurethane ◽  
Self Healing ◽  
Polyurethane Elastomers

Self-healing polyurethane elastomers have been extensively studied; however, developing an eco-friendly self-healable waterborne polyurethane (WPU) with exceptional mechanical properties remains a great challenge. Herein, we report healable, and highly tough...

scholarly journals Intensifications of the wooling mechanism with increasing electric conductivity of fibers

Academia Open ◽  
2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Khasanov Doston
Keyword(s):  
Mechanical Properties ◽  
Electric Conductivity ◽  
Quaternary Salt ◽  
Water Soluble ◽  
Technological Parameters ◽  
Protein Fiber ◽  
Effect Of The Composition

The wide possibilities of modifying manufactured industrial fibers aimed at improving their physico-mechanical properties, structural and technological parameters. In connection with the above, it was of interest to study the effect of a number of water-soluble compositions based on a poly-quaternary salt of dimethyl-allyl-β - methacryloyloxyethylammonium bromide in combination with glycerin on the structural and physico-mechanical properties of protein fiber, and also to study the effect of the composition on wool spinning and the quality of wool yarn .

scholarly journals Study on the Preparation and Application of Lignin-Derived Polycarboxylic Acids

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Ruiqi Wang ◽  
Bing Zhou ◽  
Zichen Wang
Keyword(s):  
Mechanical Properties ◽  
Main Product ◽  
Waterborne Polyurethane ◽  
Reaction Conditions ◽  
Polyurethane Elastomers ◽  
Nmr Spectrum ◽  
H Nmr ◽  
Polycarboxylic Acids ◽  
Benzene Rings ◽  
Ft Ir

Lignin was oxidized by NaOCl, and the main product of the reaction was named lignin-derived polycarboxylic acids (LPCAs). The effect of the reaction conditions was studied. With the mix ratio [n(NaOCl)/m(lignin)] increasing, the content of carboxyl of LPCAs increased. When the reaction temperature or the reaction time increased, the content of carboxyl decreased in different degrees. After the oxidation by NaOCl, the content of hydroxyl and methoxyl of lignin decreased, and the molecular weight of lignin decreased as well. The FT-IR and 1H-NMR spectrum of lignin suggested that the benzene rings of lignin were disrupted after the oxidation. A possible mechanism of the oxidation of lignin by sodium hypochlorite is supposed to briefly demonstrate the reason that the benzene rings were disrupted and the content of carboxyl increased. Finally, an application example shows that LPCAs can strengthen the mechanical properties of waterborne polyurethane elastomers.

Effect of the composition and porosity of sintered titanium nanolaminates on their mechanical properties at high temperatures

2006 ◽  
Vol 38 (6) ◽  
pp. 624-636 ◽  
Author(s):  
S. A. Firstov ◽  
É. P. Pechkovskii ◽  
I. I. Ivanova ◽  
N. P. Brodnikovskii ◽  
V. F. Gorban’ ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperatures ◽  
Sintered Titanium ◽  
Effect Of The Composition

Diisocyanate-Linked Polymers. II. Mechanical and Swelling Properties of Some Polyurethane Elastomers

1960 ◽  
Vol 33 (4) ◽  
pp. 1092-1113
Author(s):  
Thor L. Smith ◽  
Alan B. Magnusson
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Practical Importance ◽  
Linear Polymers ◽  
Dilute Solution ◽  
Polyurethane Elastomers ◽  
Swelling Properties ◽  
Dilute Solution Properties ◽  
One Step ◽  
Cast Technique

Abstract In recent years, as a result of pioneering work in Germany and England, diisocyanate-linked polymers have assumed increasing industrial importance. Special interest is being shown in elastomers and foams, although studies of fibers and plastics are continuing. These several classes of diisocyanate-linked polymers, with their markedly different mechanical properties, are possible because substances having two or more groups containing active hydrogen can potentially be linked by diisocyanates to yield a polymer. Since a great number of such substances exist, data which show relationships between polymer structure and mechanical properties have practical importance as well as theoretical interest. The first paper of this series on diisocyanate-linked polymers discussed the dilute solution properties of linear polymers prepared from toluene-2,4-diisocyanate and polyoxypropylene glycol 2025 (PPG). This paper discusses the properties of one class of diisocyanate-linked elastomers prepared by a one-step cast technique, i.e., all reactants are mixed together initially and then allowed to cure. Although these polyurethane elastomers have relatively poor mechanical properties as compared with certain other types of polyurethane elastomers, they are useful in applications where high tensile strength, tear resistance, and ultimate elongation are not required. They also constitute a class of polyurethane polymers convenient for use in studying relationships between chemical structure and mechanical properties.

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