Mechanical properties of crosslinked polyurethane elastomers based on well-defined prepolymers

2007 ◽  
Vol 107 (3) ◽  
pp. 1439-1448 ◽  
Author(s):  
Piotr Król ◽  
Barbara Pilch-Pitera
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Elastomers

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 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.

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.

Dynamic mechanical properties for polyurethane elastomers applied in elastomeric mortar

2012 ◽  
Vol 126 (4) ◽  
pp. 1461-1467 ◽  
Author(s):  
José Atílio Fritz Fidel Rocco ◽  
José Eduardo Salgueiro Lima ◽  
Vera Lúcia Lourenço ◽  
Natássia Lona Batista ◽  
Edson Cocchieri Botelho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Polyurethane Elastomers ◽  
Dynamic Mechanical

scholarly journals New Hybrid Polyurea-Polyurethane Elastomers with Antistatic Properties and an Influence of Various Additives on Their Physicochemical Properties

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5778
Author(s):  
Szymon Kosiński ◽  
Marcin Gonsior ◽  
Piotr Krzyżanowski ◽  
Iwona Rykowska
Keyword(s):  
Mechanical Properties ◽  
Surface Defects ◽  
Reference Sample ◽  
High Strength ◽  
Hybrid Coatings ◽  
Polyurethane Elastomers ◽  
Existing Structures ◽  
Ft Ir ◽  
Further Development ◽  
Weathering Effects

Polyurea is a synthetic high-strength elastomeric material that can be sprayed as a coating over existing structures in order to protect against weathering effects. It is ideal for anti-corrosion protection and is characterized by excellent mechanical properties and adhesion to various surfaces. Further development of this technology may allow obtaining new coatings with improved antistatic properties, which would be an excellent alternative compared to used antistatic epoxy paints. This paper will examine the influence of tetraalkylammonium salt (1), potassium hexafluorophosphate solution (2) and imidazolium-based ionic liquid (3) on the improvement of antistatic properties of the polyurea-polyurethane coatings. In addition, the modified samples were also verified in terms of changes in mechanical properties and the appearance of functional groups other than in the reference sample, as well as surface defects that may arise due to incompatibility of the antistatic additive with the polymer matrix. In order to obtain information about the properties mentioned above, the electrical resistance was determined, the tensile strength and elongation were measured, FT-IR spectra were made, and images were taken with the use of scanning electron microscopy. The conducted research showed that the antistatic properties of the tested hybrid coatings could be improved, but their use may be associated with certain limitations that should be taken into account when designing such materials.

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