scholarly journals Synthesis of Mono (Ethylene Glycol)-Based Polyurethane and Effect of Chain Extender on Its Associated Properties

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3436
Author(s):  
Muhammad Shafiq ◽  
Muhammad Taqi Zahid Butt ◽  
Shahzad Maqsood Khan
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Ethylene Glycol ◽  
Terephthalic Acid ◽  
Chain Extender ◽  
Polyurethane Elastomer ◽  
Polyester Polyol ◽  
Polyurethane Elastomers ◽  
Abrasion Wear ◽  
Aromatic Polyester

This study depicts the investigations of the effect of composition of aromatic polyester polyol produced from terephthalic acid (TPA) and different concentrations of monoethylene glycol (mEG) as a chain extender on the mechanical properties of polyurethane (PU) elastomer. Aromatic polyester polyols are prepared via the poly-esterification of adipic acid, terephthalic acid, catalyst, and mono ethylene glycol; while a polyurethane elastomer is formulated via the pre-polymerization of polyol with pure monomeric Methylene diphenyl diisocyanate (MDI.) Mechanical properties of polyurethane elastomers are examined, such as hardness via shore A hardness, apparent density via ASTM (American Society for Testing and Materials) D1622–08, and abrasion wear resistance via a Deutches Institut fur Normung (DIN) abrasion wear resistance tester. Structural properties are investigated through Fourier-transform infrared spectroscopy (FTIR) analysis. Results reveal that the shore A hardness of the PU elastomer increases with an increasing concentration of mEG from 4g to 12g. Nevertheless, the elastomer’s density depicts a reduction with an increasing extender content. The abrasion wear resistance of polyurethane, however, increases with an increasing concentration of glycol. A structural analysis through FTIR confirms the formation of polyurethane elastomer through the characteristic peaks demonstrated.

Study on Mechanical Properties of Polyurethane Elastomers for Drum Scraper

2011 ◽  
Vol 284-286 ◽  
pp. 2384-2387
Author(s):  
Jin Cui Zhang ◽  
Xi Jun Liu ◽  
Tie Ning Ma
Keyword(s):  
Mechanical Properties ◽  
Chain Extender ◽  
Glycol Ether ◽  
Toluene Diisocyanate ◽  
Chain Extension ◽  
Molar Ratio ◽  
Casting Method ◽  
Polyurethane Elastomers ◽  
Application Requirements

Polyurethane elastomers (PUE) were prepared by casting method using the prepolymer and the chain extender. In here, the prepolymer synthesized by using poly(tetramethylene glycol ether) (PTMG) and toluene diisocyanate (TDI), the chain extender was a mixture of 3,5-dimetylthio toluene diamine (E-300) and triethanolamine. The effects of the NCO concentration in prepolymer, the molar ratio of E-300/triethanolamine, and the chain extension coefficient of NCO/NH2 on the mechanical properties of the prepared PUE were studied. The results showed that the prepared PUE possesses excellent mechanical properties which can meet the drum scraper’s application requirements when the NCO concentration in prepolymer was 5.06% and the molar ratio of composite chain extender was 0.92/0.08.

scholarly journals The Green Approach to the Synthesis of Bio-Based Thermoplastic Polyurethane Elastomers with Partially Bio-Based Hard Blocks

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2334
Author(s):  
Ewa Głowińska ◽  
Paulina Kasprzyk ◽  
Janusz Datta
Keyword(s):  
Mechanical Properties ◽  
Thermoplastic Polyurethane ◽  
Viscoelastic Behavior ◽  
Polymeric Materials ◽  
Building Blocks ◽  
Chain Extender ◽  
Sustainable Chemistry ◽  
Polyurethane Elastomers ◽  
Thermoplastic Polyurethane Elastomers ◽  
Hard Segments

Bio-based polymeric materials and green routes for their preparation are current issues of many research works. In this work, we used the diisocyanate mixture based on partially bio-based diisocyanate origin and typical petrochemical diisocyanate for the preparation of novel bio-based thermoplastic polyurethane elastomers (bio-TPUs). We studied the influence of the diisocyanate mixture composition on the chemical structure, thermal, thermomechanical, and mechanical properties of obtained bio-TPUs. Diisocyanate mixture and bio-based 1,4-butanediol (as a low molecular chain extender) created bio-based hard blocks (HS). The diisocyanate mixture contained up to 75 wt % of partially bio-based diisocyanate. It is worth mentioning that the structure and amount of HS impact the phase separation, processing, thermal or mechanical properties of polyurethanes. The soft blocks (SS) in the bio-TPU’s materials were built from α,ω-oligo(ethylene-butylene adipate) diol. Hereby, bio-TPUs differed in hard segments content (c.a. 30; 34; 40, and 53%). We found that already increase of bio-based diisocyanate content of the bio-TPU impact the changes in their thermal stability which was measured by TGA. Based on DMTA results we observed changes in the viscoelastic behavior of bio-TPUs. The DSC analysis revealed decreasing in glass transition temperature and melting temperature of hard segments. In general, obtained materials were characterized by good mechanical properties. The results confirmed the validity of undertaken research problem related to obtaining bio-TPUs consist of bio-based hard building blocks. The application of partially bio-based diisocyanate mixtures and bio-based chain extender for bio-TPU synthesis leads to sustainable chemistry. Therefore the total level of “green carbons” increases with the increase of bio-based diisocyanate content in the bio-TPU structure. Obtained results constitute promising data for further works related to the preparation of fully bio-based thermoplastic polyurethane elastomers and development in the field of bio-based polymeric materials.

Performance Research of PUE/Modified Nanosilicon Carbide / Carbon Nanofibers

2013 ◽  
Vol 772 ◽  
pp. 376-379
Author(s):  
Qing Zhen Wen ◽  
Qing Cheng ◽  
Jin Hua Zhu
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Composite Materials ◽  
Propylene Glycol ◽  
Carbon Nanofibers ◽  
Polyurethane Elastomers ◽  
Comprehensive Properties ◽  
Dispersion Degree ◽  
Poly Propylene ◽  
Performance Research

The KH-550 was modified by KH-560, and a new surfactant was got, which was used to modify nanosilicon carbide. Series of modified polyurethane elastomers (PUE) were prepared with 2,4-toluene diisosocyanate (TDI), poly (propylene glycol)(PPG-2000), modified nanosilicon carbide, carbon nanofibers and 3,3'-4,4'-dianino-diphenymethane (MOCA). The influence of different amount of filler on the mechanical properties, wear resistance of composite materials was investigated. The dispersion degree of nanofiller in matrix was analysised by SEM. The results showed that the comprehensive properties of composite had been greatly improved.

scholarly journals Fabrication of Enhanced Mechanical Properties and Intrinsic Flame-Retardant Polyurethane Elastomer Containing 4-(Phenylethynyl) Di(Ethylene Glycol) Phthalate

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2388
Author(s):  
Meina Xie ◽  
Daikun Jia ◽  
Jin Hu ◽  
Jiyu He ◽  
Xiangmei Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Ethylene Glycol ◽  
Heat Release ◽  
Flame Retardant ◽  
Thermoplastic Polyurethane ◽  
Polyurethane Elastomer ◽  
Dramatic Decrease ◽  
Acetylene Compound ◽  
Peak Heat Release Rate ◽  
A Chain

In this study, the aromatic acetylene compound 4-(phenylethynyl) di(ethylene glycol) phthalate (PEPE) was used as a chain extender, partially replacing 1,4-butanediol. To synthesize an intrinsic flame-retardant thermoplastic polyurethane elastomer (TPU) with an aromatic acetylene structure, PEPE was synthesized by a two-step polymerization. The flame retardancy, thermal stability, and mechanical properties of TPU were studied. The microstructure of TPU char was investigated by scanning electron microscopy to analyze the flame-retardant mechanism. The tensile strength of TPU containing 1.35 wt% PEPE was 39.2 MPa, which was almost twice as much as neat TPU, showed a dramatic decrease in the peak heat release rate and total heat release, and declined by 46.2% and 24.5%, respectively. After the flame-retardant TPU burned, a cross-linked network foaming char structure was formed. The results showed that PEPE improved the mechanical properties of TPU and conferred good stability that promoted the formation of charcoal and reduced heat release during the combustion of TPU.

Preparation and Mechanical Properties of Polyurethane Elastomer with Two Soft Segments of HTPB/PTMG

2010 ◽  
Vol 150-151 ◽  
pp. 1689-1692 ◽  
Author(s):  
Hai Tao Tao ◽  
Xi Jun Liu ◽  
Tie Ning Ma
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Molecular Weight ◽  
Treatment Time ◽  
Treatment Temperature ◽  
Chain Extender ◽  
Toluene Diisocyanate ◽  
Molar Ratio ◽  
Mass Ratio ◽  
Polyurethane Elastomers

In this paper, a series of polyurethane elastomers (PUE) were prepared employing casting method using toluene diisocyanate (TDI), hydroxy-terminated butadiene-acrylonitrile copolymer(HTBN) and polytetrahydrofuran glycol (PTMG) as the main raw materials, and using 2,4- and 2,6- dimethylthioaromatic diamine (DMTDA) as a chain extender. The effects of the content of NCO in PUE (NCO%), mass ratio of HTBN/PTMG, molecular weight of PTMG, dosage of chain extender and heat treatment on the mechanical properties of PUE were studied. The results showed that the lower molecular weight of PTMG and the higher heat treatment temperature were both favorable for increasing the mechanical properties of PUE. When the mass ratio of HTBN/PTMG was 35:65, NCO% was 6.0%, molar ratio of NCO/NH2 was 1.20 and heat treatment time was 2h at 115 , the mechanical properties of PUE were best.

Novel High Performance Elastomers: New, Recyclable Materials for Oil and Gas From In-Line Inspection to Pipe Coating

2012 ◽  
Author(s):  
Michael Magerstädt ◽  
Holger Schmidt ◽  
Gunther Blitz ◽  
Ralf Dopieralla ◽  
Frank Schellbach
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
High Performance ◽  
Oil And Gas ◽  
Alkaline Media ◽  
Polyurethane Elastomer ◽  
Polyurethane Elastomers ◽  
Acidic And Alkaline Media ◽  
The Right ◽  
Tear Resistance

Starting out from the need for polyurethanes with higher abrasion and tear resistance for pipeline inspection, an entire class of new high performance elastomers were developed. Within a few years materials were synthesized which did not only extend the mechanical properties of polyurethane elastomers, but also led to the development of completely new products. Applications range from intelligent plastic solutions combining elastomers and electronics via highly abrasion resistant pipe coatings to a new process for recycling and reuse of crosslinked polyurethanes. Fundamental to these successful developments is the “building-block” chemistry of polyurethanes. A very high number of permutations of the up to 7 components used in the synthesis of a polyurethane elastomer is possible. By choosing the right combinations and the right reaction conditions, specific material properties can be designed. Materials exhibiting the following material properties, hitherto not found in polyurethanes, were developed: • An operating temperature range from −50 to +135°C. • Chemical resistance to highly acidic and alkaline media, e.g., pure ammonia. • Significantly higher abrasion and tear resistance than standard polyurethanes. • Exactly adjustable visco-elastic damping (rebound resilience). • Adhesion to steel higher than reported with any other polyurethane elastomer. • A novel polyurethane elastomer with more than 90% share of recycled material reaching mechanical properties in the same range as virgin material. This presentation will detail the materials and their properties and give application examples from pipeline cleaning, pipe protection, and pipe coating to mechanical protection devices made from recycled polyurethane elastomer.

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