Journal ArticleDOI
Morphology and thermal properties of polyurethane elastomer based on representative structural chain extenders
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TLDR
In this article, 1, 4-butanediol (1,4-BDO), neopentyl glycol (NPG) and bisphenol-a (BPA) were chosen as chain extenders to prepare polyurethane elastomer (PUE) due to their representative structures.About:
This article is published in Thermochimica Acta.The article was published on 2017-07-10. It has received 63 citations till now.read more
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Polyurethane elastomer composites reinforced with waste natural cellulosic fibers from office paper in thermal properties.
TL;DR: The results showed that cellulosic fibers were covalently bonded to polyurethane molecular chains and served as a cross-linking agent making the degree of phase separation decrease, indicating that celluloic fibers had a potential application in damping materials.
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New approach to recycle office waste paper: Reinforcement for polyurethane with nano cellulose crystals extracted from waste paper.
TL;DR: This work provided a new recycling method of waste paper but also provided a thermolstable PUE with lower cost, which made CNC/PUE2 appealing in load bearing and outdoor applications.
Journal ArticleDOI
Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers
TL;DR: In this article, the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s was investigated.
Effect of the Addition of Tall Oil-Based Polyols on the Thermal and Mechanical Properties of Ureaurethane Elastomers
Abstract: As part of this work, the test results for ureaurethane elastomers (PUURs) manufactured with the use of tall oil (TO)-based polyols with a rosin acid content ranging from 2 to 20% are presented. The goal of this study was to verify the thermal and mechanical properties of bio-based PUURs. The physicomechanical properties of PUURs were tested along with the strength (static tensile test) and thermal properties: thermogravimetry (TGA), differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA). A structural analysis of the materials was also carried out via Fourier transform infrared (FTIR) spectroscopy. The replacement of the chain extender with tall oil-based polyols resulted in materials with different properties, different chemical constitutions and different thermal decomposition patterns. PUURs with TO polyols had a higher thermal resistance, and this resistance increased for higher isocyanate numbers (INCO). The thermal decomposition of the tested PUURs with TO polyols increased with the increase in the rosin acid content. The mechanical properties of the PUURs show that changing the chain extender with the TO polyols causes an increase in the storage modulus.
Journal ArticleDOI
Enhancement of the ballistic performance of aramid fabric with polyurethane and shear thickening fluid
Xingwei Wang,Xingwei Wang,Jianbin Zhang,Luyao Bao,Wufang Yang,Feng Zhou,Weimin Liu,Weimin Liu +7 more
TL;DR: In this article, the authors compared the performance of aramid fabrics impregnated with STF, the composite of STF and PU (STF-PU), and PU were compared in terms of the resistance to single yarn pull-out, the flexibility of fabric and the high-velocity impact test, respectively.
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Journal ArticleDOI
Thermal stability and flame retardancy of polyurethanes
TL;DR: The thermal stability and flame retardancy of polyurethanes is reviewed in this article, where a detailed description of TGA, TGA-MS and TGAFTIR methods for studying the decomposition mechanism and kinetics is also provided.
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Critical parameters in designing segmented polyurethanes and their effect on morphology and properties: A comprehensive review
TL;DR: In this paper, a comprehensive discussion is provided of the critical physical, chemical and structural parameters, such as soft and hard segment structures and their molecular weights, polymer composition, solubility parameters, competitive intermolecular interactions and others, which strongly affect the morphology and bulk and surface properties of segmented thermoplastic polyurethanes.
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FTIR investigation of the influence of diisocyanate symmetry on the morphology development in model segmented polyurethanes
TL;DR: In this article, a single diisocyanate molecule with no chain extenders was used to segmented polyurethanes with hard segments, and the results showed selforganization and formation of well ordered hard segments.
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FT-IR and XPS studies of polyurethane-urea-imide coatings
TL;DR: In this article, a series of polyurethane (PU)-urea-imide coatings were synthesized by a systematic three-step reaction process, and the obtained polymers were analyzed with Fourier transform-infrared (FT-IR) and angle resolved X-ray photoelectron spectroscopy (AR-XPS).
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Synthesis and microstructure–mechanical property relationships of segmented polyurethanes based on a PCL–PTHF–PCL block copolymer as soft segment
L. Rueda-Larraz,B. Fernandez d'Arlas,Agnieszka Tercjak,A. Ribes,Iñaki Mondragon,Arantxa Eceiza +5 more
TL;DR: In this paper, the physic-chemical interactions responsible for the unique polyurethane properties have been evaluated by total attenuated Fourier transform infrared spectroscopy (ATR-IR) in the amide I region using a Gaussian deconvolution technique and, on the other hand, atomic force microscopy (AFM) has been employed to determine the phase microstructures.