Low temperature shape memory characteristics of segmented polyurethane-nanoclay composites

Gupta, Y. N.; Bhave, Tejashree M.; Abbas, S. M.; Sharma, Rishi; Setua, D. K.

doi:10.1007/s10973-016-5248-6

Cited by 12 publications

(7 citation statements)

References 35 publications

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“…The incorporation of low-molecular-weight diols as chain extender is associated with ancillary reactions with diisocyanates to generate hard segments in TPU by physical cross-linking. The role of the chain extender is thus critical for the gelation kinetics by extending the hydrogen-bonding and overall length of segmented zones. , The Desmopan DP 9386 is composed of polytetramethylene glycol, diphenyl methane diisocynate, and 1,4-butanediol (BD) as chain extender, which could not provide enough rigidity by the extended cross-linking using BD, which corroborates the earlier findings . The Texin SUN PU of 7.5 mg/mL concentration, however, showed good gelation behavior in DMF at 90 °C in time as short as 6 h. The supramolecular self-assembly in commercially available PU in solvent could be attributed to the higher degree of coupling between the dicyclohexylmethane diisocyanate with the combination of 1,4-butanediol and 1,6-hexanediol (HD) in the Texin grade.…”

Section: Results and Discussionsupporting

confidence: 79%

Effect of Reinforcement at Length Scale for Polyurethane Cellular Scaffolds by Supramolecular Assemblies

et al. 2018

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This study is aimed to represent the role of carbonaceous nanofillers to reinforce the commercially available polyurethane porous structure. The effect of dimensionality of fillers to anchor the construction of stable three-dimensional (3D) cellular architectures has been highlighted. The cellular frameworks of commercially available thermoplastic polyurethane (TPU) have been fabricated through the thermoreversible supramolecular self-assembly route. It was established that the minimum shrinkage of TPU lattice structures occurred when the solid-state network is strengthened by the topologically engineered 3D hierarchical nanofillers, where the amount of reinforcement was found to play a critical role. It has been established by series of structure-property correlations that reinforcing the cellular structure to endure the capillary stress is equally effective as supercritical drying for producing low-density porous morphologies. The removal of liquid phase from gel is as important as the presence of 3D fillers in the matrix for reinforcing the cellular structures when replacing the solvent phase with air to generate a two-phase solid-gas engineered morphology. The insight into the polyurethane network structure revealed that the dimensionality, amount, and distribution of fillers in the matrix are critical for reinforcing the cellular scaffolds in solid gel without any cross-linking.

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Section: Results and Discussionsupporting

confidence: 79%

Effect of Reinforcement at Length Scale for Polyurethane Cellular Scaffolds by Supramolecular Assemblies

et al. 2018

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“…Therefore, there are three main factors that affect the relative permeability of nanocomposites: the volume fraction of layered clay, the microscopic morphology (length/ width ratio), and permeability of layered clay. The number of filler particles will affect the proportion of particles per unit volume of the composite material and the number of blocking units [16,17]. At the same time, the physical distribution of particles also plays an important role in effectively improving gas barrier properties.…”

Section: Polyurethane Elastomer Layeredmentioning

confidence: 99%

Polyurethane Elastomer Layered Nanocomposite Material for Sports Grounds and the Preparation Method Thereof

Ren

et al. 2022

BioMed Research International

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Polyurethane, as a rubber material, can relieve the load on the ground and provide seismic design for the venue, which is of great significance for sports venues. In order to improve the seismic resistance and abrasion resistance of materials for sports fields and reduce accidents in sports, this article has carried out research on the polyurethane elastomer layered nanocomposites for sports fields and their preparation. Today’s world is a challenging era of science and technology. The fields of biotechnology, information, medicine, energy, environment, and national defense and security are closely related to the development of high tech, and the requirements for materials are becoming increasingly diversified. Polymer nanocomposite coating has the dual characteristics of organic and inorganic components. It not only retains the advantages of a polymer but also endows it with versatility. It meets the current application needs. It is a hot spot in today’s research. Among them, there are two major problems in the composite process of nanomaterials and polymers: dispersion and compatibility. How to improve the dispersion of nanoparticles and enhance the compatibility between nanoparticles and polymers is an urgent problem to be solved. In the method part, this article introduces a small amount of polyurethane and polyurethane elastomers formed after polyurethane modification and introduces layered compounds and nanocomposites and introduces several models involved in nanomaterials in terms of algorithms. In the analysis part, this paper conducts a comprehensive analysis of the hard segment mass fraction, mechanical properties, thermal decomposition behavior, degradation mechanism, and dynamic mechanical properties. With the increase of GO content, the tensile strength increases significantly and the elongation at break becomes smaller and smaller. When the GO content increases from 0% to 2%, the tensile properties of the WPU film increase from 2.6 MPa to 7.9 MPa and the fracture of the elongation decreased from 201.7% to 62.8%. This shows that the increase in GO content will make the composite material harder and brittle. It can be seen from the experimental results that the preparation of the polyurethane elastomer layered nanocomposite material designed in this paper has a good application effect on sports venues.

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“…The shapememory performance of polyurethane in very low temperatures is significant for automobile industrial uses, such as low spin-out resistance, winter tires, and apparel constituents for usage in exceptionally icy environments, such as locations high above sea level [ 22 , 64 , 78 , 79 , 80 , 81 ].…”

Section: Shape Memory Materials Of Rubbersmentioning

confidence: 99%

Shape Memory Materials from Rubbers

Thomas¹,

Jibin

Kaliyathan

et al. 2021

Materials

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Smart materials are much discussed in the current research scenario. The shape memory effect is one of the most fascinating occurrences in smart materials, both in terms of the phenomenon and its applications. Many metal alloys and polymers exhibit the shape memory effect (SME). Shape memory properties of elastomers, such as rubbers, polyurethanes, and other elastomers, are discussed in depth in this paper. The theory, factors impacting, and key uses of SME elastomers are all covered in this article. SME has been observed in a variety of elastomers and composites. Shape fixity and recovery rate are normally analysed through thermomechanical cycle studies to understand the effectiveness of SMEs. Polymer properties such as chain length, and the inclusion of fillers, such as clays, nanoparticles, and second phase polymers, will have a direct influence on the shape memory effect. The article discusses these aspects in a simple and concise manner.

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Low temperature shape memory characteristics of segmented polyurethane-nanoclay composites

Cited by 12 publications

References 35 publications

Effect of Reinforcement at Length Scale for Polyurethane Cellular Scaffolds by Supramolecular Assemblies

Effect of Reinforcement at Length Scale for Polyurethane Cellular Scaffolds by Supramolecular Assemblies

Polyurethane Elastomer Layered Nanocomposite Material for Sports Grounds and the Preparation Method Thereof

Shape Memory Materials from Rubbers

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