polyurethane low temperature storage modulus
DMA curves of TPU/TPS/POE with various TPS content, (a) storage modulus…
The storage modulus decreased signi - cantly when the temperature ranged from À20 C to 100 C. The penetration degree of POE at the interface of TPU and TPS increased with increasing temperature.
Read MoreDual and triple shape memory properties of poly(ε-caprolactone) …
The DMA curves of storage modulus, loss modulus, and loss factor of all composite test specimens with temperature are shown in Fig. 3 f, g, and h. There is a negative correlation between storage modulus and loss modulus and temperature; that is, when the test temperature continues to increase, the storage modulus and loss …
Read MorePrediction of polyurethane behaviour via time-temperature superposition: Meanings and limitations …
The samples are referred in text as PU-DEG, PU-TMP, PU-DEG-1.8 TMP, PU-DEG-2.6 TMP and PU-DEG-3.4 TMP, where the number refers to the amount of triol used. Flexible polyurethane films were obtained by casting the solutions onto cleaned glass plate, soaking in cold water and drying at 40 °C in a vacuum oven.
Read MoreShape memory polyimide composites with high storage modulus and high glass transition temperature …
The storage modulus of the obtained SMPICs was as high as 26 GPa. The glass transition temperature and thermal decomposition temperature of SMPICs were up to 213°C and 505°C, respectively. Moreover, the shape fixation rate and recovery rate of SMPICs were both more than 94%.
Read MoreStorage modulus and tanδ profiles of the PU sample …
The FPPU elastomer showed notch-insensitivity, remarkable self-healable efficiency (98%), low dynamic dissociation temperature (60 C), excellent reprocessability, and low surface energy (62...
Read MoreTemperature and strain rate dependent tensile behavior of a transparent polyurethane interlayer …
DMA results for storage modulus, loss modulus and loss tangent at a frequency of 1 Hz, 10 Hz, 50 Hz over a temperature range of −150 C to 100 C are plotted in Fig. 3. In addition to temperature effect, the dynamical mechanical property of the polyurethane interlayer is frequency dependent.
Read MoreA Review of Research on the Effect of Temperature on the Properties of Polyurethane …
2.1.1. Influence on Cell Structure Mold temperature affects the cell structure of polyurethane foams, and for the microstructure of polyurethane foams cast at different mold temperatures, Mohan et al. [] carried out a microscopic experiment for observation, and the results showed that polyurethane foams treated at low …
Read MoreUltrahigh energy-dissipation elastomers by precisely tailoring the …
Using prototypical poly (n-butyl acrylate) elastomers, we demonstrate that the polymer-fluid-gels exhibit a controllable ultrahigh energy-dissipation property (loss …
Read MorePolyurethane''s Temperature Range | Gallagher
The DMA test dynamically strains a sample of polyurethane to measure both its storage modulus and loss modulus. When polyurethane is strained, some of the energy is …
Read MoreEnhanced and Reusable Poly(hydroxy urethane)-Based Low Temperature …
Poly(hydroxy urethane)s (PHUs) based on 5-membered cyclic carbonates have emerged as sustainable alternatives to conventional isocyanate-based polyurethanes. However, while from the point of view of sustainability they represent an improvement, their properties are still not competitive with conventional polyurethanes. In this work, the …
Read MoreStudy on polyurethane elastomer modification for improving low-temperature resistance of high-capacity polyurethane …
The low-temperature resistance of HPEBs was investigated by employing an electro-hydraulic servo dynamic compression shear testing ... E*, E′, E″ and tan δ are the compound modulus, storage modulus, loss modulus and loss factor of …
Read MoreHigh thermal storage polyurethane composite embedded with …
Form-stable composite phase change materials exhibit considerable application prospects in the insulation of submarine oil and gas pipelines due to their good chemical stabilities, levels of thermal insulation, and leakage resistances. In this study, composite phase change materials (PU-MPCM) were prepared for application in …
Read MoreElectrostrictive properties of thermoplastic polyurethane elastomer…
Fig. 5 shows the storage modulus response (ΔG′ = G′ − G′ 0) and the storage modulus sensitivity (ΔG′/G′ 0) of the TPE-PU under various electric field strengths (0.1–2 kV/mm). At a low electric field strength, E 95A has the lowest Δ G ′, while E 80A and LPR show higher responses.
Read MoreEffect of Solvent and Functionality on the Physical Properties of Hydroxyl-Terminated Polybutadiene (HTPB)-Based Polyurethane
Storage modulus values for all the four PUs at −100 C are in the range of 2.4–1.4 GPa and decrease with increase in temperature. At −60 C, the storage modulus values for all the four PUs are in the range of 0.045–0.025 GPa, …
Read MorePolyurethane cmp pads having a high modulus ratio
BRIEF SUMMARY OF THE INVENTION. [0005] A chemical-mechanical polishing pad comprising a polyurethane polishing layer having a high storage modulus at low temperatures and a low storage modulus at high temperatures is disclosed. For example a ratio of storage modulus at 25 degrees C to storage modulus at 80 degrees C may …
Read MoreStudy on the Cross-Scale Effects of Microscopic Interactions and Mechanical Properties of Rigid Polyurethane Foam Driven by Negative-Temperature ...
In order to investigate the cross-scale effects of the interaction between the hard and soft segments of stiff polyurethane foam on the material''s mesoscopic pore structure and macroscopic compression characteristics in various negative-temperature environments, this paper used molecular dynamics to calculate the interaction …
Read MoreMechanically robust waterborne polyurethane with excellent room temperature …
The storage modulus of SMPUs (SMPU-1 ∼ SMPU-6) was higher than 900 MPa at −60 C due to the introduction of HMA and 4-APD. When the temperature grew, the storage modulus of SMPUs decreased, but there was a tendency to increase with the increase of pyridine-Zn 2+ coordination bond content.
Read MoreRelationship between modulus and structure of annealed thermoplastic polyurethane …
Relationship between elastic modulus and structure of an annealed thermoplastic polyurethane (TPU) has been investigated by small-angle X-ray scattering (SAXS), tensile testing, and dynamic mechanical thermal analysis (DMTA). With increasing annealing temperature (Ta) up to 125 °C, volume fraction of hard segment (HS)-rich …
Read MorePOLYURETHANE CMP PADS HAVING A HIGH MODULUS RATIO
The pad of claim 1, wherein the thermoplastic polyurethane polishing layer has a storage modulus at 25 degrees C of 1000 MPa or more; or the thermoplastic polyurethane polishing layer has a storage modulus at 80 degrees C of 15 MPa or less. the pad has a density in a range from about 1.1. to about 1.2 g/cm3.
Read MoreA solvent-free processed low-temperature tolerant adhesive
Furthermore, the low-temperature rheological measurements (Fig. 4e) showed that SSFP adhesive has a stable storage modulus (G′) and loss modulus (G″) in the temperature range from −120 to 25 ...
Read MoreUltra-stretchable and ultra-low temperature self-healing polyurethane …
The successful development of polyurethane with excellent low-temperature self-healing capability will facilitate it to find wider applications in composite solid propellants and other fields. Here, we report a design strategy that both quadruple hydrogen bonds and aliphatic disulfide bonds are introduced into polyurethane networks …
Read MoreTemperature and shear dependence of rheological behavior for thermoplastic polyurethane …
(a) Storage modulus (G′) and (b) complex viscosity (η*) versus frequency (ω) curves for all prepared samples (180 C). Fig. 2 shows the Han plots and Cole-Cole plots for all prepared samples. As can be seen, the Han plots of all nanocomposites especially the 3CNT sample deviate from that of the TPU sample in the low frequency region.
Read MoreA solvent-free processed low-temperature tolerant adhesive
Here we develop a solvent-free processed low-temperature tolerant adhesive with excellent adhesion strength and organic solvent stability, wide tolerable …
Read MorePolyurethane cmp pads having a high modulus ratio
The invention discloses a chemical mechanical polishing pad comprising a polyurethane polishing layer having a high storage modulus at a low temperature and a low storage modulus at a high temperature. For example, the ratio of the storage modulus at 25 ° C to the storage modulus at 80 ° C may be 30 or more. The polyurethane polishing layer ...
Read MoreCarbon nanotube–polyurethane shape memory nanocomposites with low trigger temperature …
Master curves constructed from dynamic mechanical analysis show that processing at −5 C and addition of 1.6 wt.% oxidized CNTs enhance the storage modulus of PU foams over a wide temperature and ...
Read MoreThermo-mechanical characterization of electrospun …
The randomly oriented specimens exhibited a storage modulus with a significant increase from 180 to 614 MPa for TPU and TPU/MWCNTs mats, respectively, …
Read More3D printable thermoplastic polyurethane blends with thermal energy storage…
Results of DMTA tests on 3D printed samples. (a) Storage modulus, (b) loss modulus and (c) loss tangent. ... Phase changing nanocomposites for low temperature thermal energy storage and release Express Polym. Lett., 11 (9) (2017), pp. 738-752 CrossRef ...
Read MorePolyurethane/polyhedral oligomeric silsesquioxane shape memory nanocomposites with low trigger temperature …
Ester-based polyurethane (PU) was found to have excellent shape memory properties with low trigger temperature. Polyhedral oligomeric silsesquioxanes (POSS) have drawn considerable interest due to their hybrid organic–inorganic structures consisting of a silica cage surrounded by eight organic groups. Incorporation of functional …
Read MoreElectrostrictive properties of thermoplastic polyurethane elastomer: Effects of urethane …
The dielectric constant increases with increasing temperature, and the ester-type polyurethane (LPR) shows the greatest dielectric constant at all …
Read MoreUltra-low-temperature self-healing polyurethane with enhanced …
Ultra-low-temperature self-healing polyurethane is expected to be applied in the fields of protective coatings, electronic equipment, armaments, and …
Read MoreThermo‐mechanical properties of flexible and rigid …
In this article, flexible and rigid polyurethane (PU)/copper (Cu) composites are prepared via a simple and cost-effective solution casting process. The filler dispersion and chemical bonding of …
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