Characterization of hard-segment crystalline phase of thermoplastic polyurethane in the presence of butane and glycerol monosterate and its impact on mechanical property and microcellular morphology

Hossieny, Nemat; Shaayegan, Vahid; Ameli, Amir; Saniei, M.; Park, Chul

doi:10.1016/j.polymer.2017.02.015

Cited by 68 publications

(39 citation statements)

References 55 publications

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“…These factors lead to rapid cell growth and limit nuclei generation, thus, induces large cells with small cell numbers . At 120°C, the cells begin to combine locally and the walls of several nearby cells disappear, because the viscosity of the polymer matrix is not high enough to hinder the cell coalescence through vitrification . The results reveal that the optimized T f of PBSUI‐3 and PBSUI‐5 is 80°C and achieve sound microcellular morphologies, such as small cell size and cell wall thickness, high cell density (1.6 × 10 10 ), low opening ratio, and high expansion ratio.…”

Section: Resultsmentioning

confidence: 96%

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Zhang

Wang

et al. 2018

Polymers for Advanced Techs

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Poly(butylene succinate) urethane ionomer (PBSUIs) foams with nano‐microcellular morphology were fabricated using supercritical CO2 (sc‐CO2) at different parameters. Effect of urethane ionic group (UIG) content (ranged from 1% to 5%) on the rheology and crystallization of PBSUIs were evaluated by intrinsic, dynamic rheological, X‐ray diffraction, and differential scanning calorimetry measurements. The results show that the complex viscosity of PBSUIs vastly improved, while their intrinsic viscosity and crystallinity decreased. They also evidenced that CO2 promoted the formation of crystallites in the amorphous and increased the Xc of PBSU and PBSUIs foams. Scanning electron microscope was employed to explore the influences of UIG content and foaming parameters on the morphologies of PBSUIs microcellular foams, and it revealed that UIG content was the dominated factor. The cell size and cell densities of PBSUIs microcellular foams were smaller than 5.0 micrometers and higher than 1.5 × 1010 cells/cm3, respectively, even foamed at diverse variations of foam temperature and pressure. Interestingly, PBSUIs with 3% and 5% UIG content achieved microcellular foams in nano‐cells, high‐stretched elliptical shape. The mechanism was ascribed that these PBSUIs with high melt viscosities could retard the CO2 bubbles to merge during the foam process and induce the cells to stretch and orient in depressururization direction. This study proposed a novel method for fabricating PBS nano‐microcellular foams.

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Section: Resultsmentioning

confidence: 96%

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Zhang

Wang

et al. 2018

Polymers for Advanced Techs

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“…For these reasons, many studies focused on the modification of TPU with the aim to improve its rheological and crystalline properties and thereby reducing the shrinkage of foams. [12][13][14][15][16][17][18] Although, there has been some work on the foaming of TPU and its modified materials, there is very limited literatures reported the processing of ETPU bead foams, especially in the effects of the foaming process parameters on ETPU shrinkage performance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of foaming process parameters on expanded thermoplastic polyurethane bead foams properties using response surface methodology

Zhou

Wang

2018

J of Applied Polymer Sci

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Expanded thermoplastic polyurethane (ETPU) bead foams were fabricated by batch foaming with supercritical CO2 as blowing agent. On the basis of single factor investigation, the response surface methodology based on Box‐Behnken Design was used to investigate the influences of saturation pressure, temperature, and soaking time and their interactions on foaming behavior of ETPU. The results showed that saturation temperature was the most significant parameter affecting the expansion ratio, shrinkage ratio, and cell morphology of ETPU. Moreover, there was an interaction effect between saturation temperature and soaking time, wherein the expansion ratio of ETPU was more sensitive to change of soaking time at higher temperature. As the soaking time increased, the shrinkage of ETPU increased firstly and then leveled off, and the cell diameter decreased significantly. By applying the response surface methodology optimization, ETPU bead foams with final expansion ratio of 8.04, mean cell diameter of 74.2 μm, and average cell density of 1.46 × 107cell/cm3 can be obtained while the optimum conditions at saturation pressure of 15 MPa, saturation temperature of 100 °C and soaking time for 60 min. In addition, the dual melting peak of ETPU characteristics demonstrated that it is suitable for steam‐chest molding technology. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46327.

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“…Polyurethane elastomer (PUE) is mainly composed of hard and soft segments, and the soft segments are usually polyols, while the hard segments are generally isocyanates and chain extenders. Because of its excellent elasticity, radiation resistance, abrasion resistance, and low temperature resistance, PUE is widely used in many industries, such as mining, machinery, construction, and auto‐making . But PUE is easy to burn in air and produces toxic gases, such as HCN and CO, which can cause serious harm to human health and the environment.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

Liu

et al. 2018

Polymers for Advanced Techs

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A novel type of ZIF‐8/α‐ZrP (zeolitic imidazolate frameworks‐8/α‐zirconium phosphate) hybrid was obtained through surface modification of α‐ZrP by ZIF‐8 and was characterized. Subsequently, ZIF‐8/α‐ZrP was added to polyurethane elastomer (PUE) by simple blending, and the thermal behavior, flame retardancy, and smoke suppression properties of the ZIF‐8/α‐ZrP hybrid on PUE were studied. Compared with pure PUE, the test results showed that the char yield of the ZIF‐8/α‐ZrP/PUE composite at 700°C and its Tg values were increased, respectively. The peak heat release rate and total heat release of the ZIF‐8/α‐ZrP/PUE composite decreased by 69.6% and 45.6%, respectively. Meanwhile, its smoke production rate and total smoke production decreased by 59.3% and 40.5%, respectively. The improved flame retardancy and smoke suppression were primarily ascribed to the physical barrier and catalytic carbonization effects of α‐ZrP. Furthermore, the metal oxide decomposed by ZIF‐8 could further facilitate the production of char residue and raise the compactness of the char layer.

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Characterization of hard-segment crystalline phase of thermoplastic polyurethane in the presence of butane and glycerol monosterate and its impact on mechanical property and microcellular morphology

Cited by 68 publications

References 55 publications

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Investigation of the effect of foaming process parameters on expanded thermoplastic polyurethane bead foams properties using response surface methodology

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

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Characterization of hard-segment crystalline phase of thermoplastic polyurethane in the presence of butane and glycerol monosterate and its impact on mechanical property and microcellular morphology

Cited by 68 publications

References 55 publications

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO2

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO2

Investigation of the effect of foaming process parameters on expanded thermoplastic polyurethane bead foams properties using response surface methodology

Surface modification of α‐zirconium phosphate by zeolitic imidazolate frameworks‐8 and its effect on improving the fire safety of polyurethane elastomer

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Product

Resources

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Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂

Fabrication‐controlled morphology of poly(butylene succinate) nano‐microcellular foams by supercritical CO₂