On the use of solubility parameters to investigate phase separation-morphology-mechanical behavior relationships of TPU

Gallu, Raïssa; Méchin, Françoise; Dalmas, Florent; Gérard, Jean‐François; Perrin, Rémi; Loup, Frédéric

doi:10.1016/j.polymer.2020.122882

Cited by 49 publications

(46 citation statements)

References 65 publications

(94 reference statements)

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“…As shown inFigure 2, large changes of the storage modulus could be evidenced by changing the HS content. Increasing the HS content of the TPU from 13 to 30 wt% leads to an increase in the storage modulus in the rubbery state (from 1 MPa to 5 MPa at 50 °C, respectively).The presence of nanodomains of associated hard segments, acting as reinforcing fillers, in TPU explains the increase of the modulus at the rubbery plateau as the hard segment content increases (see TEM images and SAXS profiles obtained for all TPU inFigure S2and S3 respectively in SI, published in a separated article[60]). Similar results have been reported in the literature for TPU with closely-related chemical structures[61].…”

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confidence: 90%

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Gallu

Méchin

Dalmas

et al. 2020

Construction and Building Materials

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confidence: 90%

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Gallu

Méchin

Dalmas

et al. 2020

Construction and Building Materials

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“…However, with the increase of the content of polyether-based TPU, the small particles that were originally uniformly dispersed were aggregated into relatively large clusters. It is proven that the organic molecular chain in the modifier can be embedded into the layered structure, which can promote the formation of the cross-linked structure in polyether-based TPU, so as to improve the low temperature resistance of the asphalt binder (Gallu et al, 2020).…”

Section: Fluorescence Microscopementioning

confidence: 99%

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

Jin

Sun²,

Guo

et al. 2021

Front. Mater.

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The objective of this study aims to investigate the performance of thermoplastic polyurethane elastomers (TPU)-modified asphalt, with special focus on the influence of polyurethane synthesis parameters upon the performance of base asphalt. In this study, the TPU modifier was incorporated into base asphalt to prepare TPU-modified asphalt by using a self-determined laboratory process. The properties of polyester-based TPU and polyether-based TPU modified asphalt with different contents was analyzed by the base performance tests. The Fourier transform infrared spectroscopy (FTIR), fluorescent microscope, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermal gravity (TG), dynamic shear rheology (DSR), and bending beam rheology (BBR) tests were conducted to expose chemical, microstructure, and rheological properties of the asphalt binders, respectively. The results indicated that the modified asphalt with 5% TPU modifier exhibited a favorable performance in terms of the penetration, ductility, softening point, and rotational viscosity, respectively. The isocyanate and polyol reacted to form carbamate in the TPU-modified asphalt, and moreover the isocyanate and aromatic compounds reacted to form halohydrins in the asphalt. Large particles contained in the polyester-based TPU-modified asphalt increased obviously with the increase of Ch (Hard segment content) and r (Isocyanate root index, molar ratio between NCO and OH) value, the fracture mode of it subjected to external load indicated a typical brittle fracture. The content of MDI in the synthesized polyurethane modifier was an important factor affecting the high-temperature stability of the modified asphalt. The polyester-based TPU modifier had a better high temperature performance than the polyether-based TPU modifier. The polyether polyol chain segment showed a greater flexibility as compared to polyester polyol; the addition of polyether polyols can be effectively offset of MDI chain rigidity as r ≤ 1 and Ch < 40% leading to the improvement of the viscoelastic property of asphalt. When Ch = 40% and r = 0.95, the polyether-based TPU-modified asphalt exhibited the same high-temperature grade as the polyester-based TPU-modified asphalt, whereas the polyether-based TPU-modified asphalt showed obviously higher low temperature grades. The polyester-based TPU with Ch = 40% and r = 1 can be used as a modifier to increase the durability of asphalt binders.

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“…Stress–strain measurements for an elastomeric polyurea in uniaxial tension over a range of strain rates from 0.06 to 573 s −1 using a drop test instrument was reported by Roalnd 12 . Raïssa Gallu et al 13 investigated phase separation‐morphology‐mechanical behavior relationships of TPU by using of Hansen'' solubility parameters. Van Ekeren et al 14 investigated three transparent polyurethane samples by using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) to evaluate the potential use in transparent armor.…”

Section: Introductionmentioning

confidence: 99%

Investigation of tensile behavior and molecular structure of the thermoplastic polyurethane sheets injection molded at different mold temperatures

Xiang

Zhang

Zheng

et al. 2021

J of Applied Polymer Sci

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This paper aims to investigate the influence of the mold temperature on the mechanical responses at different ambient temperature and molecular structure of the injection molded TPU sheets. The tensile properties of the TPU sheets prepared at different mold temperatures were obtained at different ambient temperatures. As the mold temperature increases, both the elongation at break and tensile strength of the specimens increase. The specimens show yield behavior during stretching at −30 and −50°C. The microstructure of the TPU sheets was characterized by DMA, AFM, and birefringence. The results show that the higher mold temperature can reduce the aggregation of hard domains because of the higher mobility of the hard segments. In‐situ SAXS and WAXS measurements were carried out at −30°C test temperature to exhibit the evolution of the microstructure during stretching. When the specimens are prepared at 40°C mold temperature, the hard domains are destroyed and difficult to orient along the stretching direction. In contrast, the hard domains begin to be deformed and oriented along the stretching direction above the yield strain when the specimens molded at higher mold temperature. The above microstructure evolution is consistent with the tensile behavior of the TPU specimens.

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On the use of solubility parameters to investigate phase separation-morphology-mechanical behavior relationships of TPU

Cited by 49 publications

References 65 publications

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Rheology-morphology relationships of new polymer-modified bitumen based on thermoplastic polyurethanes (TPU)

Influence on Polyurethane Synthesis Parameters Upon the Performance of Base Asphalt

Investigation of tensile behavior and molecular structure of the thermoplastic polyurethane sheets injection molded at different mold temperatures

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