Synthesis of NR based Polyurethanes containing phosphorylated polymers as chain extenders

Baratha, Krishna; Nourry, Arnaud; Pilard, Jean‐François

doi:10.1016/j.eurpolymj.2015.07.030

Cited by 10 publications

(7 citation statements)

References 39 publications

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“…Raman spectra of TPU, GE powder before processing, and GE in the fabricated porous structures are reported in Figure 4. The spectrum of pristine TPU shows the typical peaks of polyurethane, including the absorption peak of aromatic rings (1470-1440 cm −1 ), the absorption peak at 1665 cm −1 corresponding to the C=C stretching, the C=O bending peak of the ester group at 1740 cm −1 , and the peak at about 3000 cm −1 due to C-H bonds [36]. In the Raman spectrum of graphene, it is possible to observe the G (1580 cm −1 ) band, which is a primary in-plane vibrational mode of carbon-carbon bonds in graphene sheets, the D (1350 cm −1 ) band ascribed to disordered carbon in graphene and 2D (2690 cm −1 ) band, which is a second-order overtone of D band ascribed to AB-stacked graphene (where AB-Stacked refers to misorientation of graphene nanoplatelets) [37].…”

Section: Chemical-physical and Morphological Characterization Of The mentioning

confidence: 99%

Selective Laser Sintering Fabricated Thermoplastic Polyurethane/Graphene Cellular Structures with Tailorable Properties and High Strain Sensitivity

et al. 2019

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Electrically conductive and flexible thermoplastic polyurethane/graphene (TPU/GE) porous structures were successfully fabricated by selective laser sintering (SLS) technique starting from graphene (GE)-wrapped thermoplastic polyurethane (TPU) powders. Several 3D mathematically defined architectures, with porosities from 20% to 80%, were designed by using triply periodic minimal surfaces (TMPS) equations corresponding to Schwarz (S), Diamond (D), and Gyroid (G) unit cells. The resulting three-dimensional porous structures exhibit an effective conductive network due to the segregation of graphene nanoplatelets previously assembled onto the TPU powder surface. GE nanoplatelets improve the thermal stability of the TPU matrix, also increasing its glass transition temperature. Moreover, the porous structures realized by S geometry display higher elastic modulus values in comparison to D and G-based structures. Upon cyclic compression tests, all porous structures exhibit a robust negative piezoresistive behavior, regardless of their porosity and geometry, with outstanding strain sensitivity. Gauge factor (GF) values of 12.4 at 8% strain are achieved for S structures at 40 and 60% porosity, and GF values up to 60 are obtained for deformation extents lower than 5%. Thermal conductivity of the TPU/GE structures significantly decreases with increasing porosity, while the effect of the structure architecture is less relevant. The TPU/GE porous structures herein reported hold great potential as flexible, highly sensitive, and stable strain sensors in wearable or implantable devices, as well as dielectric elastomer actuators.

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Section: Chemical-physical and Morphological Characterization Of The mentioning

confidence: 99%

Selective Laser Sintering Fabricated Thermoplastic Polyurethane/Graphene Cellular Structures with Tailorable Properties and High Strain Sensitivity

et al. 2019

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“…FTIR spectra of both cWPU and cWPU added EG samples were shown in the Figure . The chemical structures of polyurethane shown as important functional groups were observed at 3302, 1707, 1602, 1538, and 1224 cm −1 assigned to NH stretching, CO ester stretching, NH bending of urethane position, NCO vibration of polyurethane linkage, and CO acyl stretching of urethane linkage, respectively . Moreover, the absorption band of cis ‐1,4 polyisoprene of NR is revealed in the wave numbers of 836 cm −1 corresponding to CH out of plane deformation …”

Section: Resultsmentioning

confidence: 97%

“…The chemical structures of polyurethane shown as important functional groups were observed at 3302, 1707, 1602, 1538, and 1224 cm 21 assigned to ANAH stretching, AC@O ester stretching, NAH bending of urethane position, ANAC@O vibration of polyurethane linkage, and CAO acyl stretching of urethane linkage, respectively. 17,29,38,43,44 Moreover, the absorption band of cis-1,4 polyisoprene of NR is revealed in the wave numbers of 836 cm 21 corresponding to @CAH out of plane deformation. 27,35 After adding EG into the active chain of cWPU to obtain the chain extender in the system, FTIR spectrum showed quite familiar spectrum of cWPU without EG, but there is a peak showed in the spectrum.…”

Section: Cwpu Filmsmentioning

confidence: 98%

Synthesis and characterization of novel natural rubber based cationic waterborne polyurethane—Effect of emulsifier and diol class chain extender

Sukhawipat

Saetung

Pilard

et al. 2017

J of Applied Polymer Sci

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Novel cationic waterborne polyurethanes (cWPU) were synthesized by step‐growth polymerization of hydroxyl telechelic natural rubber, molecular weight of 2800 g mol−1, toluene‐2,4‐diisocyanate, N‐methyl diethanolamine (NMDEA) as an emulsifier. The chemical structure of cWPU was confirmed by 1H‐nuclear magnetic resonance and Fourier transform infrared spectroscopy. The amounts of NMDEA and ethylene glycol under isocyanate (NCO) index of 100 on the properties of cWPU were studied. It was found that cWPU was stable under the concentration of NMDEA more than 1.50 mol and the particle sizes decreased with increasing of NMDEA content. Also, contact angle shows more hydrophilic materials by increasing of NMDEA. Extended cWPU was found in two ranges of nano size. Chain extender has strongly affected cWPU film formation, increasing of mechanical properties, and thermal properties. In addition, stress–strain curve and scanning electron microscopy image shows the change of behavior from soft elastic to ductile plastic by adding ethylene glycol. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45715.

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“…1,3‐Di‐ O ‐( tert ‐butyldimethylsilyl)propane‐2‐ol (22a): Following the general procedure A, the reaction was carried out with glycerol 22 (0.212 mmol), TEA (88.5 µL, 3.0 equiv. ), TBSCl (72.5 mg, 2.2 equiv.)…”

Section: Methodsmentioning

confidence: 99%

Using DMF as Both a Catalyst and Cosolvent for the Regioselective Silylation of Polyols and Diols

Luo

Zou

et al. 2019

Eur J Org Chem

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Highly regioselective silylation of primary hydroxyl groups of unprotected polyols and diols was obtained by the use of a mixed solvent of MeCN/DMF (10:1) in this study. DMF was discovered to be a good catalyst in this reaction, although the silylation using DMF as a solvent has been a common method for more than 40 years. The catalytic mechanism of DMF for the silylation was also proposed herein after intensive investigation of the reaction by NMR techniques. It has been demonstrated that a complex with a 1:1 ratio of the binding partners can be formed between TBSCl and DMF and has an association constant of 12/M, thus activating the silylation.

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Synthesis of NR based Polyurethanes containing phosphorylated polymers as chain extenders

Cited by 10 publications

References 39 publications

Selective Laser Sintering Fabricated Thermoplastic Polyurethane/Graphene Cellular Structures with Tailorable Properties and High Strain Sensitivity

Selective Laser Sintering Fabricated Thermoplastic Polyurethane/Graphene Cellular Structures with Tailorable Properties and High Strain Sensitivity

Synthesis and characterization of novel natural rubber based cationic waterborne polyurethane—Effect of emulsifier and diol class chain extender

Using DMF as Both a Catalyst and Cosolvent for the Regioselective Silylation of Polyols and Diols

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