Understanding the influence of hydrogen bonding and diisocyanate symmetry on the morphology and properties of segmented polyurethanes and polyureas: Computational and experimental study

Sami, Selim; Yıldırım, Erol; Yurtsever, Mine; Yurtsever, E.; Yılgör, Emel; Wilkes, Garth L.

doi:10.1016/j.polymer.2014.07.028

Cited by 127 publications

(107 citation statements)

References 32 publications

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“…The distinct bands in the C═O stretching region at ~1720, ~1702, and ~1696 cm −1 are assigned to free, disordered hydrogen bonded and ordered hydrogen bonded C═O, respectively . The percentage of each C═O absorption was obtained by comparing the specific peak area with the total peak area at each scan.…”

Section: Resultsmentioning

confidence: 99%

Self‐healing polyurethane based on disulfide bond and hydrogen bond

Jian

Zhou

et al. 2017

Polymers for Advanced Techs

144

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Tough and transparent polyurethane networks with self-healing capability at mild temperature conditions were successfully prepared in a 1-pot procedure. The self-healing ability of synthesized polyurethane comes from the covalent disulfide metathesis and non-covalent H-bonding.The mechanical testing indicates that disulfide metathesis reforms the covalent bonds on a longer time scale, while H-bonding gives rise to a healing efficiency of around 46% in the early healing processing. The compromise between mechanical performance and healing capability is reached by tailoring the concentration of disulfide. The tensile strength of the sample with 100% self-heal efficiency can get to 5.01 MPa, which can be explained by higher mobility of polymer chain under ambient temperature from creep testing. In order to increase the tensile strength of self-healing elastomer, the hydrogen bonding effect received attention. H-bonding is a kind of noncovalent self-healing trending force; the supermolecular selfhealing elastomer based on H-bonding interaction was firstly developed by Leibler and colleagues. 16,17 Other researchers also have similar reports. 18,19 Although the self-healing effect of H-bonding is limited, the contribution to the self-healing cannot be ignored.This work focuses on obtaining a material with good mechanical properties and self-healing in 1-pot method by adapting the disulfide concentration. The self-healing contribution of disulfide metathesis and H-bonding effect of this system were investigated. To the best of our knowledge, disulfide self-healing assisted H-bonding selfhealing materials have not been systematically studied.2 | EXPERIMENTAL | MaterialsPolytetramethylene ether glycol (PTMEG) with a number average molecular weight of 2000 g·mol −1 was provided by Aladdin IndustrialCorporation and was degassed for more than 3 hours at 90°C.

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Section: Resultsmentioning

confidence: 99%

Self‐healing polyurethane based on disulfide bond and hydrogen bond

Jian

Zhou

et al. 2017

Polymers for Advanced Techs

144

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“…Many authors have shown the interest of using a chain extender which is multifunctional additives that bind to the ends of different macromolecular fragments (carboxyl and hydroxyl groups in polyesters) thus extending the chain, increasing the average molar mass of the polymer and also can be used as a reactive compatibilizer in blends . Some of the extenders reported in literature are di‐ and multifunctional epoxides , diisocyanate compound , dianhydride , bisoxazolines , tris (nonyl‐phenyl) phosphate (TNPP) , and polycarbodiimide (PCDI) . Multifunctional epoxy compounds have been extensively used as chain extenders for polyesters.…”

Section: Introductionmentioning

confidence: 99%

Improvement of compatibility and mechanical properties of the poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) blends and films by reactive extrusion with chain extender

Yan

Yang

et al. 2017

Polymer Engineering & Sci

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Biodegradable poly(lactic acid)/poly(butylene adipate‐co‐terephthalate) (PLA/PBAT) blends and films were prepared by melt blending and blowing films technique in the presence of chain extender. The Joncryl ADR‐4370F (ADR) was used as the chain extender. The effect of ADR on the mechanical properties, rheological behavior, morphology, and thermal behavior of PLA/PBAT blends was investigated. The mechanical properties were markedly improved by incorporation of 0.15 phr ADR, for example, the elongation at break increased from 23.5% to 410.3% and the notched Izod impact strength increased from 7.5 to 33.4 KJ/m2 for the PLA/PBAT/ADR blends. The elongation at break increased from 17.7% to 264.6% and the tensile strength increased from 28.0 to 40.7 MPa for the PLA/PBAT/ADR films in the transverse direction. The tensile strength and tear strength of the films increased from 28.0 to 40.7 MPa and from 135.5 to 163.8 kN/m in the machine direction, respectively. Morphological observation through scanning electron microscopy revealed that the compatibility of the PLA/PBAT blends was greatly enhanced by the incorporation of ADR. The interfacial adhesion was improved between PLA phase and PBAT phase. These findings contributed new knowledge to the additives area and gave important implications for manufacturing biodegradable polymer packaging material. POLYM. ENG. SCI., 58:1868–1878, 2018. © 2017 Society of Plastics Engineers

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“…6,7 Inspired by the ability of supramolecular polymers to adjust the versatilities and response to environments, plenty of efforts have been made to understand the phase behaviors of supramolecular polymers. [8][9][10][11][12][13][14][15][16] A widely-studied system is the blends of AB-and B'C-diblock copolymers with B-and In addition to the experiments, theory and simulations were utilized to study the phase behavior M A N U S C R I P T…”

Section: Introductionmentioning

confidence: 99%