Designing an elastomeric polyurethane coating with enhanced mechanical and self-healing properties: The influence of disulfide chain extender

Yarmohammadi, Masoud; Shahidzadeh, Mansour; Ramezanzadeh, Bahram

doi:10.1016/j.porgcoat.2018.04.009

Cited by 50 publications

(27 citation statements)

References 40 publications

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“…20,30 The dynamic behaviour of the aromatic disulfide at reduced temperatures has subsequently been explored by several groups in the area of self-healing. [31][32][33] For example, using the same disulfide Yang et al synthesized a PU elastomer with improved tensile strength for which self-healing could be induced by heating to 60 °C. They observed that for more cross-linked materials a higher tensile strength was obtained, but this occurred with a concomitant lowering of the ability to self-heal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mechanically strong waterborne poly(urethane-urea)s capable of self-healing at elevated temperatures

Nevejans

Ballard

Rivilla

et al. 2019

European Polymer Journal

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Although various chemistries have been introduced into polyurethanes in order to obtain self-healing abilities, implementing these materials in applications requiring high strength is challenging as strong materials imply a limited molecular motion, but without movement of polymer chains self-healing is not possible. Here, waterborne poly(urethane-urea)s (PU(U)s) based on aromatic disulfide compounds are developed which balance these contradictory requirements by presenting good mechanical properties at room temperature, while showing the mobility necessary for healing when moderately heated. The influence of hard monomers on the stability and mobility of the materials is investigated by qualitative scratch closure and rheological measurements, so that the limits of the readily available aromatic disulfide compounds, bis(4-aminophenyl)-and bis(4hydroxyphenyl)disulfide, can be determined. Subsequently, a modified aromatic disulfide compound, bis[4-(3'-hydroxypropoxy)phenyl]disulfide, with increased reactivity, solubility and flexibility is synthesized and incorporated into the PU backbone, so that materials with more attractive mechanical properties, reaching ultimate tensile strengths up to 23 MPa, and self-healing abilities could be obtained.

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Section: Introductionmentioning

confidence: 99%

Synthesis of mechanically strong waterborne poly(urethane-urea)s capable of self-healing at elevated temperatures

Nevejans

Ballard

Rivilla

et al. 2019

European Polymer Journal

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“…In addition, dynamic mechanical thermal analysis (DMTA) can also disclose the existence of exchange reactions for disulfide bonds. 40 Although all the above-mentioned methods can characterize the self-healing phenomenon, self-healing process analysis of microcracks is still lacking. Hence, a kinetic approach to observe microcracks was established, and the self-healing mechanism for SHWPUs was also improved, which could be an effective way to gain further comprehension of the self-healing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Mechanism of Microcracks on Waterborne Polyurethane with Tunable Disulfide Bond Contents

2019

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Self-healing mechanism of microcracks on waterborne polyurethane (WPU) with varied disulfide bond contents was investigated thoroughly in this paper. The self-healing process could be observed by an optical microscope, which was divided into two steps. The first step was the cohesive healing movement, closely related with microphase separations and further characterized by the Fourier transform infrared peak fitting, differential scanning calorimetry, and dynamic mechanical thermal analysis. The second step of the exchange reactions of disulfide bonds could be confirmed by the in situ Raman and tensile mechanics. In addition, the cohesive healing behavior was quantitatively described by the kinetic method, and the exchange reaction active energies of disulfide bonds were also calculated to be 20.42 kJ/mol by gel permeation chromatography tests. The best self-healing performance of SHWPUs was WPU-8, and it could be healed at 75 °C in 15 min with 100% self-healing efficiency. Combining the self-healing process observation with the kinetic analysis can provide deep insights into the self-healing mechanism of microcracks.

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“…Low glass transition temperature (−75°C), hydrolytic stability, low moisture permeation, resistance to acidic solutions and bases, high loading capacity for solid particles, great hydrophobicity, long age at low temperatures make this polyol desirable in many researches . Recently, development of the self‐healing HTPB‐based polyurethane coatings has been considered to increase the efficiency of this polyurethane as pipelines coatings . In addition, preparation of the membrane using HTPB‐based polyurethane is highlighted in the separation of the liquids and gases for more than two decades .…”

Section: Introductionmentioning

confidence: 99%

“…9 Recently, development of the selfhealing HTPB-based polyurethane coatings has been considered to increase the efficiency of this polyurethane as pipelines coatings. 10 In addition, preparation of the membrane using HTPB-based polyurethane is highlighted in the separation of the liquids and gases for more than two decades. [11][12][13][14][15][16][17] However, the effects of the oxidation on the aging and the microstructure of this resin are undeniable.…”

Section: Introductionmentioning

confidence: 99%

“…In continuation of our studies on HTPB and its elastomers, the antioxidant activity of A.O.2246 and 3‐hydroxy pyridines on HTPB resin is investigated to explore a substitution compound for A.O.2246. In this regard, a mixture of two antioxidants (1:1) was added to the HTPB resin and the thermal‐oxidative behavior of this mixture was evaluated by the simultaneous thermal analysis (STA) test Scheme .…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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The effect of the mixture of two antioxidants has been evaluated on the thermal‐oxidant degradation of the hydroxyl‐terminated polybutadiene (HTPB) because of its importance in the coatings and adhesives industries. 2,2‐Methylene bis(4‐methyl‐6‐tertiarybutylphenol) or A.O.2246 and 3‐hydroxy pyridine have been considered as antioxidants in this study as a common HTPB antioxidant and an active antioxidant, respectively. The thermal‐oxidant degradation behavior of the HTPB has been investigated in the presence of a mixture of two antioxidants by TGA and DTG tests, and, subsequently, the results of these tests have been interpreted by two model‐free methods, e.g., Kissinger–Akahira–Sunose and Friedman methods. The results revealed that the mixture of two antioxidants affected the activation energy of the thermal‐oxidant degradation reaction of the HTPB. The calculated activation energy value obtained from the Kissinger–Akahira–Sunose method was about 199 ± 1 kJ⋅mol−1. In addition, the Ea value at various conversion rates has also been calculated by using the Friedman method. This method showed that the highest Ea value in the thermal‐oxidant degradation reaction belonged to the initiation step of the reaction (about 299 kJ⋅mol−1). Moreover, the lowest activation energy value was correlated to the second step of the degradation reaction at a conversion rate of 0.6 (about 184 kJ⋅mol−1).

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Designing an elastomeric polyurethane coating with enhanced mechanical and self-healing properties: The influence of disulfide chain extender

Cited by 50 publications

References 40 publications

Synthesis of mechanically strong waterborne poly(urethane-urea)s capable of self-healing at elevated temperatures

Synthesis of mechanically strong waterborne poly(urethane-urea)s capable of self-healing at elevated temperatures

Self-Healing Mechanism of Microcracks on Waterborne Polyurethane with Tunable Disulfide Bond Contents

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

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