Bio-Based Self-healing Thermoset Polyurethane Based on Pseudo-Tannin

Soleimani, Adel; Khakbaz, Mobina; Tavakoli, Negar; Sadeghi, Gity Mirmohamad

doi:10.1007/978-3-030-45085-4_156

Cited by 2 publications

(2 citation statements)

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“…Thermally self‐repairing phenolic polyurethanes with certain reversible urethane bonds derived from different phenols containing different substituent groups have been synthesized. These thermosetting polyurethanes, as well as bulk structures with self‐healing groups, could be self‐healed by heat and renewable resources [39–44] …”

Section: Introductionmentioning

confidence: 99%

“…These thermosetting polyurethanes, as well as bulk structures with self-healing groups, could be self-healed by heat and renewable resources. [39][40][41][42][43][44] This idea inspired me; this research aimed to produce hybrid self-healing polyurethanes with three mechanisms of self-healing (dangling chain self-healing, chemical self-healing, hydrogen bonds self-healing). Also, thermal stability, crystallinity, crosslink density, and self-healing properties of the three synthesized polyurethanes were analyzed and compared.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Characterization and Thermal Properties of Intrinsic Self‐Healing Polyurethane Nanocomposites

Soleimani

Sadeghi

2022

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A hybrid thermo-reversible crosslinking polyurethane nanocomposite containing 0.5, 1, and 2 wt.% of nano-silica was prepared with three intrinsic self-healing bonds (reversible covalent bonds supported by intrinsic hydrogen bonds and dangling chains). Owing to the introduction of pseudo-tannin and polyester diol that could form phenol-urethane networks and using nano-silica that causes dangling chains and hydrogen bonds, the prepared polyurethanes are capable of being reversed at 110 °C and rejoin at low temperatures. Thermoset self-healing polyurethane nanocomposites are prepared from pseudo-tannin, nano-silica, and a urethane-based prepolymer. The investigations of chemical structure, self-healing behavior, and cross-link network are carried out by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC) technique, and swelling test. dissociation of phenolic urethane at 110 °C was confirmed by temperature variable FTIR. By swelling test, it was found that the self-healing polyurethane nanocomposites with 0.5 wt.% of nano-silica have the most hard-domain, gel content, and crosslink density in the samples. DSC technique shows that polyurethane samples have two heat transfer transitions (dangling chains and self-healing). Thermogravimetric analysis (TGA) findings show that nanocomposites decompose at elevated temperatures than neat PU, and the rate of degradation diminishes as silica content increases.

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Section: Introductionmentioning

confidence: 99%