Self-Healing Thermoset Polyurethanes Driven by Host–Guest Interactions Between α-Cyclodextrin and Poly(ethylene glycol) Monomethyl Ether or Dodecanol Moieties
Self-healing thermoset polymers have attracted significant attention because they contribute to resource and energy savings by extending their service life. The reactions between glycerol ethoxylate (GCE), <i>α</i>-cyclodextrin (<i>α</i>-CD), poly(ethylene glycol) monomethyl...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/9/1941 |
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| Summary: | Self-healing thermoset polymers have attracted significant attention because they contribute to resource and energy savings by extending their service life. The reactions between glycerol ethoxylate (GCE), <i>α</i>-cyclodextrin (<i>α</i>-CD), poly(ethylene glycol) monomethyl ether (MPEG), and hexamethylene diisocyanate (HDI) at molar ratios of GCE:<i>α</i>-CD:MPEG = <i>a</i>:<i>b</i>:<i>c</i> produced polyurethane networks (GCM-<i>abc</i>, <i>abc</i> = 311, 411, and 511) containing α-CD and MPEG as host and guest moieties, respectively. To compare this with GCM-411, 1-dodecanol (DN) was used instead of MPEG as a guest molecule to yield a polyurethane network (GCD-411). Dynamic mechanical analysis revealed the formation of a polymer network, and the loss tangent (tan <i>δ</i>) peak temperature (<i>T</i><sub>α</sub>) and crosslinking density (<i>ν</i><sub>e</sub>) decreased with increasing GCE fraction for GCMs, and the <i>T</i><sub>α</sub> and <i>ν</i><sub>e</sub> values of GCD were slightly higher than those of GCM-411. The tensile strength of the GCMs decreased with increasing GCE fraction, and the tensile strength of GCD-411 was slightly higher than that of GCM-411. All cured films were healed at room temperature for 24 h, and the healing efficiency (<i>η</i><sub>σ</sub>), based on tensile strength, increased in the order of GCM-311 < GCM-411 < GCM-511 < GCD-411. When the healing temperature increased from room temperature to 80 °C, <i>η</i><sub>σ</sub> increased from 24–38% to 45–62%. GCM-411 and GCD-411 were self-healed thrice by treatment at 80 °C, and <i>η</i><sub>σ</sub> gradually decreased with each healing cycle. |
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| ISSN: | 1420-3049 |