Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks
Abstract Smart adhesives that undergo reversible detachment in response to external stimuli can be utilized for clean debonding on demand or for multi‐use purposes. Herein, robust and multi‐use adhesives are developed based on liquid crystal polymer networks. By controlling the glass transition temp...
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| Format: | Article |
| Language: | English |
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Wiley-VCH
2024-12-01
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| Series: | Advanced Materials Interfaces |
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| Online Access: | https://doi.org/10.1002/admi.202400488 |
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| author | Hongye Gou Shenghui Hou Mohand O. Saed |
| author_facet | Hongye Gou Shenghui Hou Mohand O. Saed |
| author_sort | Hongye Gou |
| collection | DOAJ |
| description | Abstract Smart adhesives that undergo reversible detachment in response to external stimuli can be utilized for clean debonding on demand or for multi‐use purposes. Herein, robust and multi‐use adhesives are developed based on liquid crystal polymer networks. By controlling the glass transition temperatures (Tg), dry liquid crystal adhesives are fabricated with Tg ranging from 14 to 28 °C. These adhesives exhibit low tackiness at room temperature; however, upon heating and annealing, they can be activated, enabling effective deployment. The adhesion tack force increased after annealing from 1 to 7 N for liquid crystal network formulation with a high Tg (28 °C). At the same time, there is no noticeable change for formulations with Tg lower than room temperature. All formulations exhibit high adhesion strength (peel force) in the nematic region (1.0 to 1.6 Nmm−1) and low peel force in the isotropic region. Furthermore, the adhesives demonstrate the capability for reuse in more than five heating and cooling peeling cycles and have shown remarkable contamination tolerance to sand, oil, and dirt. Moreover, these adhesives display lap shear strengths comparable to those of traditional PSAs, reaching up to 3 MPa, with clean detachment except for the formulation with low Tg, which exhibited cohesive failure. |
| format | Article |
| id | doaj-art-64c4e0fada22462eb268384475b0cf2f |
| institution | OA Journals |
| issn | 2196-7350 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Wiley-VCH |
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| series | Advanced Materials Interfaces |
| spelling | doaj-art-64c4e0fada22462eb268384475b0cf2f2025-08-20T02:32:12ZengWiley-VCHAdvanced Materials Interfaces2196-73502024-12-011136n/an/a10.1002/admi.202400488Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer NetworksHongye Gou0Shenghui Hou1Mohand O. Saed2Cavendish LaboratoryUniversity of CambridgeJ. J. Thomson AvenueCambridgeCB3 0HEUKCavendish LaboratoryUniversity of CambridgeJ. J. Thomson AvenueCambridgeCB3 0HEUKCavendish LaboratoryUniversity of CambridgeJ. J. Thomson AvenueCambridgeCB3 0HEUKAbstract Smart adhesives that undergo reversible detachment in response to external stimuli can be utilized for clean debonding on demand or for multi‐use purposes. Herein, robust and multi‐use adhesives are developed based on liquid crystal polymer networks. By controlling the glass transition temperatures (Tg), dry liquid crystal adhesives are fabricated with Tg ranging from 14 to 28 °C. These adhesives exhibit low tackiness at room temperature; however, upon heating and annealing, they can be activated, enabling effective deployment. The adhesion tack force increased after annealing from 1 to 7 N for liquid crystal network formulation with a high Tg (28 °C). At the same time, there is no noticeable change for formulations with Tg lower than room temperature. All formulations exhibit high adhesion strength (peel force) in the nematic region (1.0 to 1.6 Nmm−1) and low peel force in the isotropic region. Furthermore, the adhesives demonstrate the capability for reuse in more than five heating and cooling peeling cycles and have shown remarkable contamination tolerance to sand, oil, and dirt. Moreover, these adhesives display lap shear strengths comparable to those of traditional PSAs, reaching up to 3 MPa, with clean detachment except for the formulation with low Tg, which exhibited cohesive failure.https://doi.org/10.1002/admi.202400488liquid crystal elastomerspressure sensitive adhesiveresponsive polymersreversible bondingsmart adhesion |
| spellingShingle | Hongye Gou Shenghui Hou Mohand O. Saed Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks Advanced Materials Interfaces liquid crystal elastomers pressure sensitive adhesive responsive polymers reversible bonding smart adhesion |
| title | Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks |
| title_full | Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks |
| title_fullStr | Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks |
| title_full_unstemmed | Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks |
| title_short | Strong, Reversible, Heat‐Activated Adhesion from Liquid Crystal Polymer Networks |
| title_sort | strong reversible heat activated adhesion from liquid crystal polymer networks |
| topic | liquid crystal elastomers pressure sensitive adhesive responsive polymers reversible bonding smart adhesion |
| url | https://doi.org/10.1002/admi.202400488 |
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