Thermoreversible adhesives with preciselytemperature-controlled detachment enabled by temperature-responsive crystallinedomains

Wenwei Yang, Yubing Fu, SiyuGan, Xueling Yan, Liwei Lu, Xinyu Chen, Lan Liu*

Abstract

Thermoreversible adhesives allow for on-demand bondingand debonding on diverse surfaces through thermal stimulation. They have greatpotential in applications such as temporary fixation, which helps lower productcosts and meet the requirements for environmental protection. However, theexisting thermoreversible adhesive materials face challenges such as imprecisethermal switching, excessively high detachment temperatures, or poor bondingstability. To address these issues, here, we innovatively introduce temperature-responsivecrystalline domains with an appropriate melting temperature (Tm) into theadhesive. These crystalline domains stabilize the adhesive network, therebyenabling it to maintain the high lap shear strength of the adhesive across awide range. However, above Tm, close to the glass transition temperature (Tg)of the amorphous domains, it causes rapid softening and bonding failure.Therefore, the prepared thermoreversible adhesive simultaneously achieves highlap shear strength (5.38 MPa), reliable bonding stability over the normaloperating temperature range (>75% of initial value, 30–70 °C), suitablethermal detachment temperature (∼80°C, 0.66 MPa), and high environmental reliability. This work provides afeasible strategy for designing precision thermoreversible adhesives, which isconducive to promoting the application of thermoreversible adhesives inscenarios such as temporary fixation.

文章链接：

https://doi.org/10.1039/D6MH00017G