Polymer Pressure-Sensitive Adhesive with A Temperature-Insensitive Loss Factor Operating Under Water and Oil

Loss factor tan delta determines the viscoelasticity of a material. Higher or lower loss factor tan delta (>1 or <1) suggests a viscous or elastic material. Most polymer pressure-sensitive adhesives (PSAs) possess a limited operational temperature range (near room temperature), above which the PSAs trend to be more viscous (un-crosslinked) or more elastic (crosslinked), and below which PSAs become more elastic. These properties are unfavorable for PSA operation. Herein, an underwater PSA possessing short hydrophobic side chains and weak hydrogen bond interactions are described. Proper modulus and stable loss factor close to 1 contributes to an efficient adhesion underwater over a temperature range of 0-100 degrees C. Moreover, by introducing Teflon particles, the adhesion can be operated under silicon oil from room temperature to 150 degrees C due to the formation of a drainage surface structure and its temperature insensitivity.

Automated summary

The loss factor tan delta determines the viscoelasticity of a material, with higher or lower values indicating viscous or elastic properties. Most polymer pressure-sensitive adhesives (PSAs) have limited operational temperature ranges, affecting their viscosity and elasticity. A new underwater PSA with short hydrophobic side chains and weak hydrogen bond interactions shows promising adhesion efficiency underwater over a temperature range of 0-100 degrees C, and with the addition of Teflon particles, the adhesion can operate under silicon oil up to 150 degrees C.