Liquid marble containing degradable polyperoxides for adhesion force-changeable pressure-sensitive adhesives

Abstract

Liquid marbles containing a sticky polyperoxide were prepared by the in situ copolymerization of the 1,3-diene monomer with oxygen. The as-prepared liquid marbles had a non-sticky nature and could move on any substrates due to the presence of hard particles on their surfaces, while the squeezed liquid marble developed adhesion force-tunable PSA properties due to the outflow of the inner materials. The 180 peel strength of the squeezed liquid marble increased by heating at 90 C for 1 h or by UV irradiation at 0.86 J cm À2 because the cohesive force of the adhesive layer increased by the additional polymerization initiated by moderate decomposition of the polyperoxide. The increased 180 peel strengths were significantly decreased again to almost zero, i.e., dismantling, after an additional heating at 150 C for 1 h because of an excess increase in the cohesive force as pressure-sensitive adhesives, where cross-linking took place as a result of significant decomposition of the polyperoxide accompanied by hydrogen abstraction and coupling.

Stimuli‐Responsive Liquid Marbles: Controlling Structure, Shape, Stability, and Motion

“…Only after the application of mechanical stress is the adhesive nature observed. Adhesion is induced by rupture of the nanoparticle coating of the liquid marbles and outflow of the inner soft polymer (Figure b) . The PSA powder is expected to be particularly useful in bonding in confined and intricate spaces where sticky polymeric materials are difficult to apply because of their high viscosity.…”

“…Liquid marbles can be divided, merged, disrupted and levitated, and their contents (the inner liquid phase) can be mixed and released on demand. Because of the above‐mentioned properties, liquid marbles have gained increasing interest in view of their potential applications in cosmetics, transport & microfluidics, miniature reactors, personal & health care products, sensors, accelerometers, gas storage, and actuators . Several review articles have focused on the physical properties, handling and application of liquid marbles …”

Stimuli‐Responsive Bioinspired Materials for Controllable Liquid Manipulation: Principles, Fabrication, and Applications

“…Liquid marbles are soft objects formed by stabilizing liquid droplets in a shell of solid particles absorbed at the liquid–gas interface. Compared to bare liquid droplets, liquid marbles have many advantages, including reducing evaporation, avoiding contamination, and decreasing mobility friction, which make them attractive materials in various applications, such as cosmetics, microfluidics, biomedicine, and miniature reactors . Hydrophobic particles with a WCA > 90° are typically utilized as the stabilizer of the liquid marbles in which aqueous liquids are encapsulated.…”

Composition‐dependent crystallization behavior of copolyperoxides from methyl methacrylate and 4‐vinylbenzyl stearate

“…Generally four types of polyperoxides have been reported from the reaction of molecular oxygen with (i) vinyl monomers, (ii) 1,3‐diene monomers, (iii) dibenzofulvene, and (iv) 7,7,8,8‐tetrakis(ethoxycarbonyl)quinodimethane and related monomers . Recently, the synthesis of polyperoxides has been carried out by the polymerization of diene monomer and oxygen using liquid marble as an efficient macro‐reactor with neither stirring the reaction media nor oxygen bubbling during the course of a reaction . A macroinitiator from styrene having different peroxide groups was synthesized in presence of oxygen via radical polymerization .…”

“…[5] Recently, the synthesis of polyperoxides has been carried out by the polymerization of diene monomer and oxygen using liquid marble as an efficient macro-reactor with neither stirring the reaction media nor oxygen bubbling during the course of a reaction. [6] A macroinitiator from styrene having different peroxide groups was synthesized in presence of oxygen via radical polymerization. [7] Very recently, alternating copolymerization of cyclic conjugated diene monomers (furan and cyclopentadiene) with molecular oxygen have been carried out to prepare degradable polyperoxides.…”