Liquid marbles have been shown to be a novel micro-reactor to synthesize polyperoxides by the radical alternating copolymerization of the 1,3-diene monomer with oxygen in a good yield. Oxygen gas is effectively absorbed as a comonomer by the large and permeable gas-liquid interface of the liquid marbles.
Tannic acid, a polyphenol of natural origin, assembled in alternation with polyelectrolytes via the layer-by-layer method retains its ability to scavenge free radicals. Kinetics of 2,2′-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) cation-radical bleaching by tannic acid/polyelectrolyte films depend on multilayer architecture, while total radical scavenging capacity depends on the amount of adsorbed TA.
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.
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