Abstract
Developing high-performance elastomers with distinctivefeaturesopens up new vistas and exciting possibilities for information encryptionbut remains a daunting challenge. To surmount this difficulty, anunprecedented synthetic approach, "modular molecular engineering",was proposed to develop tailor-made advanced elastomers. The customizedhydrophobic poly(urea-urethane) (HPUU-R) elastomer perfectly integratedultrahigh tensile strength (& SIM;75.3 MPa), extraordinary toughness(& SIM;292.5 MJ m(-3)), satisfactory room-temperaturehealing, high transparency, puncture-, scratch-, and water-resistance;and miraculously, its 0.20 g film could lift objects over 100 000times its weight without rupture. Intriguingly, we unexpectedly discoveredthat the elastomers fluoresce brightly at the optimal excitation wavelengthattributed to the "clusterization-triggered emission".Based on the gradient hydrophobicity and fluorescent properties ofHPUU-R, a hierarchical information encryption/decryption mode wasinnovatively established. Using high-performance HPUU-R as a doubleencryption platform makes the information highly stable and persistent,thus providing a stronger guarantee for the encrypted information.More attractively, given the impressive recyclability and self-healingof HPUU-R, information encryption can be realized by using recycledelastomers, injecting new vitality into green and sustainable development.

Published in ACS APPLIED MATERIALS & INTERFACES,Volume15,10.1021/acsami.3c09133;AUG 22 2023