Photochromic materials have attracted
considerable attention due
to their potential applications in information encryption, intelligent
sensors, and environmental monitoring. However, the preparation of
photochromic materials with self-healing properties and high strength
still poses significant challenges. Herein, a photochromic polyurethane
(RBPU-8) with self-healing properties and high strength was synthesized
by copolymerizing 2,6-pyridinedimethanol (PDM), boric acid (BA), poly(tetrahydrofuran)
1000 (PTMEG 1000), isophorone diisocyanate (IPDI), and N-(rhodamine-B) lactam-1,2-ethylenediamine (RBNH2). The
RBPU-8 photochromic elastomer not only shows a sensitive light response
rate and excellent self-healing efficiency (93%) but also exhibits
superior mechanical strength (45.5 MPa), high toughness (231.5 MJ
m–3), and good fracture energy (188.7 KJ m–2). In addition, multiple recyclable stickers and wearable devices
based on RBPU-8 elastomer materials were successfully fabricated for
UV detection and prevention.