Based on the goal to improve the humidity index of the
microenvironment
and enhancing human comfort, this study used electrospinning to prepare
several photoresponsive films with reversible regulation of wettability
and microenvironmental humidity from copolymers of acrylated spiropyran
(SPA), N-isopropylacrylamide (NIPAm), and methyl
methacrylate (MMA). According to the photoisomerization mechanism
of spiropyran, the simple ultraviolet (UV)–visible light (vis)
reversible light radiation change makes the spiropyran unit switch
between the polar ring-opened form and the nonpolar ring-closed form.
Utilizing this transition can easily regulate the wettability of the
film surface and microenvironmental humidity. The experimental results
show that poly(SPA1-co-NIPAm2-co-MMA8) nanowire film has the best
ability to regulate wettability and humidity; the wettability can
vary within a range of 13° and the microenvironmental humidity
up to 7.2%.