Synthesis and Study of Shape-Memory Polymers Selectively Induced by Near-Infrared Lights via In Situ Copolymerization

Abstract

Shape-memory polymers (SMPs) selectively induced by near-infrared lights of 980 or 808 nm were synthesized via free radical copolymerization. Methyl methacrylate (MMA) monomer, ethylene glycol dimethylacrylate (EGDMA) as a cross-linker, and organic complexes of Yb(TTA) 2 AAPhen or Nd(TTA) 2 AAPhen containing a reactive ligand of acrylic acid (AA) were copolymerized in situ. The dispersion of the organic complexes in the copolymer matrix was highly improved, while the transparency of the copolymers was negligibly influenced in comparison with the pristine cross-linked PMMA. In addition, the thermal resistance of the copolymers was enhanced with the complex loading, while their glass transition temperature, cross-linking level, and mechanical properties were to some extent reduced. Yb(TTA) 2 AAPhen and Nd(TTA) 2 AAPhen provided the prepared copolymers with selective photothermal effects and shape-memory functions for 980 and 808 nm NIR lights, respectively. Finally, smart optical devices which exhibited localized transparency or diffraction evolution procedures were demonstrated based on the prepared copolymers, owing to the combination of good transparency and selective light wavelength responsivity.

Development of light-induced shape memory polymers

“…目前已经制备了具 有可调尺寸的多种WO 3−x 纳米结构, 包括纳米纤维、 纳米线、球形颗粒, 其中WO 3−x 纳米线表现出优异的 近红外光吸收 [53] . 2019年北京大学的Wan团队 [54] Figure 19 (Color online) The application of shape memory composites in light controlled micropattern [30].…”

Novel 4D-printing pellets with infrared-light responsive shape memory effect

“…Common ultraviolet photosensitive groups include azobenzene group [19,21], cinnamic acid group [22][23][24][25], and anthracene group [26,27]. Infrared light-responsive SMPs are usually based on photo-thermal conversion of fillers [28][29][30][31][32]. For photo-thermal conversion fillers, various types have been explored, including carbon materials, metals and their compounds, organic dyes, and organic compounds/complexes.…”