From Event: SPIE Organic Photonics + Electronics, 2017
Liquid crystal (LC) provides a suitable platform to exploit structural motions of molecules in a condensed phase. Amplification of the structural changes enables a variety of technologies not only in LC displays but also in other applications. Until very recently, however, a practical use of LCs for removable adhesives has not been explored, although a spontaneous disorganization of LC materials can be easily triggered by light-induced isomerization of photoactive components. The difficulty of such application derives from the requirements for simultaneous implementation of the following essential requisites: (i) adequate strength for a temporary bond (more than 1 MPa) even under heating conditions, (ii) significant reduction of the bonding strengths by light irradiation, and (iii) quick photoresponse for the separation of bonded materials. Here we present a liquid crystal (LC) material that satisfies all of the above-mentioned requisites for the light-melt adhesives, namely, (i) a shear strength over 1 MPa up to 110 °C for bonding glass plates, (ii) an 85% reduction of the strength by ultraviolet (UV) irradiation, and (iii) an instant photomelting of the LC film in a few seconds. Moreover, this material is reusable as an adhesive, and the transformation between the LC and melted phases is associated with an informative color change in fluorescence. We envision that composite materials with the light-melt function will further improve the performance in manufacturing processes, which will accelerate the on-demand photoseparation technology complementary to the other switchable adhesion approaches.
Shohei Saito, "Light-melt adhesive based on a columnar liquid crystal (Conference Presentation)," Proc. SPIE 10361, Liquid Crystals XXI, 103610N (Presented at SPIE Organic Photonics + Electronics: August 07, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2274003.5581127961001.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.