Aramid‐Reinforced UV Curable Adhesive Resins for Use As an Interlayer in Laminated Glass

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-11, Vol.20 (45), p.e2404907-n/a
• Main Authors: Lee, Jineun, Lee, Hanna, Kwak, Giseop
• Format: Article
• Language: English
• Subjects: Acoustic insulation; Acrylamide; adhesive resin; Adhesive strength; Ambient temperature; aramid; Aramid fibers; Condensation polymerization; Condensation resins; Diamines; Glass; Glass transition temperature; Heat treatment; Impact resistance; Interlayers; laminated glass; Light transmittance; Modulus of elasticity; Monomers; Phase separation; Polymers; Resins; Safety glass; Tensile strength; Ultraviolet radiation; UV curing
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202404907

Colorless, transparent, and mechanically robust aramid polymers are synthesized from two diamine monomers with strong electron‐withdrawing groups, using low‐temperature solution condensation with diacid chloride. The aramids dissolved very well in the liquid acrylamide monomers. When N,N‐dimethylacrylamide (DMA) is used as a reactive diluent, films with the desired features are produced from the hybrid aramid‐DMA resins via ultraviolet (UV) curing. The hybrid films are colorless and transparent in the visible region and showed an increase in the glass transition temperature, tensile strength, and elastic modulus in proportion to the aramid content. Laminated glass is manufactured using the hybrid resin as an interlayer, which exhibits very strong adhesion between the two sheets of glass, is not easily broken by an external impact, and do not scatter fragments. Moreover, the laminated glass do not distort images and functioned very effectively in UV blocking, soundproofing, and suppressing changes in the ambient temperature. Heat treatment further improves the light transmittance and impact resistance of the laminated glass. Laminated glass specimens with various fluorescence colors are also manufactured. Aramid‐reinforced films prepared using N,N‐diethylacrylamide as a reactive diluent underwent thermally induced phase separation in a wet state, providing smart glass with a privacy protection function. UV‐curable adhesive resins reinforced with aramids in a highly dispersed state are developed. Laminated glasses using these as an interlayer shows excellent physical properties such as a high impact resistance, strong adhesion to the glass layers, visible transmission, UV blocking, and noise insulation. Laminated glasses with various fluorescence colors and privacy protection functions are also easily manufactured.