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Large Area, Highly Transparent, and Mechanically Stable Adhesive Films with Tunable Refractive Indices
Author(s) -
Wang Dan,
Zhang Jianfu,
He Yuanyuan,
Li Wenfei,
Li Shitao,
Fu Xiuhua,
Tian Ming,
Zhou Yang,
Yao Zhanhai
Publication year - 2018
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201700608
Subject(s) - adhesive , materials science , cationic polymerization , refractive index , scanning electron microscope , acrylic acid , layer (electronics) , composite material , polymer chemistry , optical microscope , chemical engineering , polymer , optoelectronics , copolymer , engineering
Optical bonding with both excellent mechanical and optical properties is highly desirable for many advanced optical device applications. This paper presents a facile method for fabricating large‐area, highly transparent, and mechanically stable adhesive films with a tunable refractive index (RI) by the layer‐by‐layer (LbL) assembly of cationic branched poly(ethylenimine) (PEI) and an anionic blend of poly(acrylic acid) (PAA) and poly(4‐styrenesulfonic acid) (PSS). Scanning electron microscopy and atomic force microscopy studies indicate that the resulting (PEI/PAA–PSS)* n adhesive films with n PEI/PAA–PSS deposition layers are smooth and homogeneous. A satisfactory bonding strength is demonstrated for both two‐sided and one‐sided bonding methods, which provide a bonding strength greater than 5.71 ± 0.71 MPa. A linearly tunable RI from 1.5410 to 1.5792 is achieved with a transparency greater than 94% in the visible region. Moreover, the preparation and debonding of adhesive films can be conducted in water, which is convenient and environmentally friendly.