Range-Broadening Ultraviolet-Blocking Regulation of Cellulose Nanopaper via Surface Self-Absorption with Poly(methyl methacrylate)/Avobenzone

Cellulose nanopaper-based materials with recyclability and excellent optical properties have recently received increasing attention. A series of lignin-containing (17.2, 14.7, 7.3, 4.9, and 1.3% by wt) pristine nanopapers (LNPs) were obtained through self-absorption of poly(methyl methacrylate) (PMMA)/avobenzone (AVB) to produce cellulose nanopapers (LPANPs) with range-broadening and ultraviolet (UV) blocking extending from UVB (290-320 nm) to UVA (320-400 nm). SEM results indicated that PMMA/AVB presented a microspherical morphology (150-600 nm) on LPANP surfaces. LPANP exhibited high optical transparency (>95% in the visible region) and high haze (>77%), with good wet mechanical properties (107.5 MPa) and thermal stability. In addition, LPANP hydrophobic properties were significantly improved after PMMA/AVB particle absorption, achieving conversion from hydrophilicity to hydrophobicity. Consequently, with the properties of water resistance, optical haze, and range-broadening UV-blocking, these LPANP presented potential applications in the field of optoelectronic devices, such as in UV-blocking, supercapacitors, and electronic device substrates.