Properties of Ultraviolet‐Shielding Composite Film Prepared from Cellulose Acetate with Eu(III) Complex

The ultraviolet shielding composite films were prepared from cellulose acetate (CA) modified by grafting rare earth complexes Eu(MAA) 3 phen‐APS (MMA: Methacrylic Acid, APS: (3‐Aminopropyl)trimethoxysilane). The composite films possessed high optical transmittance and exhibited excellent ultraviolet (UV) absorption property. It exhibited bright red emission centered at 615 nm under UV excitation. The thermal analysis showed that the stability of the composite film is similar to that of pure CA. However, the glass transition temperature gradually disappeared with the increasing amount of Eu(MAA) 3 phen‐APS (Eu(III)‐complex) owing to the crosslinking reaction. The morphology analysis showed that the Eu(III)‐complex microdomains dispersedly was filled in the matrix of CA and a good interfacial adhesion was achieved. The size of the Eu(III)‐complex formed in the CA matrix is the main factor to effect the transparency of composite films.