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Graphical abstract Highlights • Biodegradable surface sizing agent(poly-vinyl alcohol/itaconic acid/acrylamide)was synthesized via radical polymerization with MINITAB software'DOE. • PVA/IA/AM could form the hydrophobic coating layer with a spatial network structure on the surface of paper. • It not only improve the hydrophobicity of paper but also increase the paper surface strength. • The copolymer had better forming film characteristic and lower property of penetrating into the interior of paper than PVA. Abstract Biodegradable surface sizing agent(poly-vinyl alcohol/itaconic acid/acrylamide)was synthesized via radical polymerization with MINITAB software. Fourier transform infrared spectroscopy and scanning electron microscopy were used to evaluate the structure of the surface sizing agent. In the meantime, a thin layer of PVA or PVA/IA/AM was coated on the surface of paper. The strength and water resistance of paper were studied and compared. The optimization experiment condition for the surface sizing agent was determined by Design of Experiment (DOE). It indicated that PVA/IA/AM copolymer not only improve the hydrophobicity of paper but also increase the paper surface strength. It was attributed that PVA/IA/AM could form the hydrophobic coating layer with spatial network structure on the surface of paper and increase the number of hydrogen bonding between the copolymer and fiber. Furthermore, the copolymer had better forming film characteristic and lower property of penetrating into the interior of paper than PVA when they were coated on the surface of paper. [ABSTRACT FROM AUTHOR]

A multifunctional fluorescent polymer based on coumarin (MFPC) was synthesized using a four-step synthetic route. To obtain the target compound, 7-amino-4-methylcoumarin, coumarin fluorescent monomer (CFM), and ultraviolet absorber monomer (UVAM) were prepared. By the reaction of CFM, UVAM, trimethyl-2-methacroyloxyethylammonium chloride (DMC), and acrylamide (AM) as a linker, a new multifunctional fluorescent polymer was synthesized. The structure of the MFPC was characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H-NMR) spectroscopies. The optical properties of MFPC were measured by ultraviolet-visible (UV-vis) and fluorescence spectroscopies, in aqueous solution. The integration effect between MFPC and paper was tested by scanning electron microscopy. The application performance of MFPC on paper was evaluated by measuring the surface strength, smoothness, and whiteness using the printability tester and the UV accelerated aging test. Results indicated that the MFPC had good solubility in water. It also exhibited a positive effect on the light stability and surface strength of paper as a light stabilizer, fluorescent brightener, and surface sizing agent. [ABSTRACT FROM AUTHOR]