Facile fabrication of a polyvinyl alcohol-based hydrophobic fluorescent film via the Hantzsch reaction for broadband UV protection

Abstract

Excessive exposure to ultraviolet (UV) light is harmful to human health. However, the traditional preparation of anti-UV films through doping UV absorbers is unstable. Chemical modification of polyvinyl alcohol (PVA)...

State-of-the-art luminescent materials based on wood veneer with superior strength, transparency, and water resistance

“…The compression and drying processes enhanced the hydrogen bonding interlocking and bonding between adjacent fibrils and formed coherent materials with uniform refractive index. By contrast to previously reported systems that rely solely on simple hydrogen bonding [31], the grafted DHP fluorescent groups helped to further cross-link cellulose molecular layers. As shown in Fig.…”

Photochemically driven one-step triple dynamic network formation in printable tough hydrogel for self-healing tubular sensors

“…Acetoacetate-modified PVA (PVAA), 2-amino-4-hydroxy-6-methylpyrimidine (UPy), 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4[1H]-pyrimidinone(UPy-NCO), and Gel-UPy were synthesized according to the reported methods, respectively. 38,60 Synthesis of t-BAA dimer t-BAA (0.316 M), Ru(II) (0.316 mM), and APS (0.316 M) were dissolved in 5 mL of DMSO. After being exposed to blue light at predetermined times, the products were purified by multiple hexane extractions and then dried in a vacuum for 6 h.…”

“…Acetoacetate-modified PVA (PVAA), 2-amino-4-hydroxy-6-methylpyrimidine (UPy), 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4[1 H ]-pyrimidinone(UPy-NCO), and Gel-UPy were synthesized according to the reported methods, respectively. 38,60…”

Strong and tough octyl enamine-grafted polyvinyl alcohol with programmable shape deformationviasimple soaking treatment

“…Acetoacetylated polyvinyl alcohol (AAPVA) synthesized by grafting polyvinyl alcohol (PVA) with acetoacetyl groups has been widely used in textile, construction, medicine, electronics and other industries due to its versatile reactivity. 16 The acetoacetyl groups are able to react with amines to form enamine bonds at room temperature in the absence of catalysts. [16][17][18][19][20][21] Therefore, the introduction of acetoacetyl groups makes AAPVA highly reactive, 22 and upon further reaction different functions can be introduced to AAPVA by the treatment of various functional amines, which would broaden the applications of AAPVA.…”

“…16 The acetoacetyl groups are able to react with amines to form enamine bonds at room temperature in the absence of catalysts. [16][17][18][19][20][21] Therefore, the introduction of acetoacetyl groups makes AAPVA highly reactive, 22 and upon further reaction different functions can be introduced to AAPVA by the treatment of various functional amines, which would broaden the applications of AAPVA. 16 The solution blending strategy (such as a one-pot method) adopted in the preparation of traditional polymeric materials usually creates a homogeneous structure, once the chemical composition sets, which then becomes difficult to improve the mechanical properties and functions of the polymers.…”