Study on Stability and Stability Mechanism of Styrene-Acrylic Emulsion Prepared Using Nanocellulose Modified with Long-Chain Fatty Acids

et al. 2021

Polymers

Self Cite

Different modification process routes are used to improve the modified cellulose nanocrystalline (MCNC) with higher fatty acid by esterification reaction and graft polymerization to obtain certain hydrophobic properties. Two preparation methods, product structure and surface activity, are compared and explored. Experimental results show that the modified product is still at the nanometer level and basically retains the crystal structure of the raw cellulose nanocrystalline (CNC). The energy consumption of the two preparation methods is low; however, the esterification method with co-reactant requires short reaction time, and the degree of substitution of the product is high. The modified product prepared by grafting polymerization method has a high HLB value and amphiphilicity, which can effectively reduce the surface tension of water. Therefore, it can be used as a green and environmentally friendly surface-active substance.

Section: Prefacementioning

confidence: 99%

Comparative Study on Different Modified Preparation Methods of Cellulose Nanocrystalline

et al. 2021

Polymers

Self Cite

“…There was also a broad, weak peak at 42.3°. However, the curves had no characteristic CQD peaks, and the crystal structure of the CQDs was not retained in the coating films [ 27 ]. The XRD images of the CQD/SAE coating films were similar to each other, which illustrates that the crystal structure of the coating films was almost unchanged, and afterward, the addition of the CQDs only affected the peak intensity of the crystal structure of the styrene acrylic emulsion.…”

Section: Resultsmentioning

confidence: 99%

Fluorescent CQD-Doped Styrene Acrylic Emulsion Coating Film with Enhanced Optical Properties

Yang

et al. 2021

IJMS

Styrene acrylic emulsions (SAEs) have emerged as a promising material for water-based coatings. However, they are still limited by their own defects in practical applications, poor weatherability, and degradation of performance at lower or higher temperatures. Here, we introduce a facile approach to producing fluorescent carbon quantum dots (CQDs) from wood processing residues and fabricating fluorescent CQD/SAE coating films via emulsion-casting. The addition of the fluorescent CQDs enhanced the optical performance of the CQD/SAE coating films. The fluorescent CQDs were prepared via a hydrothermal approach and were obtained after heating at 180 °C for 6 h at a reaction concentration of 50 mg/mL. The synthesized CQDs resulted in a high fluorescence, and the CQDs had an average size of 1.63 nm. Various concentrations of the fluorescent CQDs were doped into the SAE coating film, which improved its optical properties. We also characterized and discussed the products and then explored their optical properties. This study presents the potential of fluorescent CQD/SAE coating films for applications in anti-counterfeiting coatings, fluorescent adhesives, and papermaking.

“…Free-radical polymerization is a simple polymer grafting method. For example, cerium ammonium nitrate (CAN), potassium persulfate, and Fenton's reagent can initiate polysaccharide graft copolymerization (Yang, et al, 2021;Zhang, Yang, Lu, Lang, & Gao, 2019a). Littunen, et al (2011) used CAN to graft several acrylics and methacrylic monomers on…”

Section: Chemical Modificationsmentioning

confidence: 99%

Nanocelluloses review: Preparation, biological properties, safety, and applications in the food field

et al. 2023

Food Frontiers

Functional diet and food safety requirements, as well as reducing the consumption of nonrenewable resources and environmental pollution are the important development themes on food processing. The development and application of edible nanocelluloses (NCs) is an urgent need in the current food field. NCs are divided into three types, including cellulose nanofibrils, and cellulose nanocrystals from natural fibers, as well as bacterial cellulose synthesized by bacteria. In this review, recent developments in surface modification, biological properties, safety issues, and their applications in the food industry were highlighted. NCs have application limits due to native hydrophilicity, surface modification strengthens their hydrophobicity and stability in the oil phase. NCs exhibit excellent physicochemical properties and successfully be used as edible coatings, emulsion stabilizers, and functional food ingredients. In particular, NCs and modified NCs can be used as low‐calorie fat substitutes and prebiotics for improving gut microbiota. However, the biological properties and safety assessments still require more attention, as well as establishing the regulations for food applications.