Results 181 to 190 of about 7,548 (224)

Graft copolymerization of methyl methacrylate on holocellulose

Journal of Applied Polymer Science, 1987
AbstractGraft copolymerization of methyl methacrylate initiated by ceric ion in aqueous medium on bleached holocellulose was studied at 29°C. It was found that an increase in the concentration of ceric ion and oxidation of the holocellulose with aqueous potassium dichromate solution resulted in increased levels of incorporation of poly(methyl ...
E. F. Okieimen, K. I. Idehen, H. Ahiedu
openaire   +1 more source

Graft Copolymerization of Acrylonitrile on Bleached Holocellulose

Journal of Macromolecular Science: Part A - Chemistry, 1988
Abstract The mechanism by which ceric ions interact with cellulosic materials in the presence of vinyl monomers to initiate graft copolymer formation is generally believed to involve propagation by radicals generated on the cellulosic substrate [1–5]. However, the relatively high levels of homopolymerization and low efficiencies of grafting associated ...
F. E. Okieimen, K. I. Idehen
openaire   +1 more source

Studies on the holocellulose of Sitka spruce : methylation of spruce holocellulose

2012
Sitka Spruce holocellulose has been prepared by the chlorite procedure as modified by Wise and associates. This material has been subjected to successive methylations. The methoxyl content and yield of the solid residue were determined after each methylation and the methoxyl contents have been compared with corresponding values obtained when extractive-
openaire   +1 more source

Studies on the alkali extract from beech holocellulose

Wood Science and Technology, 1976
The alkali extract (5% KOH) from beech holocellulose was fractionated by ion exchange chromatography, resulting in several fractions containing different amounts of polyoses and lignin. The separated polyoses varied to some extent in the ratios of their sugar components.
Dietrich Fengel, Margarete Przyklenk
openaire   +1 more source

Grafting acrylonitrile and methyl methacrylate on holocellulosic materials

European Polymer Journal, 1987
Abstract Graft copolymers of acrylonitrile and methyl methacrylate on bleached holocellulose and thiolated holocellulose were obtained by the use of ceric ions in aqueous medium at 29°C. The level and efficiency of grafting on the bleached holocellulose were significantly higher than on the thiolated holocellulse, but the molecular weights and number
E.F. Okieimen, K.I. Idehen
openaire   +1 more source

Virus adsorbent systems based on Amazon holocellulose and nanomaterials

Microscopy Research and Technique
AbstractThe environment preservation has been an important motivation to find alternative, functional, and biodegradable materials to replace polluting petrochemicals. The production of nonbiodegradable face masks increased the concentration of microplastics in the environment, highlighting the need for sustainable alternatives, such as the use of ...
Adriano de Souza Carolino, Xaiane Martins Silva Freitas, Célio Matias Airone Macalia, Juliana Coatrini Soares, Andrey Coatrini Soares, Camila da Costa Pinto, Aguyda Rayany Cavalcante Barbosa, Jaqueline de Araújo Bezerra, Pedro Henrique Campelo, Marcos Marques da Silva Paula, Pritesh Jaychand Lalwani, Natalia Mayumi Inada, Ștefan Țãlu, Adriana Malheiro, Edgar Aparecido Sanches   +14 more
openaire   +2 more sources

Sugarcane bagasse derived carboxymethyl holocellulose

2022
This invention reports the development of a natural and sustainable cosmetic emulsifier based on by-products. We purpose a new emulsifier based on the holocellulose molecule and not cellulose and the carboxymethylation of holocellulose to produce a new cosmetic ingredient that acts as a O/w emulsifier, thickener, and jellifying agent.
Pedrosa, Sílvia, Madureira, Ana Raquel, Pintado, Manuela E., Pereira, Carla F., Ramos, Oscar Leandro   +4 more
openaire  

Pyrolysis mechanism of holocellulose-based monosaccharides: The formation of hydroxyacetaldehyde

Journal of Analytical and Applied Pyrolysis, 2016
Abstract Fast pyrolysis of biomass will produce complex pyrolytic products. Hydroxyacetaldehyde (HAA) is one of the most important pyrolytic products, derived from fragmentation (ring scission) of holocellulose. In this study, density functional theory (DFT) calculations are employed to reveal the HAA formation mechanisms from fast pyrolysis of four ...
Qiang Lu, Hui-yun Tian, Bin Hu, Xiao-yan Jiang, Chang-qing Dong, Yong-ping Yang   +5 more
openaire   +1 more source

Carboxymethylation of Corncob Holocellulose and Its Influences on Paper Properties

Journal of Wood Chemistry and Technology, 2014
Corncob is an underutilized agricultural by-product. In this work, corncob was treated with sodium chlorite to remove lignin, and the resulting holocellulose was optionally modified with sodium chloroacetate under alkaline conditions for different time periods to obtain five carboxymethylated corncob holocellulose samples.
Weitao He, Tiantian Yang, Yibin Wang, Xianliang Song   +3 more
openaire   +1 more source

A Simple Conversion of Holocellulose Fibers into a Potential Bioplastic

ChemistrySelect
Abstract Lignin is one of the major obstacles to conferring thermoplastic properties on lignocellulosic material. The trifluoroacetic anhydride (TFAA) esterification method is applied to previously delignified banana and flax fibers.
Prabu Satria Sejati, Lilou Triboul, Firmin Obounou Akong, Frédéric Fradet, Philippe Gérardin   +4 more
openaire   +1 more source