Now showing items 1-10 of 10
ADVANCES IN THE UNDERSTANDING OF THE DISSOLUTION MECHANISM OF CELLULOSE IN DMAc/LiCl
(Sociedad Chilena de Química, 2003)
Agregação de cadeias de acetatos de celulose em LiCl/DMAc: avaliação via viscosimetria
(Associação Brasileira de Polímeros, 2011)
Celulose de linter foi acetilada, visando obter acetatos de celulose com diferentes Graus de Substituição (GS) em meio homogêneo, usando cloreto de lítio/N,N-dimetilacetamida (LiCl/DMAc) como sistema de solvente, e anidrido ...
Some aspects of acetylation of untreated and mercerized sisal cellulose
(Sociedade Brasileira de Química, 2010)
We report here on some aspects of the acetylation in LiCl/N,N-dimethylacetamide, DMAc, of untreated and mercerized sisal cellulose, hereafter designated as sisal and M-sisal, respectively. Fiber mercerization by NaOH ...
Acetylation of cellulose in LiCl-N,N-dimethylacetamide: first report on the correlation between the reaction efficiency and the aggregation number of dissolved cellulose
The acylation of three cellulose samples by acetic anhydride, Ac(2)O, in the solvent system LiCl/N,N-dimethylacetamide, DMAc (4 h, 110 A degrees C), has been revisited in order to investigate the dependence of the reaction ...
Estudio de disolución de pulpa mecánica en la mexcla dimetilacetamida/cloruro de litio (DMAc/LiCl)
(Sociedad Chilena de Química, 1994)
Se estudiaron dos procedimientos para la disolución de la pulpa mecánica (PM). Un método en caliente permitió disolver la pulpa en un 63,5% y un método en frío o de intercambio de solvente que solo permitió disolver un 10,1%.
First report on the kinetics of the uncatalyzed esterification of cellulose under homogeneous reaction conditions: a rationale for the effect of carboxylic acid anhydride chain-length on the degree of biopolymer substitution
The kinetics of the homogeneous acylation of microcrystalline cellulose, MCC, with carboxylic acid anhydrides with different acyl chain-length (Nc; ethanoic to hexanoic) in LiCl/N,N-dimethylacetamide have been studied by ...
A physical organic chemistry approach to dissolution of cellulose: effects of cellulose mercerization on its properties and on the kinetics of its decrystallization
(ARKAT USA INC, 2011)
The effects of alkali treatment on the structural characteristics of cotton linters and sisal cellulose samples have been studied. Mercerization results in a decrease in the indices of crystallinity and the degrees of ...
Study of procedure for the obtainment of methylcellulose from mechanic pulp in homogeneous media
(Universidad Nacional del Sur y Consejo de Investigaciones Científicas y Técnicas, 1996)
The etherification reaction of mechanic pulp (MP) with dimethylsulphate (DMS) in homogeneous media was studied using a 2 5-1 fractional factional experimental design. In according to this model the quantity of DMS/2 g ...