induced crystallization of cellulose in never-dried cotton fibers

in the present investigation, we have made a systematic study of the induced crystallization in never-dried cotton fiber, by allowing it to desiccate under different conditions of humidity and temperature. the resulting structural changes have been followed using x-ray diffraction and infrared absorption techniques. a slow rate of drying ..

chiral metals: amino acid-substituted conducting polypyrroles

chiral amino acid groups are substituted on the 3 position of pyrrole. these functionalized monomers are electropolymerized, the high conductivity obtained for the polymers confirming the existence of long conjugated chains. the circular dichroism spectra of these polypyrroles exhibit a large positive cotton effect, centred on the absorpt..

production of cocoa butter-like fat from interesterification of vegetable oils

cocoa butter-like fat was prepared from completely hydrogenated cottonseed and olive oils by enzymatic interesterification. the optimum reaction time to produce the major component of cocoa butter, 1(3)-palmitoyl-3(1)-stearoyl-2-monoolein (pos), was 4 hr. the cocoa butter-like fat was isolated from the reaction mixture by two filtration s..

pyridine-catalyzed depolymerization of cellulose during carbanilation with phenylisocyanate in dimethylsulfoxide

carbanilation reactions of cellulose samples (bleached cotton linters and avicel) with phenylisocyanate in dimethylsulfoxide (dmso) were carried out at 60 $degree$ c in the presence of various pyridine derivatives. the molecular weight distributions of the resulting cellulose tricarbanilates (ctcs) were measured by high-performance size e..

circular dichroism and exciton effect of syndiotactic methacrylic polymers with chiral diacyl hydrazide side chain. ii poly(methacrylic acid-n** $beta$ (l-( $plus$ )-lactoyl) hydrazide)

syndiotactic poly(methacrylic acid hydrazide) has been condensed with l-( $plus$ )-lactic acid to form optically active side chains which are connected to the main chain by diacyl hydrazide moieties. a model compound was prepared in the same way from pivalic acid hydrazide. the cd spectra of polymer and model compound have been recorded i..

particle measurements in army barracks

the aim for this study was to reduce particle number concentration caused by bedding and cleaning in army barracks sweeping has been a generally used cleaning method in barracks sweeping produces high particle concentration into air trough reemission of the sedimented material on floors. immediately after sweeping the floor is wiped with ..

phospholipids of six seed oils of malvaceae

the phospholipid fractions of six seed oils of the malvaceae family - gossypium barbadense (egyptian cotton), hibiscus cannabinus (kenaf), hibiscus sabdarifa (roselle), two varieties of hibiscus esculentus (okra) and althea rosea (ketmia, hollyhock or egyptian hemp) - have been isolated by silicic acid chromatography. thin-layer chromatog..

component triacylglycerols of six seed oils of malvaceae

the component triacylglycerols of six seed oils of the malvaceae family - gossypium barbadense (egyptian cotton), hibiscus cannabinus (kenaf), hibiscus sabdarifa (roselle), two varieties of hibiscus esculentas (okra) and althea rosea (ketmia, hollyhock or egyptian hemp) - have been determined by using the lipase hydrolysis technique. the ..

graft copolymerization of 4-vinylpyridine onto partially carboxymethylated cellulose. the degree of substitution effect

the graft copolymerization of 4-vinylpyridine (4-vp) onto partially carboxymethylated cotton (pcmc), having different carboxymethyl contents, was investigated. under similar reaction conditions, both the graft yield and ceric ion consumption increased by increasing the degree of substitution of carboxymethyl groups of pcmc up to a value o..

uplift along the salt lake segment of the wasatch fault from apatite and zircon fission track dating in the little cottonwood stock

apatite from granite samples out of the little cottonwood stock of north-central utah range in age from about 7 ma at 1500 m elevation to about 11 ma at 3500 m elevation and give an uplift rate of 0.68 mm yr** $minus$ **1 during this time period. zircons from some of the same samples range in age from about 9 ma at 1500 m elevation to 20 ..