Effect of crystalline structure on the infrared spectra of γ-irradiated cotton cellulose

The effect of crystalline modifications on the infrared spectra of γ-irradiated cotton cellulose is presented. The crystalline modifications were brought about by treating cotton material with an aqueous solution of NaOH of various concentrations. The infrared spectra of the irradiated samples indicate an absorption band corresponding to the absorption of C?O groups. It was found that the intensity and frequency of this band depend on the crystalline structure. Thus, it appears at 1735 cm^?1 in the spectrum of cellulose I and at 1610 cm^?1 in the spectrum of cellulose II.     

The assessment of orthogonal tool angles as affected by the accuracy of edge positioning — A new nomographical approach

An analysis of the effect of the accuracy of edge positioning on the variation of orthogonal cutting tool angles has been carried out. Nomograms showing the interrelations of these variables have been constructed.     

Effect of the fine structure and electrolytic contaminations on the specific conductance of some cellulosic materials

From dielecric loss measurements the specific conductance of some cellulosic materials of different fine structure free of and constaminated with electrolytic impurities in the temparature range of 283.15–333.15 K was determined. Also the activation energy of conductance for the different samples examined was calculated. Based on the data obtained and the discussion given, it is now possible to view the conductivity of the complex structure cellulosic substances in a much clearer light.     

HYDRODESULFURIZATION OF QAIYARAH 80-205°C NAPHTHA FRACTION OF ALUMINA SUPPORTED Co-Mo-OXIDES ( PART 2) USING STOPPED FLOW GAS CHROMATOGRAPHY

Effective desulfurization of Qaiyarah 80-205°C, naphtha fraction resulted on alumina supported Co-Mo oxides, assembled in a GC column using H₂ as a carrier gas and the stopped-flow technique. Over 90% of 3ulfur vas removed from this partially cracked naphtha and a similar result (Ca 90%) was obtained when hydrodesulfurizing an acid-base treated naphtha.

1_H nmr studies on the chromatographically separated hydrodesulfurized fractions revealed interesting structural parameters leading to suggestions related to the occurrence of a reforming reaction and the liberation of fresh H₂ gases which further promotes hydrodesulfurization.     

Metal chelates with some cellulose derivatives. Part III. Synthesis and structural chemistry of nickel (II) and copper (II) complexes with carboxymethyl cellulose

Cu(II) and Ni(II) complexes with three grades of carboxymethyl cellulose (CMC) with different degrees of substitution have been synthesized and characterized. Probable structures of the metal complexes are inferred from the electronic and IR spectra, elemental analysis data and magnetic moment measurements. CMC coordinates with cu(II) and Ni(II) via the carboxymethyl and hydroxyl groups. The effect of the degree of substition of the CMC on the mode of chelation is discussed. Ni(II) complexes show an octahedral geometry around the metal ion and exhibit the formula [NiL · 4H₂O]Cl. Cu(II) complexes exist in the square planar form and have the formula Cu(L)₂, where L is uninegatively charged bidentate CMC ligand. The ligand field parameters of Ni(II) complexes are also evaluated.