NOPR Collection:

Morphology of Jute Fibre at Different Stages of Plant Growth

2016-07-20T06:13:17Z

Title: Morphology of Jute Fibre at Different Stages of Plant Growth Authors: Das, B K; Ray, P K; Chakravarty, A C Abstract: Fibre dimensions like length, breadth, lumen size and thickness of the cell wall were studied for jute at different stages of growth of the plant. The breadth and cell wall thickness increase up to a certain stage and then become almost constant, but the length of the ultimate fibres shows a downward trend after a certain stage. The steadiness in lignifications and the absence of turgor pressure at a later stage might account for the shrinking of the ultimate fibres in the macerated state. Page(s): 46-48

DTA and IR Studies on Cellulose-POCl₃-Pyridine Systems*

2016-07-20T06:12:32Z

Title: DTA and IR Studies on Cellulose-POCl₃-Pyridine Systems* Authors: Gupta, Jagdish Chandra; Bhatnagar, Satish; Lal, Krishan; Bhatnagar, Hari L Abstract: Phosphorylation and chlorination of cellulose with phosphoryl chloride in pyridine solvent were carried out in the temperature range 40-100°C for 24 hr and the thermal properties of the treated cellulose were evaluated by the DTA technique. The DTA curves of the products formed showed a single exothermic peak at 200°C, which can be attributed to the formation of a new bond. The thermograms of the treated cellulose had more sharp and well defined peaks in nitrogen atmosphere than in air atmosphere. Infrared spectra of some residues obtained by partially or completely charring some selected samples near the DTA peak temperatures gave indication of dehydration and skeletal rearrangement, as the absorption due to the hydroxyl stretching around 3400 cm^-1 and aliphatic C-H stretching at 2900 cm^-1 decreased. Page(s): 43-45

DTA and IR Studies on Cellulose Treated with a Formulation Based on Phosphorus, Nitrogen and Sulphur Synergism

2016-07-20T06:11:35Z

Title: DTA and IR Studies on Cellulose Treated with a Formulation Based on Phosphorus, Nitrogen and Sulphur Synergism Authors: Gupta, Jagdish Chandra; Bhatnagar, Satish; Lal, Krishan; Bhatnagar, Hari L Abstract: DTA studies were made on cellulose treated with THPC and thiourea in the presence of trace amounts of ammonium dihydrogen orthophosphate as a function of hydrogen ion concentration in air and nitrogen atmospheres. The thermo grams showed differences in the decomposition temperatures, depending upon the pH of the formulations. The thermograms of the treated cellulose had sharp and well defined peaks in air atmosphere, whereas in nitrogen atmosphere, double peak patterns were observed. Infrared spectra of some selected samples, which had been partially or completely charred near the peak temperatures, gave an indication of dehydration and skeletal rearrangement of the thioamide linkage in the adduct. Page(s): 40-42

Crystallinity of Polyethylene Terephthalate Fibres

2016-07-20T06:10:36Z

Title: Crystallinity of Polyethylene Terephthalate Fibres Authors: Gupta, V B; Kumar, Satish; Patil, N B; Chidambareswaran, P K Abstract: Six techniques for determining the Crystallinity of polyethylene Terephthalate fibres, five based on X-ray diffraction and one on density measurement, are evaluated on the basis of data obtained for a large number of samples. The advantages and shortcomings of various methods are discussed and it is concluded that for accurate work it would be advisable to compute Crystallinity by more than one method to ensure that the results do not show undue variations. Page(s): 35-39

NOPR Collection:

Morphology of Jute Fibre at Different Stages of Plant Growth

DTA and IR Studies on Cellulose-POCl3-Pyridine Systems*

DTA and IR Studies on Cellulose Treated with a Formulation Based on Phosphorus, Nitrogen and Sulphur Synergism

Crystallinity of Polyethylene Terephthalate Fibres

DTA and IR Studies on Cellulose-POCl₃-Pyridine Systems*