H. Chatterjee

Bio: H. Chatterjee is an academic researcher. The author has contributed to research in topics: Cellulose & Viscosity. The author has an hindex of 3, co-authored 5 publications receiving 48 citations.

28—the acid nature of jute fibre

Abstract: (1947). 28—THE ACID NATURE OF JUTE FIBRE. Journal of the Textile Institute Transactions: Vol. 38, No. 9, pp. T318-T332.

Molecular Weight of α-Cellulose from Jute and Allied Long Fibers:

Abstract: Four methods commonly employed for the estimation of cellulose, with special reference to jute, have been critically studied by means of viscosity measurements (and hence molecular weight) of the α...

Molecular Weight of Jute Alpha-Cellulose

Abstract: MUCH work has been done on the determination of the molecular weight of cotton and wood celluloses. Staudinger and Feuerstein1 reported 1,920 as the degree of polymerization of jute cellulose (which corresponds to a molecular weight of 311,040). But Chowdhury and Bardhan2 obtained 516; their value was calculated from Staudinger's equation: where ηsp is the specific viscosity, C the concentration, Km a constant and M the molecular weight. Km was taken to be 10 × 10−4. Since Km is now accepted as 5 × 10−4, their figure has to be doubled (that is, the degree of polymerization becomes 1,032).

Absorption of Basic Dyes by Jute

Abstract: IT is well known that jute fibre has a strong natural affinity for basic dyes. This was formerly ascribed to the presence of tannins in the fibre1. Analysis of a fairly large number of jute samples of different qualities in this Laboratory has shown that though the plant contains some tannin, the retted fibre is practically free from it. According to Chowdhury and Mitra2, acid constituents of the fibre, such as uronic acids, are responsible for this affinity. Some attribute it to the presence of lignin in the fibre. According to Parsons8, for example, “delignified jute no longer has this property”. The same statement also occurs in the latest edition of Whit taker's book4. Correct information in this regard is very important from the industrial point of view, for basic dyes are extensively used in dyeing jute, and if lignin be really the cause of absorption, fully bleached jute would not take up the dye unless mordanted.

Characterization of alkali-treated jute fibers for physical and mechanical properties

Abstract: Changes occurring in jute fibers when treated with a 5% concentration of a NaOH solution for 0, 2, 4, 6, and 8 h were characterized by weight loss, linear density, tenacity, modulus, FTIR, and X-ray measurements. A 9.63% weight loss was measured during 2 h of treatment with a drop of hemicellulose content from 22 to 12.90%. The linear density value showed no change until 2 h of treatment followed by a decrease from 33.0 to 14.5 denier by 56% after 6 h of treatment. The tenacity and modulus of the fibers improved by 45 and 79%, respectively, and the percent breaking strain was reduced by 23% after 8 h of treatment. X-ray diffractograms showed increase in crystallinity of the fibers only after 6 h of treatment, while FTIR measurements showed much of the changes occurring by 2 h of treatment with an increased amount of OH groups. By measuring the rate of change of the modulus, tenacity, and percent breaking strain with the time of treatment, a clear transition was apparent at 4 h of treatment with the dissolution of hemicellulose, causing a weight loss and drop in the linear density before and development of crystallinity with an improvement in the properties after the transition time. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1013–1020, 2001

Bibliography Resource structure properties of natural cellulosic fibres — an annotated bibliography

Abstract: We present a review of the work on the structure and properties of some natural lignocellulosic fibres with a classified list of references on resource, structure, physico-mechanical properties and on the uses of these fibres. This list of references includes papers published in scientific journals and in the proceedings of conferences.

4—the hemicelluloses of jute fibre

Abstract: (1948) 4—THE HEMICELLULOSES OF JUTE FIBRE Journal of the Textile Institute Transactions: Vol 39, No 2, pp T44-T58

Alkali-sensitive glycosides.

Abstract: Publisher Summary This chapter provides an overview of alkali-sensitive glycosides. It presents a classification of alkali-sensitive glycosides, which may be classified into three types: (1) glycosides of phenols, (2) glycosides of enols, and (3) glycosides of alcohols substituted in the β -position by a negative group. Reducing oligosaccharides are generally stable to alkali under the mildest conditions that decompose the glycosides. The ease of degradation is apparently related to the position of the glycosidic linkage at the terminal reducing unit. The general property of acid-sensitivity of the glycosidic linkage is attributable to the sugar portion, although this property may be influenced considerably by the nature of the aglycon. The property of alkali-sensitivity is a function of the aglycon, and is only slightly affected by the sugar residue. The chapter reviews the nature of the degradative reaction of glycosides of phenols. The reaction and proposed mechanisms of alkaline degradation of oligosaccharides are reviewed in detail.