NOPR Collection:

Study of Surface Characteristics of Hemp Fibres Using Scanning Electron Microscopy

Sat, 01 Sep 1979 00:00:00 GMT

Title: Study of Surface Characteristics of Hemp Fibres Using Scanning Electron Microscopy Authors: Rahman, M M M; Sayed-Esfahani, M H Abstract: The main surface characteristics of hemp fibres subjected to different chemical treatments have been elucidated using scanning electron microscopy. The surface characteristics are improved and progressive cottonization is possible with depectinization treatments. Industrial cottonization is chemically feasible with subsequent delignification. Page(s): 115-120

Variation Flow Analysis in the Preparation of Jute Yarn

Sat, 01 Sep 1979 00:00:00 GMT

Title: Variation Flow Analysis in the Preparation of Jute Yarn Authors: Lahiri, A; Guha, P K Abstract: The variation flow analysis technique for determining the added irregularity at any stage of jute processing is described and results of experiments conducted recently at the pilot mill of the Indian Jute Industries' Research Association (IJIRA) and in a number of mills applying this technique are reported. Some studies on short-term irregularity are also reported from which the flow of short-term irregularity from the breaker card through third drawing stages has been established. Page(s): 111-114

A Comparative Study of the Swelling Action of Monoamines and Diamines on Cotton Cellulose

Sat, 01 Sep 1979 00:00:00 GMT

Title: A Comparative Study of the Swelling Action of Monoamines and Diamines on Cotton Cellulose Authors: Venkataraman, A; Subramanian, D R; Manjunath, B R; Padhye, M R Abstract: Cotton cellulose was subjected to single and multiple swelling treatments with anhydrous ethylamine and 99 % ethylenediamine. The effects of monoamine and diamine treatments on the fine structure of cellulose were found to be similar. The current theory of swelling action of amines on cotton cellulose has been modified. In the light of fresh evidence, the theory of the diamine molecules crosslinking the neighboring cellulosic chain is found to be untenable. Page(s): 106-110

Hydrolysis and Aminolysis of Polyethylene Terephthalate

Sat, 01 Sep 1979 00:00:00 GMT

Title: Hydrolysis and Aminolysis of Polyethylene Terephthalate Authors: Padhye, M R; Nadaf, A N Abstract: The effect of hydrolytic and aminolytic degradation on the structure of polyethylene Terephthalate (PET) films has been investigated. Changes in IR Crystallinity, number of OH and COOH end groups, and development of opacity have been taken as measures of the morphological changes occurring on hydrolysis. Increase in Crystallinity occurs on treatment with acids, alkalis and amines. End group analysis shows that chain scission takes place only under drastic conditions (high reagent concentration and high temperature of treatment). With all other reagents tried, except sulphuric acid, the film develops opacity, indicating that these reagents diffuse into the body of the film. In the case of hydrochloric acid, the attack seems to cause random depolymerization, while with sulphuric acid and alkalis, the end monomers seem to be liberated. Page(s): 99-105