Degradation Method

Degradation Method

Thermo-oxidative Degradation

The thermo-oxidative degradation of undyed, bleached dyed and modified okra bast fibres were studied. Okra bast fibres were cut into equal length of 30 cm and placed in an electric oven in presence of air. After heating the experimental samples at 50, 100, 150, 200 and 250°C for 1 h, the fibre samples were collected. The change in colour of samples were assessed with Grey Scale.

Photo-Oxidative Degradation

Both undyed and bleached dyed and modified okra bast fibres were attached on a flat board separately and placed on the roof of a building for exposure in open air under the sun for 50, 100, 150, 200 and 250 hours without any protection from weather. Care was taken so that the effect of weathering would be confined to the surface of the fibre. After exposing the fibres were collected from the board for experimental purpose. The change in colour of samples was assessed with Grey Scale.