ITC 3692 Quality Evaluation for fashion and Textile (2012/2013)
Topic:

Detection of Oxycellulose

1.Preparation of Damaged Cotton Fabrics

2. Analysis of Cotton fabric damage by –
(a) Fluidity Test
(b) Methylene Blue Solution
(c) Fehling’s Solution

Student:
Chan Wai Kwong 12125421D
Chee Ka Po 12126533D
Choi Wai Yuen 12041973D

Detection of Oxycellulose

Introduction & Theory
Oxidizing agent has a destructive action on cotton, unless their application is carefully controlled.
Cellulose is oxidized in various ways, all of which lead to the eventual destruction of its fibrous properties, the resulting product being termed oxycellulose.

There are 2 types of oxycellulose, namely acidic type and reducing type.
The alkaline solutions of Sodium Hypochlorite yield a product with acidic properties but low reducing power and the converse is the case when oxidation is carried out under acidic conditions.
Acidic oxycellulose has affinity for basic dye such as Methylene blue. The reducing type can convert the copper ion in Fehling’s solution from Cupric to Cuprous state.

In this experiment, you will expose cotton cloth to bleach liquor under 4 conditions: 1) without in contact with air 2) in contact with air 3) at room temperature 4) at elevated temperature
The bleach liquor is strong enough to overbleach the cloth very much, so you may observe the damage and the properties of such overbleached cotton.
You will study methods for detecting its presence with Fehling’s solution

Detection of Oxycellulose by Fehling’s solution

Apparatus and Reagent * 3 Cotton Cloth in even weight
(A) Undamaged Cotton fabric
(B) 20℃ Bleached Cotton fabric
(C) 50℃ Bleached Cotton fabric * Water Cylinders * Glass bottles * Test tubes * Bunsen burner * Fehling’s solution * Deionised water * Acetic acid * Heat Oven

Testing Procedure

1. Put