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Introduction
Among the man-made fibres, polyester fibre is widely used becauseof its certain desirable properties. However, dyeing of polyester fibres withdisperse dyes is a complex phenomenon and offers considerable difficulties indyeing due compact structure and absence of reactive sites. To reduce energycost, efficient processes such as pretreatment with solvents, have beenconceived as a potent route for producing atmospheric pressure
The structural modifications of polyester depend upon the extentof interaction between polyester and solvents, associated with their respectivesolubility parameters.
Literature survey shows that treatments with various solvents werecarried out at room temperature as well as at elevated temperature and time oftreatment is from 2 to 960 min. In these studies, conventional heatingtechniques were used for treatments at elevated temperature. However, to bestof our knowledge no information is available on the use of Microwaves for thesolvent pretreatment of polyester, although microwaves are used for the dyeingof polyester.
Therefore the present study was undertaken to investigate the useof microwave heating for solvent pretreatment. The idea behind using microwaveswas to reduce the pretreatment time since microwaves are known to give fast andrapid volume heating. This paper deals with the dyeability characteristics andstructural changes due to solvent pretreatment in microwave oven.
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