Abstract
Surface irradiation of mulberry silk fabric is carried out using a VUV excimer lamp. Change in surface chemistry is studied through carbonyl group estimation and surface morphological changes are analyzed in high resolution scanning electron microscope. Significant development in carbonyl groups is observed upon irradiation. Mechanism of carbonyl groups formation has been proposed. Further, VUV light penetration effect, with an irradiation power of 50 mW/cm2, in the irradiation atmosphere is studied through degree of modification at different points of the irradiated sample for various timings from 1 min to 30 min. Up to an irradiation time of 10 min, the rate of change is noticeable at all the points particularly just below the lamp boundary points i.e. between −20 mm to +20 mm (lamp ϕ: 40 mm, center of the lamp is considered to be 0). The fabric points lied outside the lamp boundaries (−40 mm to −20 mm and 20 mm to 40 mm) has undergone less intense surface modifications. This has been evidenced through carbonyl group analysis, wetting time measurements, and SEM results.
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