Effect of Radiofrequency Plasma Assisted Grafting of Polypropylene on the Properties of Muga Silk Yarn
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Radiofrequency (RF) Ar/propylene glow discharge is utilized for grafting polypropylene onto muga silk yarn at working pressure of 1.2 × 10−1 mbar and in the of RF power range of 20–80 W. The plasma discharge is diagnosed using self-compensated emissive probe to study the variation of ion energy impinging on the substrates with RF power. From chemical compositional analysis, a possible grafting mechanism between propylene and muga yarn is proposed by considering the charge-transfer initiation through the formation of electron-donor–acceptor (EDA) complex. X-ray photoelectron spectroscopy reveals that at RF power values of 60–80 W, the ion sputtering effect becomes dominant over plasma grafting thereby leading to severe destruction in chemical structure of the polypropylene grafted (PP-grafted) muga yarns. The experimental results show that PP-grafted muga yarns exhibit improved mechanical strength and hydrophobic behavior as compared to the virgin yarn. The properties of the PP-grafted muga yarns are observed to be dependent on atomic concentration, surface morphology as well as the results obtained from plasma discharge characteristics.
KeywordsMuga silk yarn Surface modification Radiofrequency plasma assisted grafting Polypropylene Plasma diagnostics
The authors would like to thank the Board of Research in Nuclear Sciences, Department of Atomic Energy; Government of India for financial support.
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