دانلود رایگان مقاله اثر آرگون پلاسما مایکروویو بر روی سیستم اتصال گلیکوزیدی و هیدروژن سلولز پنبه

ABSTRACT

Cotton fabric was processed with microwave (Ar) plasma to alter its hydrophilicity. The process parameters namely microwave power, process gas pressure and processing time were optimized using Box-Behnken method available in the Design Expert software. It was observed that certain combinations of process parameters improved existing hydrophilicity while the other combinations decreased it. ATR-FTIR spectral analysis was used to identify the strain induced in inter chain, intra chain, and inter sheet hydrogen bond and glycosidic covalent bond due to plasma treatment. X-ray diffraction (XRD) studies was used to analyze the effect of plasma on unit cell parameters and degree of crystallinity. Fabric surface etching was identified using FESEM analysis. Thus, it can be concluded that the increase/decrease in the hydrophilicity of the plasma treated fabric was due to these structural and physical changes.

4. Conclusions

In this study, the Box–Behnken design constructed to optimize microwave Ar plasma treatment of cotton fabric recommended quadratic model for the input parameters and its response. It was found that the sample treated with minimum gas pressure for maximum exposure time showed hydrophilic nature, whereas the sample treated with maximum gas pressure for minimum power percentage showed hydrophobic nature. From the ATR-FTIR analysis is was found that there were no additional peaks pertaining to new functional groups. It was also found that a sizeable change in the intensities ofthe IRspectra, and the shiftinthe IR wavenumbers which lead to a strain in the inter, intra molecular and intersheet hydrogen bond and glycosidic linkage of the cellulose chain. XRD study indicated that there was a decrease and increase in the crystallinity of the sample showing hydrophilic and hydrophobic behavior respectively compared to the control sample. In agreement with the increased hydrophilic and reduced hydrophilic nature, the FESEM images show the etching and smoothing of the cellulose fiber compared to the control sample. Hence it can be concluded that using a single plasma treatment dual property can be imparted to cotton fabric just by varying the process parameters.