Development of Oleophobic Polymeric Surface induced by Ion beams

Abstract

The result suggested that the surface initiated free radical polymerization has newlinegiven rise to non-uniform molecular weight distribution and dense coverage of newlineMMA on PTFE surface. The bumps in the form of white patches appear in newlineFE-SEM image of grafted PTFE at 50°C. The height at this section of image is newlinenot similar to ungrafted surface. This white spot section in grafted image is newlinenearly one third of the total surface area clearly indicates the increase in newlineroughness of the surface. In similar fashion, deep dugs in the form of dark newlineblack spots also appear in images. Points represent duggy spots which are little newlinedark in colour showing non-uniform structure of surface and hence depict newlineincrease in surface roughness. The non-uniformity in image is reduced at newlinehigher temperatures showing reduction in percentage of white patches. This newlinewas because of grafting rate reduction at higher temperature change in newlinemorphology of surface. At 50and#8304;C maximum % of grafting i.e 9.77% was newlineachieved resulting in maximum change in surface morphology of PTFE newlinepolymer. The XRD analysis of grafted polymer at various temperatures newlineindicate maximum crystallographic changes at 50and#8304;C grafted temperature. newlineContact angle goniometry concludes that contact angle is a function of newlinepercentage grafting. The value of the contact angle increased from 40and#8304;C to newline50and#8304;C and its maximum value i.e 95.5and#8304;C exists when PTFE is grafted at 50and#8304;C. newline