Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films》.pdfVIP

Applied Surface Science 337 (2015) 19–26 Contents lists available at ScienceDirect Applied Surface Science j o u r n a l h o m e p a g e: w w w. elsev /locate/aps usc Influence of SHI upon nanohole free volume and micro scale level surface modifications of polyethyleneterephthalate polymer films Rajesh Kumar ∗ , Paramjit Singh University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi-110078, India a r t i c l e i n f o a b s t r a c t Article history: Topographic micro scale and in-depth nano scale level modifications of polymeric materials play an Received 23 December 2014 important role in engineering their physical and chemical properties. Polyethylene terephthalate (PET) is Received in revised form 2 February 2015 an important class of semi-crystalline polymers used for gas separation properties. The gas diffusion and Accepted 5 February 2015 permeability parameters are directly related to the free volume fractions and the hole distributions. The Available online 13 February 2015 controlled and precise ion beam irradiation can be used to induce surface and in-depth modifications in the properties of the polymers which help in modifying free volume holes and their distributions. In the Keywords: present study, the investigation of free volume (nano scale level) and surface (micro scale level) properties Polyethylene terephthalate