Design Strategies for Reduced‐scale Surface Composition Gradients via CVD Copolymerization1. Issue 1 (18th November 2013)

• Record Type: Journal Article
• Authors: Elkasabi, Yaseen; Ross, Aftin M.; Oh, Jonathan; Hoepfner, Michael P.; Fogler, H. Scott; Lahann, Joerg; Krebsbach, Paul H.
• Is Part Of: Chemical vapor deposition. Volume 20:Issue 1/3(2014:Mar.)
• Page Start: 23
• Page End: 31
• Publication Date: 2013-11-18
• Subjects: Coatings -- Gradients -- Polymers -- Surface engineering -- Transport modeling; Chemical vapor deposition -- Periodicals; 671.735
• DOI: 10.1002/cvde.201307057
• Languages: English
• ISSNs: 0948-1907

Abstract

Abstract : A new method for generating and modeling reduced‐scale copolymer gradients by CVD is reported. By exploiting diffusion through confined channels, functionalized [2.2]paracyclophanes are copolymerized into their poly( p ‐xylylene) (PPX) analogues as a composition gradient. Fourier transform infrared (FTIR) and X‐ray photoelectron spectroscopy (XPS) are used to verify the gradient composition profiles. Gradients are deposited on both flat substrates and 3‐dimensional cylinders. Both the thickness and compositional profiles are fitted to a diffusion‐based model using realistic physical parameters. The derived equation can be generalized and optimized for any copolymerization gradient through a confined geometry, thus allowing for broad applicability to other copolymer systems. Abstract : A method for depositing reduced‐scale polymer surface composition gradients is described. The method applies to both flat and three‐dimensional substrates. A transport model fits the experimental measurements to physical parameters, enabling the calculation of gradient properties.