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dc.contributor.authorVaswani, Sudeepen_US
dc.date.accessioned2006-06-09T18:28:05Z
dc.date.available2006-06-09T18:28:05Z
dc.date.issued2005-01-18en_US
dc.identifier.urihttp://hdl.handle.net/1853/10582
dc.description.abstractPaper and cellulosic materials hold a good promise of being candidates for flexible packaging materials provided suitable barrier properties such as water repellence and grease resistance are imparted to them. One of the methods to achieve these objectives is to surface modify paper/cellulose by applying thin fluorocarbon coatings on the surface. Fluorocarbon thin films produced by plasma enhanced chemical vapor deposition (PECVD) offer several advantages over the films produced by conventional polymerization means. Plasma deposited films are pinhole-free, chemically inert, insoluble, mechanically tough, thermally stable and highly coherent and adherent to variety of substrates. In this work, we investigate the use of PECVD technique to produce barrier films on paper and cellulosic materials. These films, with composition and properties not much different from PTFE, repel water and act as a good barrier to lipophilic materials. Two different monomers, pentafluoroethane (PFE; CF3CHF2) and octafluorocyclobutane (OFCB; C4F8), were investigated and compared in terms of deposition rates and final film properties. Various analytical techniques (XPS, FT-IR, SEM, Ellipsometry, Contact Angle Goniometry, etc.) were used to characterize the fluorocarbon films. The fluorocarbon coated paper exhibited hydrophobic character as evidenced by high water contact angles. Although the films allow water vapor diffusion, the films are hydrophobic and are not wetted when liquid water contacts these layers. Based on various thickness of these films deposited on surface of cellulose, there was a minimum PFE film thickness required to achieve a stable hydrophobic behavior. The fluorocarbon films investigated in this work also exhibited good resistance to lipophilic materials (e.g. oils, fatty acids, etc.). While techniques such as oleic acid penetration and TAPPI "oil-kit" test are commonly used in paper industry to qualitatively test the grease barrier properties of paper/cellulose, this work attempts to quantify the grease barrier properties of fluorocarbon coated paper using techniques such as magnetic resonance imaging (MRI) and quartz crystal microbalance (QCM). Finally, the feasibility of deposition of dual layer films by PECVD was investigated using PFE and n-isopropylacrylamide (NIPAAM) as precursors for applications in barrier packaging and printing.en_US
dc.format.extent9506823 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectLipophobic or Grease Barrieren_US
dc.subjectWater vapor diffusivity
dc.subjectBarrier films
dc.subjectHydrophobic
dc.subjectSurface modification
dc.subjectPlasma deposition
dc.subjectFluorocarbon films
dc.subjectWater barrier
dc.subject.lcshPlasma chemistryen_US
dc.subject.lcshDiffusionen_US
dc.subject.lcshPackaging Materialsen_US
dc.titleSurface modification of paper and cellulose using plasma enhanced chemical vapor deposition employing fluorocarbon precursorsen_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentChemical Engineeringen_US
dc.description.advisorCommittee Chair: Hess, Dennis; Committee Member: Bidstrup Allen, Sue Ann; Committee Member: Henderson, Clifford; Committee Member: Ludovice, Peter; Committee Member: Patterson, Timothyen_US


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