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dc.contributor.authorLi, Yangyang
dc.contributor.authorRojas, O. J.
dc.contributor.authorHinestroza, J. P.
dc.date.accessioned2016-02-28T07:59:37Z
dc.date.available2016-02-28T07:59:37Z
dc.date.issued2012-02-10
dc.identifier.citationLi Y, Rojas OJ, Hinestroza JP (2012) Boundary Lubrication of PEO-PPO-PEO Triblock Copolymer Physisorbed on Polypropylene, Polyethylene, and Cellulose Surfaces. Ind Eng Chem Res 51: 2931–2940. Available: http://dx.doi.org/10.1021/ie202292r.
dc.identifier.issn0888-5885
dc.identifier.issn1520-5045
dc.identifier.doi10.1021/ie202292r
dc.identifier.urihttp://hdl.handle.net/10754/600232
dc.description.abstractIn situ lateral force microscopy (LFM) and X-ray photoelectron spectroscopy (XPS) were used to probe the lubrication behavior of an aqueous solution of poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) (PEO-PPO-PEO) symmetric triblock copolymer on thin films of polypropylene (PP), polyethylene (PE), and cellulose. LFM experiments were carried out while the substrates were immersed in water and in solutions of the copolymer. The friction coefficient on PP and PE was reduced after adsorption from the PEO-PPO-PEO aqueous solution while the opposite effect was observed for cellulose surfaces. A critical normal loading force, at which the friction coefficient of the lubricated and unlubricated surfaces is equal, was identified and related to the affinity of the polymer with the substrate. Further experiments were performed to mimic practical operations involving lubricant addition during manufacturing and postprocessing removal. XPS was used to verify the presence of the lubricant on the polymeric substrates and to evaluate its removal by water washing. The lubricant layer was easily removed by water from the PP and cellulose surfaces while a durable layer was found on PE. The XPS results were in agreement with the highest critical normal loading force measured for PE (52 nN for PE in contrast to a minimum of 10 nN for cellulose). While several reports exist on lubrication on hard surfaces, friction behavior on soft surfaces is still not well documented as the substrates usually deform under loading pressure. Therefore, we also propose a simple lubrication model for PP, PE, and cellulose and the use of critical normal loading force as a parameter to predict lubricity and durability of adsorbed nonionic block copolymers. © 2012 American Chemical Society.
dc.description.sponsorshipThis work was supported by the National Textile Center under Grant No. C05-NS09. Junlong Song is acknowledged for help in preparing the polymeric substrates. Y.L. thanks Prof. Lawrence M. Cathles (Earth and Atmospheric Science, Cornell University) for giving priceless help in discussing the paper and for English guidance.
dc.publisherAmerican Chemical Society (ACS)
dc.titleBoundary Lubrication of PEO-PPO-PEO Triblock Copolymer Physisorbed on Polypropylene, Polyethylene, and Cellulose Surfaces
dc.typeArticle
dc.contributor.departmentMaterials Science and Engineering Program
dc.identifier.journalIndustrial & Engineering Chemistry Research
dc.contributor.institutionDepartment of Fiber Science and Apparel Design, Cornell University, Ithaca, NY 14853, United States
dc.contributor.institutionDepartment of Forest Biomaterials, North Carolina State University, Campus Box 8005, Raleigh, NC 27695-8005, United States
dc.contributor.institutionSchool of Chemical Technology, Department of Forest Products Technology, Aalto University, P. O. Box 16300, FI-00076 Aalto, Finland
kaust.personLi, Yangyang
kaust.grant.fundedcenterKAUST-Cornell Center for Energy and Sustainability
dc.date.published-online2012-02-10
dc.date.published-print2012-02-22


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