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dc.contributor.advisorHsieh, Fu-hungeng
dc.contributor.authorXing, Rui (Biological engineer)eng
dc.date.issued2014eng
dc.date.submitted2014 Falleng
dc.description"May 2014."eng
dc.descriptionThesis supervisor: Fu-hung Hsieh.eng
dc.description.abstractPolyurethane foams have a wide variety of commercial applications in daily life due to their unique advantages. Traditionally, polyurethane foams are made from petroleum-based polyols and isocyanates. Due to the shortage of fossil resources, renewable biobased materials are studied as alternatives to petroleum. In this project, castor oil was chosen as a renewable biobased polyol in order to replace the nonrenewable petroleum-based polyols. Water-blown rigid foams were made from polyols with different levels of castor oil replacement. For foams without castor oil and with 25% castor oil replacement, the effects of water added content were studied. Another group of foams made from a castor oil/ glycerol mixture were also prepared to investigate the effects of hydroxyl number. With the help of glycerol, rigid polyurethane foams with 80%-95% castor oil replacement were successfully prepared and showed competitive physical properties. Water-blown flexible foams were made from polyols using different levels of castor oil replacement. At the same time, the influence of cross-linker contents and isocyanate index on flexible foam was studied. Considering the low reaction rate of castor oil during the synthesis of polyurethane, a specific "heated mold" method was applied. Density, compression force deflection (CFD), 50% constant deflection compression (CDC), tear resistance (TR) and resilience were tested to identify the physical properties of flexible polyurethane foams. Results show that castor oil replacement often leads to a high cross-linking density. With 0.5% necessary cross-linker and low isocyanate index, flexible polyurethane foams with 100% castor oil replacement showed a good recovery property and proved to be a suitable alternative to nonrenewable petroleum-based polyols.eng
dc.description.bibrefIncludes bibliographical references (pages 90-96).eng
dc.format.extent1 online resource (ix, 96 pages) : illustrations (some color) + 2 supplementary files.eng
dc.identifier.merlinb109695677eng
dc.identifier.oclc917734354eng
dc.identifier.urihttps://hdl.handle.net/10355/44345
dc.identifier.urihttps://doi.org/10.32469/10355/44345eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.sourceSubmitted by University of Missouri--Columbia Graduate School.eng
dc.subjectAuthor supplied: polyurethane, castor oil, biological processingeng
dc.subject.lcshPolyurethaneseng
dc.subject.lcshFoameng
dc.titlePolyurethane foams containing renewable castor oil replacementeng
dc.typeThesiseng
thesis.degree.disciplineBiological engineering (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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