Polyurethan dissertation

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Polyurethane PU foam is one of the most versatile construction insulations due to its low density, low thermal conductivity, and high mechanical performance. However, it is still highly dependent on petro-based chemicals, i. In this work, biomass, such as rape straw, switchgrass, and yaupon holly Ilex vomitoria were liquefied using microwave energy to produce bio-based polyol in order to substitute petro-based polyol in the production of PU foam. Cellulose nanocrystals CNCs were also extracted from liquefaction solid residue. They were then applied to reinforce high bio-content PU foam.
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Polyurethane dispersion - Wikipedia

Off-campus UMass Amherst users: To download dissertations, please use the following link to log into our proxy server with your UMass Amherst user name and password. Non-UMass Amherst users, please click the view more button below to purchase a copy of this dissertation from Proquest. Some titles may also be available free of charge in our Open Access Dissertation Collection , so please check there first. Jayaraman Krishnamoorthy , University of Massachusetts Amherst. This thesis work deals with a Curing of reactive, hot-melt polyurethane adhesives and b Adsorption studies using different interactions.
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The Rheology of Anionic Aqueous Polyurethane Dispersions

A novel bio-based polyol was synthesized using corn oil and 2-mercaptoethanol via thiol-ene reaction as an alternative to petroleum-based polyol for the synthesis of polyurethane foams. The polyol was analyzed using wet chemical techniques to obtain a hydroxyl number and the viscosity of the polyol. Infrared spectroscopy and gel permeation chromatography were used to confirm the structural properties of the foams. Flame-retardant polyurethane foams were prepared by the addition of different concentrations of dimethyl methyl phosphonate DMMP in the final foam composition.
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Polyurethane PUR is one of the most difficult synthetic polymers to preserve. The main aim of this research is to assist PUR condition assessment on historical objects and define storage conditions for this perishable material 20—50 years. In this thesis, national and international case studies have been included: foams ether- and ester based , films ester-based and fibres etherbased ; showing fair, poor and unacceptable conditions. Based on this approach, different PUR degradation stages are analysed, and visual micro level and molecular pathways for PUR natural ageing are suggested.
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