Publication:
Effect of chemical composition on large deformation mechanooptical properties of high strength thermoplastic poly(urethane urea)s

dc.contributor.coauthorCurgul, Sezen
dc.contributor.coauthorÇakmak, Miko
dc.contributor.departmentDepartment of Chemistry
dc.contributor.departmentDepartment of Chemistry
dc.contributor.departmentDepartment of Chemical and Biological Engineering
dc.contributor.kuauthorYılgör, İskender
dc.contributor.kuauthorYılgör, Emel
dc.contributor.kuauthorErman, Burak
dc.contributor.kuprofileFaculty Member
dc.contributor.kuprofileResearcher
dc.contributor.kuprofileFaculty Member
dc.contributor.otherDepartment of Chemistry
dc.contributor.otherDepartment of Chemical and Biological Engineering
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.schoolcollegeinstituteCollege of Engineering
dc.contributor.yokid24181
dc.contributor.yokid40527
dc.contributor.yokid179997
dc.date.accessioned2024-11-09T23:20:24Z
dc.date.issued2004
dc.description.abstractThe effect of composition on the true mechanooptical properties of thermoplastic poly(urethane urea)s was investigated by selectively varying the type and content of soft and hard segments. Real-time stress-strain-birefringence data together with off-line wide-angle X-ray scattering measurements revealed that soft segment and chain extender play dominant roles on the chemical structures of the poly(urethane urea)s. All poly(tetramethylene oxide) glycol-based samples showed the same crystal structure. The samples containing ethylenediamine as the chain extender showed enhanced crystallizability as compared to those with 1,6-diaminohexane no matter which soft segment was used. In general, samples with lower fraction of hard segment exhibited higher crystallizability than their high hard segment counterparts. Long-term holding of poly(ethylene oxide) samples in stretched state was found to increase crystallinity. The strain-induced crystallization in low hard segment content poly(tetramethylene oxide)based samples was only observed at very high deformation levels. on the other hand, crystallization in the samples containing high hard segment was found to evolve gradually over large deformation range. The strain rate has a considerable effect on the crystallization behavior of poly(tetramethylene oxide)based samples. While the low hard segment content poly(tetramethylene oxide) sample experiences decreasing crystallizability as the strain rate increases, its counterpart containing higher fraction of hard segments exhibits opposite behavior. We have investigated linear and nonlinear stress optical behavior and observed that the span of the initial linear stress optical region varied primarily with composition (slope ranging from 0.1 to 2.2 GPa(-1)) and secondarily with the deformation rate. Hysteresis experiments show that there is a considerable loss of energy in cyclic loading of these materials, and hysteresis increases as the chain extender is changed from 1,6-diaminohexane to ethylenediamine.
dc.description.indexedbyWoS
dc.description.indexedbyScopus
dc.description.issue23
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.volume37
dc.identifier.doi10.1021/ma049018a
dc.identifier.eissn1520-5835
dc.identifier.issn0024-9297
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-9744284208
dc.identifier.urihttp://dx.doi.org/10.1021/ma049018a
dc.identifier.urihttps://hdl.handle.net/20.500.14288/10713
dc.identifier.wos225056800028
dc.keywordsUrethane elastomers
dc.keywordsX-ray
dc.keywordsPolyurethane
dc.keywordsBirefringence
dc.keywordsHysteresis
dc.keywordsMorphology
dc.languageEnglish
dc.publisherAmer Chemical Soc
dc.sourceMacromolecules
dc.subjectPolymers
dc.subjectPolymerization
dc.titleEffect of chemical composition on large deformation mechanooptical properties of high strength thermoplastic poly(urethane urea)s
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.authorid0000-0002-7756-4192
local.contributor.authorid0000-0001-9133-3377
local.contributor.authorid0000-0002-2496-6059
local.contributor.kuauthorYılgör, İskender
local.contributor.kuauthorYılgör, Emel
local.contributor.kuauthorErman, Burak
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relation.isOrgUnitOfPublication.latestForDiscovery035d8150-86c9-4107-af16-a6f0a4d538eb

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