Publication:
Structure-property behavior of poly(dimethylsiloxane) based segmented polyurea copolymers modified with poly(propylene oxide)

dc.contributor.coauthorSheth, Jignes P.
dc.contributor.coauthorWilkes, Garth L.
dc.contributor.departmentDepartment of Chemistry
dc.contributor.kuauthorErentürk, Ayşe Burçin
dc.contributor.kuauthorÖzhalıcı, Hayriye
dc.contributor.kuauthorYılgör, Emel
dc.contributor.kuauthorYılgör, İskender
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.date.accessioned2024-11-09T23:22:10Z
dc.date.issued2005
dc.description.abstractPoly(propylene oxide) (PPO) was incorporated in a controlled manner between poly(dimethylsiloxane) (PDMS) and urea segments in segmented polyurea copolymers and their solid state structure-property behavior was investigated. The copolymers contained PDMS segments of MW 3200 or 7000 g/mol and an overall hard segment content of wt%. PPO segments of MW 450 or 2000 g/mol were utilized. Equivalent polyurea copolymers based on only PDMS as the soft segment (SS) component were used as controls. The materials (with or without PPO) utilized in this study were able to develop microphase morphology as determined from dynamic mechanical analysis (DMA) and small angle X-ray scattering (SAXS). DMA and SAXS results suggested that the ability of the PPO segments to hydrogen bond with the urea segments results in a limited inter-segmental mixing which leads to the formation of a gradient interphase, especially in the PPO-2000 co-SS containing copolymers. DMA also demonstrated that the polyureas based on only PDMS as the SS possessed remarkably broad and nearly temperature insensitive rubbery plateaus that extended up to ca. 175 degrees C, the upper temperature limit depending upon the PDMS MW. However, the incorporation of PPO resulted in more temperature sensitive rubbery plateaus. A distinct improvement in the Young's modulus, tensile strength, and elongation at break in the PPO-2000 and PDMS-7000 containing copolymers was observed due to inter-segmental hydrogen bonding and the formation of a gradient interphase. However, when PPO was incorporated as the co-SS, the extent of stress relaxation and mechanical hysteresis of the copolymers increased relative to the segmented polyureas based on the utilization of only PDMS as the soft segment component.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.issue19
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.volume46
dc.identifier.doi10.1016/j.polymer.2005.06.050
dc.identifier.eissn1873-2291
dc.identifier.issn0032-3861
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-23944456364
dc.identifier.urihttps://doi.org/10.1016/j.polymer.2005.06.050
dc.identifier.urihttps://hdl.handle.net/20.500.14288/11023
dc.identifier.wos231573100043
dc.keywordsPolyurethanes
dc.keywordsPoly(dimethylsiloxane)
dc.keywordsPoly(propylene oxide) glass-transition
dc.keywordsUrea copolymers
dc.keywordsPolydimethylsiloxane
dc.keywordsUrethane
dc.keywordsElastomers
dc.language.isoeng
dc.publisherElsevier
dc.relation.ispartofPolymer
dc.subjectPolymers
dc.subjectPolymerization
dc.titleStructure-property behavior of poly(dimethylsiloxane) based segmented polyurea copolymers modified with poly(propylene oxide)
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorYılgör, Emel
local.contributor.kuauthorErentürk, Ayşe Burçin
local.contributor.kuauthorÖzhalıcı, Hayriye
local.contributor.kuauthorYılgör, İskender
local.publication.orgunit1College of Sciences
local.publication.orgunit2Department of Chemistry
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relation.isOrgUnitOfPublication.latestForDiscovery035d8150-86c9-4107-af16-a6f0a4d538eb
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