Publication:
Contribution of soft segment entanglement on the tensile properties of silicone–urea copolymers with low hard segment contents

dc.contributor.coauthorWilkes, Garth L.
dc.contributor.departmentDepartment of Chemistry
dc.contributor.departmentN/A
dc.contributor.departmentDepartment of Chemistry
dc.contributor.kuauthorYılgör, İskender
dc.contributor.kuauthorEynur, Tuğba
dc.contributor.kuauthorYılgör, Emel
dc.contributor.kuprofileFaculty Member
dc.contributor.kuprofileMaster Student
dc.contributor.kuprofileResearcher
dc.contributor.otherDepartment of Chemistry
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.schoolcollegeinstituteGraduate School of Sciences and Engineering
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.yokid24181
dc.contributor.yokidN/A
dc.contributor.yokidN/A
dc.date.accessioned2024-11-09T23:14:09Z
dc.date.issued2009
dc.description.abstractNovel, segmented thermoplastic silicone-urea (TPSU) copolymers based on rather high molecular weight aminopropyl terminated polydimethylsiloxane (PDMS) soft segments (<M(n)> 10,800 and 31,500 g/mol), a cycloaliphatic diisocyanate (HMDI) and various diamine chain extenders were synthesized. Copolymers with very low urea hard segment contents of 1.43-14.4% by weight were prepared. In spite of very low hard segment contents, solution cast films showed very good microphase separation and displayed reasonable mechanical properties. Tensile strengths of TPSU copolymers showed a linear dependence on their urea hard segment contents, regardless of the structure of the diamine chain extender used. The modulus of silicone-urea copolymers is dependent on the urea concentration, but not on the extender type or PDMS molecular weight. When silicone-urea copolymers with identical urea hard segment contents were compared, copolymers based on PDMS-31,500 showed higher elongation at break values and ultimate tensile strengths than those based on PDMS-10,800. Since the critical entanglement molecular weight (M(e)) of PDMS is about 24,500 g/mol, these results suggest there is a significant contribution from soft segment chain entanglement effects in the PDMS-31,500 system regarding the tensile properties and failure mechanisms of the silicone-urea copolymers.
dc.description.indexedbyWoS
dc.description.indexedbyScopus
dc.description.issue19
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsorshipWacker Chemie, Munich Germany We would like to thank Wacker Chemie, Munich Germany, for providing financial support to this research project. We also would like to thank them for their supply of PDMS oligomers.
dc.description.volume50
dc.identifier.doi10.1016/j.polymer.2009.07.016
dc.identifier.eissn1873-2291
dc.identifier.issn0032-3861
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-69249115843
dc.identifier.urihttp://dx.doi.org/10.1016/j.polymer.2009.07.016
dc.identifier.urihttps://hdl.handle.net/20.500.14288/10107
dc.identifier.wos272959200004
dc.keywordsPolydimethylsiloxane
dc.keywordsPolyurethane
dc.keywordsEntanglement polymers
dc.languageEnglish
dc.publisherElsevier Sci Ltd
dc.sourcePolymer
dc.subjectPolymers
dc.subjectPolymerization
dc.titleContribution of soft segment entanglement on the tensile properties of silicone–urea copolymers with low hard segment contents
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.authorid0000-0002-7756-4192
local.contributor.authoridN/A
local.contributor.authorid0000-0001-9133-3377
local.contributor.kuauthorYılgör, İskender
local.contributor.kuauthorEynur, Tuğba
local.contributor.kuauthorYılgör, Emel
relation.isOrgUnitOfPublication035d8150-86c9-4107-af16-a6f0a4d538eb
relation.isOrgUnitOfPublication.latestForDiscovery035d8150-86c9-4107-af16-a6f0a4d538eb

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