Publication:
Probing the hard segment phase connectivity and percolation in model segmented poly(urethane urea) copolymers

dc.contributor.coauthorSheth, Jignes P.
dc.contributor.coauthorWilkes, Garth L.
dc.contributor.coauthorFornof, Ann R.
dc.contributor.coauthorLong, Timothy E.
dc.contributor.departmentDepartment of Chemistry
dc.contributor.kuauthorYılgör, İskender
dc.contributor.kuprofileFaculty Member
dc.contributor.otherDepartment of Chemistry
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.contributor.yokid24181
dc.date.accessioned2024-11-09T23:54:44Z
dc.date.issued2005
dc.description.abstractSoluble model segmented poly(urethane urea)s (PUU) with or without hard segment (HS) branching were utilized to explore the importance of hydrogen bonding and chain architecture in mediating the long-range connectivity of the HS phase. The HS content of all the PUU copolymers was 22 wt %, and the soft segment (MW 970 g/mol) was a heterofed random copolymer of 50:50 ethylene oxide:propylene oxide, which possesses a single terminal hydroxyl group (monol). An 80:20 isomeric mixture of 2,4- and 2,6-toluene diisocyanate, 4,4',4"-triphenylmethane triisocyanate and water were utilized during the chain extension step of the synthesis to incorporate HS branching. DSC and SAXS results on the final plaques indicated that the samples were still able to establish a microphase morphology even in the presence of the highest extent of HS branching utilized in the study. The tapping-mode AFM phase image of the PUU sample without HS branching exhibited the presence of long ribbonlike hard domains that percolated through the soft matrix. The long-range connectivity of the HS was increasingly disrupted with higher levels of HS branching. Accompanying such disruption was a systematic mechanical softening of the PUU samples. FT-IR indicated that incorporation of HS branching disrupted the hydrogen-bonded network within the hard phase. These results demonstrate the importance of hydrogen bonding and chain architecture in mediating the long-range connectivity and percolation of the HS and achieving dimensional stability.
dc.description.indexedbyWoS
dc.description.indexedbyScopus
dc.description.issue13
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.volume38
dc.identifier.doi10.1021/ma048222v
dc.identifier.eissn1520-5835
dc.identifier.issn0024-9297
dc.identifier.quartileQ1
dc.identifier.scopus2-s2.0-22744456841
dc.identifier.urihttp://dx.doi.org/10.1021/ma048222v
dc.identifier.urihttps://hdl.handle.net/20.500.14288/15250
dc.identifier.wos230023400047
dc.keywordsFlexible polyurethane foams
dc.keywordsLithium-chloride
dc.keywordsMorphologies
dc.languageEnglish
dc.publisherAmerican Chemical Society (ACS)
dc.sourceMacromolecules
dc.subjectPolymers
dc.subjectPolymerization
dc.titleProbing the hard segment phase connectivity and percolation in model segmented poly(urethane urea) copolymers
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.authorid0000-0002-7756-4192
local.contributor.kuauthorYılgör, İskender
relation.isOrgUnitOfPublication035d8150-86c9-4107-af16-a6f0a4d538eb
relation.isOrgUnitOfPublication.latestForDiscovery035d8150-86c9-4107-af16-a6f0a4d538eb

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