Publication:
Time-dependent morphology development in segmented polyetherurea copolymers based on aromatic diisocyanates

dc.contributor.coauthorDas, S.
dc.contributor.coauthorWilkes, G. L.
dc.contributor.departmentDepartment of Chemistry
dc.contributor.kuauthorYılgör, Emel
dc.contributor.kuauthorYılgör, İskender
dc.contributor.schoolcollegeinstituteCollege of Sciences
dc.date.accessioned2024-11-09T23:05:23Z
dc.date.issued2009
dc.description.abstractTime-dependent morphology development in segmented polyureas obtained by the stoichiometric reactions between amine terminated poly(tetramethylene oxide) (PTMO) and aromatic diisocyanates were investigated. Polyureas were prepared by reacting aminopropyl terminated PTMO oligomer (M(n) = 1100 g/mol) and various aromatic diisocyanates, such as 1,4-phenylene diisocyanate (PPDI), 1,3-phenylene diisocyanate (MPDI), diphenylmethane diisocyanate (MDI), and tolylene diisocyanate (TDI). Time-dependent FTIR studies were conducted on thin films cast onto KBr discs, which were annealed at 200 degrees C for 10 min in an air oven. After removing from the oven, samples were placed into the FTIR spectrometer at room temperature, where time-dependent spectra were recorded until equilibrium was reached. Time-dependent peak reorganization in 3500-3100 cm(-1) (N-H region), 1750-1450 cm(-1) (C=O region or amide I and amide II regions), and 1180-1020 cm(-1) (C-O-C) were monitored. Depending on the chemical structure and the symmetry of the diisocyanate, major differences were observed in the time needed to reach an equilibrium morphology in these homologous poly(ether urea) copolymers. Symmetric PPDI-based polyurea reached equilibrium in about I h compared with its asymmetric MPDI-based counterpart, which needed about 150 h. Microphase development of the MPDI urea was also characterized by AFM, which gave similar results.
dc.description.indexedbyWOS
dc.description.indexedbyScopus
dc.description.issue5
dc.description.openaccessNO
dc.description.publisherscopeInternational
dc.description.sponsoredbyTubitakEuN/A
dc.description.volume47
dc.identifier.doi10.1002/polb.21652
dc.identifier.eissn1099-0488
dc.identifier.issn0887-6266
dc.identifier.scopus2-s2.0-62149112566
dc.identifier.urihttps://doi.org/10.1002/polb.21652
dc.identifier.urihttps://hdl.handle.net/20.500.14288/8794
dc.identifier.wos263618200003
dc.keywordsHydrogen bonding
dc.keywordsIR spectroscopy
dc.keywordsMorphology
dc.keywordsPolyurethanes structure-property relationships
dc.keywordsPhase-separation
dc.keywordsHard segments
dc.keywordsPolyurethane morphology
dc.keywordsMechanical-properties
dc.keywordsBlock copolymers
dc.keywordsX-ray
dc.keywordsBehavior
dc.keywordsUrethane
dc.keywordsSpectroscopy
dc.language.isoeng
dc.publisherJohn Wiley & Sons Inc
dc.relation.ispartofJournal of Polymer Science Part B-Polymer Physics
dc.subjectPolymers
dc.subjectPolymerization
dc.titleTime-dependent morphology development in segmented polyetherurea copolymers based on aromatic diisocyanates
dc.typeJournal Article
dspace.entity.typePublication
local.contributor.kuauthorYılgör, İskender
local.contributor.kuauthorYılgör, Emel
local.publication.orgunit1College of Sciences
local.publication.orgunit2Department of Chemistry
relation.isOrgUnitOfPublication035d8150-86c9-4107-af16-a6f0a4d538eb
relation.isOrgUnitOfPublication.latestForDiscovery035d8150-86c9-4107-af16-a6f0a4d538eb
relation.isParentOrgUnitOfPublicationaf0395b0-7219-4165-a909-7016fa30932d
relation.isParentOrgUnitOfPublication.latestForDiscoveryaf0395b0-7219-4165-a909-7016fa30932d

Files