Linked Life Data

18582009

Source:http://linkedlifedata.com/resource/pubmed/id/18582009

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
29
pubmed:dateCreated
2008-7-21
pubmed:abstractText
The structure and dynamics of a supramolecular polymer formed by a bisurea-type compound, 2,4-bis(2-ethylhexylureido)toluene (EHUT), in an apolar solvent, n-dodecane (C12), were examined in detail. The EHUT/C12 organo-gel system forms long, dynamic chain-like supramolecular polymers, which lead to an entangled network showing remarkable viscoelastic behavior with two major relaxation modes. A slow relaxation mode with an approximately constant relaxation time, tauS, was observed in a flow region and the other, fast, relaxation mode with a time tauF1 (<tauS) was observed in a high-frequency range. Because no dielectric relaxation behavior was observed over a frequency region including the mechanical tauS and tauF1 relaxation modes, the formed supramolecular polymer does not possess any total dipole moment due to antiparallel intermolecular hydrogen bonding of the two ureido groups of each EHUT unit. A structural model for the supramolecular polymer formed in EHUT/C12 is proposed based on force-field simulations. This proposed model is consistent with all the experimental data concerning this system: flow birefringence measurements, dielectric spectroscopy, SANS, and FTIR.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jul
pubmed:issn
1520-6106
pubmed:author
pubmed:issnType
Print
pubmed:day
24
pubmed:volume
112
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
8459-65
pubmed:year
2008
pubmed:articleTitle
Structure and dynamics of a bisurea-based supramolecular polymer in n-dodecane.
pubmed:affiliation
Department of Macromolecular Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. shikata@chem.sci.osaka-u.ac.jp
pubmed:publicationType
Journal Article