Linked Life Data

18307339

Source:http://linkedlifedata.com/resource/pubmed/id/18307339

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11
pubmed:dateCreated
2008-3-14
pubmed:abstractText
This work shows that low charge density poly(p-phenylene-ethynylene)s (PPE-SO3Na-L and PPE-CO2Na-L), which feature sulfonate and carboxylate groups on every other phenyl ring, form aggregates in water, whereas high charge density poly(p-phenylene-ethynylene)s (PPE-SO3Na-H and PPE-CO2Na-H), which possess sulfonate or carboxylate groups on every phenyl ring, do not aggregate in water. The formation of aggregates of PPE-SO3Na-L and PPE-CO2Na-L is demonstrated by comparing the concentration and temperature dependence of their steady-state spectra in water to that in DMSO, in which the two polymers do not aggregate. For the weak polyelectrolytes PPE-CO2Na-H and PPE-CO2Na-L, the solution pH was changed to vary the charge density. In addition, the cationic surfactant, octadecyltrimethyl ammonium, is shown to dissociate the low charge density polymer aggregates and to form supramolecular complexes with each of the different polyelectrolytes. Fluorescence correlation spectroscopy was applied to provide insight into the sizes of aggregates under different solution conditions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1520-6106
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
112
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3300-10
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Charge density effects on the aggregation properties of poly(p-phenylene-ethynylene)-based anionic polyelectrolytes.
pubmed:affiliation
Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.