Linked Life Data

19715326

Source:http://linkedlifedata.com/resource/pubmed/id/19715326

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
19
pubmed:dateCreated
2009-9-30
pubmed:abstractText
The surface chemistry and in-depth distribution of the composition of a poly(ethylene oxide) (PEO)-containing biodegradable poly(L-lactic acid) (PLLA) blend matrix system have been investigated using X-ray photoelectron spectroscopy (XPS). This study reports detailed quantitative compositional information using a novel numerical method for determining depth profiles. The PEO system studied is an amphiphilic Pluronic P104 surfactant, PEO-b-poly(propylene oxide) (PPO)-b-PEO. The extent of phase separation is analyzed by determining the surface enrichment of the PEO component via measurement of chemical composition at the polymer-air interface. For this blend system, the combination of the PPO component in the Pluronic surfactants drives the formation of a surface excess of Pluronic in the blends with PLLA. The surface excess profile shows a rapid increase in Pluronic surface composition versus bulk Pluronic mass fractions of 1-5%, but the profile levels off above bulk Pluronic mass fractions of 5%.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0743-7463
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
11467-71
pubmed:dateRevised
2011-9-22
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Phase separation at the surface of poly(ethylene oxide)-containing biodegradable poly(L-lactic acid) blends.
pubmed:affiliation
Department of Chemistry, State University of New York, Buffalo, New York 14260, USA.
pubmed:publicationType
Journal Article