Aggregation in a High Mobility n-type Low Bandgap Copolymer with Implications on Semicrystalline Morphology.
Summary of "Aggregation in a High Mobility n-type Low Bandgap Copolymer with Implications on Semicrystalline Morphology."
We explore the photophysics of P(NDI2OD-T2), a high mobility and air stable n-type donor/acceptor polymer. Detailed steady-state UV-Vis and Photoluminescence measurements on solutions of P(NDI2OD-T2) reveal distinct signatures of aggregation. By performing quantum chemical calculations, we can assign these spectral features to unaggregated and stacked polymer chains. NMR measurements independently confirm the aggregation phenomena of P(NDI2OD-T2) in solution. The detailed analysis of the optical spectra suggests that aggregation is a two-step process with different types of aggregates which we confirm by time-dependent photoluminescence measurements. Analytical ultracentrifugation measurements demonstrate that aggregation takes place within the single polymer chain upon coiling. By transferring these results to thin P(NDI2OD-T2) films, we can conclude that film formation is mainly governed by the chain collapse leading in general to a high aggregate content of ~45%. This process also inhibits the formation of amorphous and disordered P(NDI2OD-T2) films.
This article was published in the following journal.
Name: Journal of the American Chemical Society
Medical and Biotech [MESH] Definitions
Copolymer of divinyl ether and maleic anhydride that acts as an immunostimulant with antineoplastic and anti-infective properties. It is used in combination with other antineoplastic agents.
Electrophoretic Mobility Shift Assay
An electrophoretic technique for assaying the binding of one compound to another. Typically one compound is labeled to follow its mobility during electrophoresis. If the labeled compound is bound by the other compound, then the mobility of the labeled compound through the electrophoretic medium will be retarded.
The upward or downward mobility in an occupation or the change from one occupation to another.
The formation of clumps of RED BLOOD CELLS under low or non-flow conditions, resulting from the attraction forces between the red blood cells. The cells adhere to each other in rouleaux aggregates. Slight mechanical force, such as occurs in the circulation, is enough to disperse these aggregates. Stronger or weaker than normal aggregation may result from a variety of effects in the ERYTHROCYTE MEMBRANE or in BLOOD PLASMA. The degree of aggregation is affected by ERYTHROCYTE DEFORMABILITY, erythrocyte membrane sialylation, masking of negative surface charge by plasma proteins, etc. BLOOD VISCOSITY and the ERYTHROCYTE SEDIMENTATION RATE are affected by the amount of erythrocyte aggregation and are parameters used to measure the aggregation.
A family of HIGH MOBILITY GROUP PROTEINS that bind to NUCLEOSOMES.
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