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Instruments / Technical Area	Publication Details	Published	Actions
I07-Surface & interface diffraction	Bimodal crystallization at polymer-fullerene interfaces Dyfrig Môn , Anthony Higgins , David James , Mark Hampton , J. Emyr Macdonald , Michael B. Ward , Philipp Gutfreund , Samuele Lilliu , Jonathan Rawle Physical Chemistry Chemical Physics 17 (3), 2216 - 2227 DOI: 10.1039/C4CP04253K Open Access Show Abstract ▼ Abstract: The growth-kinetics of [6,6]-phenyl C61-butyric acid methyl ester (PCBM) crystals, on two different length-scales, is shown to be controlled by the thickness of the polymer layer within a PCBM–polymer bilayer. Using a model amorphous polymer we present evidence, from in situ optical microscopy and grazing-incidence X-ray diffraction (GIXD), that an increased growth-rate of nanoscale crystals impedes the growth of micron-sized, needle-like PCBM crystals. A combination of neutron reflectivity and GIXD measurements, also allows us to observe the establishment of a liquid–liquid equilibrium composition-profile between the PCBM layer and a polymer-rich layer, before crystallization occurs. While the interfacial composition-profile is independent of polymer-film-thickness, the growth-rate of nanoscale PCBM crystals is significantly larger for thinner polymer films. A similar thickness-dependent behavior is observed for different molecular weights of entangled polymer. We suggest that the behavior may be related to enhanced local-polymer-chain-mobility in nanocomposite thin-films.	Nov 2014

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I07-Surface & interface diffraction

Bimodal crystallization at polymer-fullerene interfaces

Dyfrig Môn , Anthony Higgins , David James , Mark Hampton , J. Emyr Macdonald , Michael B. Ward , Philipp Gutfreund , Samuele Lilliu , Jonathan Rawle

Physical Chemistry Chemical Physics 17 (3), 2216 - 2227

DOI: 10.1039/C4CP04253K