Fractionated Crystallization of Defect-Free Poly(3-hexylthiophene).
ACS Macro Lett
; 1(10): 1170-1175, 2012 Oct 16.
Article
em En
| MEDLINE
| ID: mdl-35607189
ABSTRACT
Fractionated crystallization (FC), a chain-sorting mechanism by length, is identified in well-defined, low molecular weight, and defect-free regioregular poly(3-hexylthiophene) by X-ray scattering and calorimetry of bulk samples. While wide-angle X-ray scattering (WAXS) qualitatively suggests that the degree of crystallinity is similar in all investigated samples, the melting enthalpies are largely different. We ascribe this to intricacies in the integration of the melting and crystallization peaks in calorimetric experiments, which is caused by FC occurring over a large temperature range. The extent of FC decreases with increasing molecular weight and increases with increasing polydispersity. The temperature-dependent investigation of the long period LP and the (100)-WAXS reflection of a sample in which FC is absent allows to disentangle effects from main-chain and side-chain crystallization.
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01-internacional
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MEDLINE
Idioma:
En
Revista:
ACS Macro Lett
Ano de publicação:
2012
Tipo de documento:
Article