Confined crystallization in phase-separated poly(ethylene
terephthalate)/poly(ethylene naphthalene 2,6-dicarboxilate) blends |
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Authors: | C?álvarez A?Nogales M C?García-Gutiérrez A?Sanz Z?Denchev S S?Funari M?Bruix Email author" target="_blank">T A?EzquerraEmail author |
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Institution: | Instituto de Estructura de la Materia, CSIC, Serrano 19, 28006 Madrid, Spain. imte155@iem.cfmac.csic.es |
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Abstract: | The isothermal cold crystallization of poly(ethylene terephthalate)(PET) in
cryogenic mechanical alloyed blends of PET and Poly(ethylene naphthalene
2,6-dicarboxilate)(PEN) 1:1 by weight has been investigated by simultaneous
small and wide angle X-ray scattering (SAXS and WAXS) and dielectric
spectroscopy (DS). For transesterification levels higher than 23% the
blends tend to transform into a one-phase system and the crystallization of
PET is strongly inhibited due to the significant reduction of the PET
segment length. For lower levels of transesterification the blends are phase
separated and the overall crystallization behaviour can be explained
considering the confined nature of the PET domains in these blends. The
formation of a rigid amorphous phase in the intra-lamellar stack amorphous
regions is reduced in the blends due to a lower probability of stack
formation in the confined PET-rich domains. The more effective filling of
the space by the lamellar crystals in the blends provokes a stronger
restriction to the amorphous phase mobility of PET in the blends than in
pure PET. |
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