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¸å¼þ£ºExploring crystal structures of semicrystalline polymers is of both scientific and
technological interest and importance because of their dramatic impact on most of
their performances.1,2 Spherulites, as the most common morphology of polymer
crystal, can be obtained when many polymers crystallized from cooling melt or
concentrating solution. Specially, ring-banded spherulites, as interesting and
representative morphological feature of polymer crystalline aggregates, have been
attracting considerable attention for several decades.3-7
·¢±íµÄÎÄÕ£ºExploring crystal morphologies of semicrystalline polymers is of
both scientific and technological interest and importance
because of their dramatic impact on material performance.1−4
Spherulites, as the most common morphology, can be
encountered when polymers crystallized from disordered melt
or concentrated solution. Specially, ring-banded spherulites
have received extensive attention due to their attractive feature.

µÚ¶þ´¦£º
¸å¼þ£ºGenerally, in ultrathin films of crystallized polymer, in addition
to extinction banding, concentric rings that possess sharp contrast in both polarized
and unpolarized light,24,25 or even appear directly opposite optical features with
extinction banding, i.e., poor contrast under polarized light and clear appearance in
unpolarized light,26-29 were also observed in two-dimensional polymer spherulites.
Actually, these concentric rings are a reflection of periodic change of thickness
caused by the rhythmic-crystallization-induced structural discontinuity.
Ring-banded spherulites with this kind of discrete structure also occurred in some
polymer blends.30-32
·¢±íµÄÎÄÕ£ºYet, in thin films, in addition to
extinction banding, concentric rings that possess sharp contrast
in both polarized and unpolarized light,10,11 or even appear
directly opposite optical features with extinction banding, i.e.,
poor contrast under polarized light and clear appearance in
unpolarized light,12−15 were also observed in two-dimensional
polymer spherulites. Actually, these concentric rings are a
reflection of periodic change of thickness stemming from
rhythmic-crystallization-induced structural discontinuity. Ringbanded
spherulites with the discrete structure also occurred in
some polymer blends.16−18

µÚÈý´¦£º
¸å¼þ£ºConsequently, the effects of structural feature and crystallization condition on
polymer lamellar packing and orientation and then formation of different
ring-banded spherulites are quite unclear. In the present work, we further explored
the spherulite morphologies of poly(trimethylene terephthalate) from a standpoint
of controlling lamellar packing by tuning the crystallization condition aiming to
reveal the possible factors that influence lamellar actions and the appearance of
ring-banded shperulites. To our knowledge, it is the first time that two kinds of
ring-banded spherulites were encountered in the same homopolymer.
Morphological transitions among different spherulites and the crystallization of
PTT were analyzed. Finally, we discussed the effects of crystallization condition on
radial lamellar organization of polymer spherulites.
·¢±íµÄÎÄÕÂ:Concomitantly,
the effects of structural feature and crystallization
condition on radial lamellar packing and orientation and then
formation of different ring-banded spherulites are quite unclear.
In the present work, we further explored the spherulite
morphologies of a highly asymmetrical poly(¦Å-caprolactone-bethylene
oxide) diblock copolymer from a standpoint of tuning
lamellar organization by controlling evaporation of solutioncast
films in an attempt to unveil possible factors that govern
radial lamellar packing and orientation and then appearance of
different ring-banded patterns in polymer thin films.
To our knowledge, it is the first time that three kinds of ring-banded
spherulites were encountered in the same polymer. Morphological
transitions among various spherulites and the crystallization
of PEO block were also analyzed. Finally, we discussed
the effects of structural feature and crystallization condition on
radial lamellar organization of polymer spherulites.
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