Crystallinity-driven morphological ripening processes for poly(ethylene oxide)-block-polycaprolactone micelles in water.
Crystallinity-driven morphological ripening processes for poly(ethylene oxide)-block-polycaprolactone micelles in water.
复制标题
DOI：
10.1039/c3sm52950a
复制
发表时间：
2014-03
期刊：
影响因子：
3.4
通讯作者：
Georgios Rizis;T. V. D. van de Ven;A. Eisenberg
中科院分区：
文献类型：
--
作者：
Georgios Rizis;T. V. D. van de Ven;A. Eisenberg
本文描述了聚环氧乙烷-嵌段-聚己内酯(PEO-b-PCL)球形胶束状聚集体(PEO-b-PCL)中核结晶引起的一系列形态转变。最初的自组装步骤，即单个共聚物链结合形成微球，可以重复进行；然而，这些微球的稳定性似乎是有限的，因为透射电子显微镜和光散射数据都表明，初级微球在室温下悬浮在去离子水中时，缓慢转变为拉长的棒状或带状聚集体。尽管球体到杆体的转变通常发生在几天的时间尺度上，但球体形成单个杆体的速度非常快，长杆的数量逐渐增加，而短杆的明显缺乏就是明证。
A set of morphological transformations induced by core crystallization within spherical micelle-like aggregates of poly(ethylene oxide)-block-polycaprolactone (PEO-b-PCL) is described in the present article. The initial self-assembly step, in which individual copolymer chains associate to form the spheres, can be performed reproducibly; the stability of these spheres, however, seems to be limited, as both transmission electron microscopy and light scattering data suggest that the primary spheres transform slowly into elongated rod-like or ribbon-like aggregates when suspended in deionized water at room temperature. Although the sphere-to-rod transition takes place typically over a time scale of several days, the formation of individual rods from spheres is very rapid, as evidenced by the progressive increase in the number of long rods and the conspicuous absence of short rods.