Reversible Transformation of Nanostructured Polymer Particles
Reversible Transformation of Nanostructured Polymer Particles
复制标题
纳米结构聚合物颗粒的可逆转变
DOI：
10.1021/ma401398h
复制
发表时间：
2013-09-10
期刊：
影响因子：
5.5
通讯作者：
Zhu, Jintao
中科院分区：
文献类型：
--
作者：
Deng, Renhua;Liang, Fuxin;Zhu, Jintao
通过溶剂吸附退火证明了纳米结构嵌段共聚物颗粒的整体形状和内部结构以及表面组成的可逆转变。在3D软约束条件下，通过自组装得到了PS和P4 VP层状畴交替堆叠的PS-b-P4 VP蛹状粒子.氯仿，一个很好的溶剂，为两个块，选择溶胀和退火蛹状颗粒悬浮在水介质中。通过简单地调节颗粒/水溶液界面性质，可以容易地调节颗粒的蛹状和洋葱状结构之间的可逆转化。有趣的是，聚（乙烯醇）（PVA）在水介质中的浓度起着决定颗粒形态的关键作用。高浓度的PVA有利于蛹状形态的形成，而极低浓度的PVA有利于洋葱状颗粒的形成。莫洛夫...
A reversible transformation of overall shape and internal structure as well as surface composition of nanostructured block copolymer particles is demonstrated by solvent-adsorption annealing. Polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) pupa-like particles with PS and P4VP lamellar domains alternatively stacked can be obtained by self-assembly of the block copolymer under 3D soft confinement. Chloroform, a good solvent for both blocks, is selected to swell and anneal the pupa-like particles suspended in aqueous media. Reversible transformation between pupa-like and onion-like structures of the particles can be readily tuned by simply adjusting the particle/aqueous solution interfacial property. Interestingly, poly(vinyl alcohol) (PVA) concentration in the aqueous media plays a critical role in determining the particle morphology. High level of PVA concentration is favorable for pupa-like morphology, while extremely low concentration of PVA is favorable for the formation of onion-like particles. Moreove...