New Morphologies and Phase Transitions of Rod–Coil Dendritic–Linear Block Copolymers Depending on Dendron Generation and Preparation Procedure
New Morphologies and Phase Transitions of Rod–Coil Dendritic–Linear Block Copolymers Depending on Dendron Generation and Preparation Procedure
复制标题
DOI：
10.1021/ma402112n
复制
发表时间：
2014-01
期刊：
影响因子：
5.5
通讯作者：
Huanhuan Cai;Guoliang Jiang;Chongyi Chen;Zhibo Li;Zhihao Shen;Xinghe Fan
中科院分区：
文献类型：
--
作者：
Huanhuan Cai;Guoliang Jiang;Chongyi Chen;Zhibo Li;Zhihao Shen;Xinghe Fan
以亲水性聚乙二醇（PEG）为端基的半刚性Percec型树枝状分子和棒状介晶夹套液晶聚合物聚{2，5-双[（4′-甲氧基苯基）氧羰基]苯乙烯}（PMPCS）为骨架，成功地合成了两亲性棒状-卷曲树枝状-线性嵌段共聚物PEG（Gm）-b-PMPCS（m = 1，2，3）.自组装结构经历了从囊泡通过大的复合囊泡（LCV）短的圆柱形胶束随着树枝化生成的过渡。PEG（G2）-b-PMPCS在四氢呋喃和水的混合溶剂中形成具有窄尺寸分布的多孔表面的稳定的LCV。通过改变水的加入速率，研究了纳米级和微米级超分子结构的形成机理。它包括两个步骤：形态转化和囊泡融合或分化。无论初始形态如何，囊泡都是LCV的前体。然而，FI…
Amphiphilic rod–coil dendritic–linear block copolymers PEG(Gm)-b-PMPCS (where m is the number of dendron generation, and m = 1, 2, 3) composed of a semirigid Percec-type dendron with hydrophilic poly(ethylene glycol) (PEG) tails and a rod-like mesogen-jacketed liquid crystalline polymer, poly{2,5-bis[(4′-methoxy-phenyl)oxycarbonyl]styrene} (PMPCS), were successfully prepared. The self-assembled structures undergo a transition from vesicles through large compound vesicles (LCVs) to short cylindrical micelles with increasing dendron generation. PEG(G2)-b-PMPCS forms stable LCVs with porous surfaces of a narrow size distribution in a mixed solvent of tetrahydrofuran and water. The formation mechanism of the supramolecular structure with nano- and microsized scales is studied through changing the rate of water addition. It is composed of two steps: morphological transformation and vesicles fusion or differentiation. Vesicles are precursors for LCVs regardless of what the initial morphology is. However, the fi...