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Complex Self-Assembly Behavior of Bis-hydrophilic PEO-b-PCL-b-PMOXA Triblock Copolymers in Aqueous Solution
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.macromol.7b01498 Evgeniia V. Konishcheva 1 , Ulmas E. Zhumaev 2 , Maximilian Kratt 1 , Valentin Oehri 1 , Wolfgang Meier 1
Macromolecules ( IF 5.1 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.macromol.7b01498 Evgeniia V. Konishcheva 1 , Ulmas E. Zhumaev 2 , Maximilian Kratt 1 , Valentin Oehri 1 , Wolfgang Meier 1
Affiliation
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We report aqueous self-assembly of linear amphiphilic triblock copolymers poly(ethylene oxide)-block-polycaprolactone-block-poly(2-methyl-2-oxazoline) (PEO-b-PCL-b-PMOXA) and their PEO-b-PCL precursors with different PCL and PMOXA block lengths using three preparation methods: film rehydration, solvent evaporation, and cosolvent. For PEO-b-PCL, the self-assembled structures were ordinary spherical particles and polymersomes. For PEO-b-PCL-b-PMOXA, we observed polymersomes with asymmetric membrane, cloud-like aggregates, elongated particles, Y-shaped elongated particles, and 3D networks. All structures were of micrometer size and characterized using laser scanning microscopy (LSM). 3D networks were also characterized using z-stack confocal LSM, transmission electron microscopy (TEM), and cryogenic TEM. We demonstrated that film rehydration method results in pseudoequilibrium structures, whereas structures formed using solvent evaporation and cosolvent methods are under kinetic control. We showed how kinetically controlled structures can be transformed into pseudoequilibrium morphologies.
中文翻译：
双亲水性PEO- b -PCL- b -PMOXA三嵌段共聚物在水溶液中的复杂自组装行为
我们报告水溶液的自组装的两亲性线型三嵌段共聚物的聚（环氧乙烷） -嵌段-polycaprolactone-块-聚（2-甲基-2-恶唑啉）（PEO- b -PCL- b -PMOXA）和它们的PEO- b -具有三种PCL和PMOXA嵌段长度的PCL前体可使用三种制备方法：薄膜水化，溶剂蒸发和助溶剂。对于PEO - b -PCL，自组装结构是普通的球形颗粒和聚合物小体。对于PEO- b -PCL- b-PMOXA，我们观察到具有不对称膜，云状聚集体，细长颗粒，Y形细长颗粒和3D网络的聚合物囊泡。所有结构均具有微米尺寸，并使用激光扫描显微镜（LSM）进行表征。3D网络还使用z- stack共聚焦LSM，透射电子显微镜（TEM）和低温TEM进行了表征。我们证明了膜水化方法会导致假平衡结构，而使用溶剂蒸发和助溶剂方法形成的结构则处于动力学控制之下。我们展示了如何将动力学控制的结构转化为假平衡形态。
更新日期：2017-09-08
中文翻译：
双亲水性PEO- b -PCL- b -PMOXA三嵌段共聚物在水溶液中的复杂自组装行为
我们报告水溶液的自组装的两亲性线型三嵌段共聚物的聚（环氧乙烷） -嵌段-polycaprolactone-块-聚（2-甲基-2-恶唑啉）（PEO- b -PCL- b -PMOXA）和它们的PEO- b -具有三种PCL和PMOXA嵌段长度的PCL前体可使用三种制备方法：薄膜水化，溶剂蒸发和助溶剂。对于PEO - b -PCL，自组装结构是普通的球形颗粒和聚合物小体。对于PEO- b -PCL- b-PMOXA，我们观察到具有不对称膜，云状聚集体，细长颗粒，Y形细长颗粒和3D网络的聚合物囊泡。所有结构均具有微米尺寸，并使用激光扫描显微镜（LSM）进行表征。3D网络还使用z- stack共聚焦LSM，透射电子显微镜（TEM）和低温TEM进行了表征。我们证明了膜水化方法会导致假平衡结构，而使用溶剂蒸发和助溶剂方法形成的结构则处于动力学控制之下。我们展示了如何将动力学控制的结构转化为假平衡形态。
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