Bilayers and interdigitation in block copolymer vesicles
Bilayers and interdigitation in block copolymer vesicles
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DOI：
10.1021/ja050742y
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发表时间：
2005-06-22
影响因子：
15
通讯作者：
Ryan, AJ
中科院分区：
文献类型：
--
作者：
Battaglia, G;Ryan, AJ
两亲性嵌段共聚醚组装成厚度在2.4 - 7.5 nm之间的膜。两种结构的二嵌段共聚物和三嵌段共聚物的小角x射线散射结合电镜证实了其囊泡形态。膜厚度随疏水嵌段长度的变化规律与嵌段共聚物熔体的强偏析理论一致，表明疏水链在囊泡膜内呈混合拉伸构象。这一结果与先前发表的结果相反，在先前的结果中，观察到疏水膜具有双层几何结构和聚合物链，相对于理想的高斯维数没有受到干扰。
Amphiphilic block copolyethers assemble into membranes with thickness between 2.4 and 7.5 nm. The vesicular morphology has been confirmed by small-angle X-ray scattering combined with electron microscopy for diblock copolymers and triblock copolymers of both architectures. The scaling of the membrane thicknesses with the length of the hydrophobic block is in good agreement with the strong segregation theory for block copolymer melts, indicating a mixed and stretched conformation of the hydrophobic chain inside the vesicle membrane. This result is in contrast to previously published results where the hydrophobic membranes were observed to have bilayer geometry and polymer chains that are relatively unperturbed from their ideal Gaussian dimensions.