Ordered structure of block polymer/homopolymer mixtures, 4. Vesicle formation and macrophase separation
Ordered structure of block polymer/homopolymer mixtures, 4. Vesicle formation and macrophase separation
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嵌段聚合物/均聚物混合物的有序结构，4. 囊泡形成和宏观相分离
DOI：
10.1002/masy.19920620109
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Hashimoto
中科院分区：
文献类型：
--
作者：
S. Koizumi;H. Hasegawa;T. Hashimoto
研究了聚（苯乙烯-嵌段-异戊二烯）（SI）和均聚苯乙烯（HS）二元混合物的溶剂浇铸薄膜中的自组装结构，作为RS（SI中HS和聚苯乙烯嵌段（PS）的分子量比）和wHS（HS的重量分数）的函数。对于 rS >1)，或者溶解到 PS 微域中，而不使 PS 溶胀，或者使用 wHS 时溶胀程度不会发生显着变化（如果有的话）（在 rS≌1 处）。在后一种情况下，对于此处研究的特定 SI，HS 不会显着影响 PI 的层状域，SI 本身给出 PS 和 PI 的交替层状微域，但会增加它们之间的平均距离。作为wHS1，PI片层的长程空间秩序丢失，同时保持其厚度恒定和均匀，导致层状、圆柱形和球形囊泡的形态。通过小角X射线散射和透射电子显微镜分析囊泡形态。当rS>>1（仍处于干刷标准）时，SI和HS发生宏观相分离，在HS基质中形成由交替片层组成的SI域。
Self-assembled structures in solvent-cast films of binary mixtures of poly(styrene-block-isoprene) (SI) and homo-polystyrenes (HS) were studied as a function of rs, the ratio of molecular weights of HS and polystyrene block (PS) in SI and of wHS, the weight fraction of HS. For rS >1), or to be solubilized into the PS microdomains without swelling PS or without a significant change of a degree of swelling with wHS, if any, (at rS≌1). In the latter case, HS does not significantly affect the lamellar domains of PI for the particular SI studied here, which by itself gives alternating lamellar microdomains of PS and PI, but increases the mean distance between them. AS wHS1, the long-range spatial order of the PI lamellae is lost, while keeping their thicknesses constant and uniform, resulting in morphologies of lamellar, cylindrical, and spherical vesicles. The vesicular morphology was analyzed by small-angle X-ray scattering and transmission electron microscopy. At rS>>1 (still in the criterion of dry brush), SI and HS undergo macrophase separation, forming SI domains composed of alternating lamellae in the matrix of HS.