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首页> 外文期刊>RSC Advances >Aggregation behavior of the blends of PS-b-PEO-b-PS and PS-b-PMMA at the air/water interface
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Aggregation behavior of the blends of PS-b-PEO-b-PS and PS-b-PMMA at the air/water interface

机译：PS-b-PEO-b-PS和PS-b-PMMA混合物在空气/水界面的聚集行为

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摘要

In order to explore the aggregation mechanisms of mixed polymeric Langmuir monolayers and enrich the structures of their corresponding Langmuir-Blodgett (LB) films, a predominantly hydrophilic triblock copolymer polystyrene-block-poly(ethylene oxide)-block-polystyrene (SEOS69K, M-n = 69 000, 43.5 wt% PEO) was mixed with an amphiphilic diblock copolymer polystyrene-block-poly(methyl methacrylate) (SMMA34K, M-n = 33 500, 26.9 wt% PMMA). The Langmuir monolayers and LB films of SEOS69K, SMMA34K, and their blends were characterized by the Langmuir monolayer technique and tapping mode atomic force microscopy (AFM), respectively. The isotherms of the samples deviate to large areas with the increase of the SEOS69K content and exhibit pseudo-plateaus for the samples with above 80 wt% SEOS69K. The hysteresis degree of the mixed Langmuir monolayer with 80 wt% SEOS69K compressed up to 30 mN m(-1) is significantly larger than that with 20 wt% SEOS69K, which can be interpreted by a reasonable schematic illustration combining the predominant PEO and the few PEO/PMMA chain entanglements in the former with the low mobility of PEO and PMMA blocks. The mixed LB films with 10 wt% SEOS69K transferred at different pressures exhibit mixed structures of circular micelles and rod-like aggregates. However, all the other mixed LB films only exhibit circular micelles composed of PS cores and mixed PEO/PMMA coronas. Upon compression, the large close-packed aggregates split into small ones with more uniform sizes, which shows that the addition of SEOS69K can really improve the structure homogeneity of the mixed LB films. Moreover, a very simple formula was deduced to transform the isotherm of a mixed Langmuir monolayer as a function of a certain copolymer molecule area or repeating unit area.
机译：为了探索混合的聚合物Langmuir单层的聚集机理并丰富其相应Langmuir-Blodgett（LB）膜的结构，主要采用亲水性三嵌段共聚物聚苯乙烯-嵌段-聚（环氧乙烷）-嵌段-聚苯乙烯（SEOS69K，Mn =将69 000，43.5 wt％的PEO与两亲性二嵌段共聚物聚苯乙烯-嵌段-聚（甲基丙烯酸甲酯）（SMMA34K，Mn = 33 500，26.9 wt％的PMMA）混合。 SEOS69K，SMMA34K及其混合物的Langmuir单层膜和LB膜分别通过Langmuir单层技术和敲击模式原子力显微镜（AFM）进行了表征。随着SEOS69K含量的增加，样品的等温线会偏向大面积，对于SEOS69K含量大于80％的样品，其等温线表现出假高原。 80重量％SEOS69K压缩到30 mN m（-1）的混合Langmuir单层的滞后度显着大于20重量％SEOS69K的混合Langmuir单层的滞后度，这可以通过结合主要PEO和少量PEO的合理示意图来解释前者中PEO / PMMA链缠结，而PEO和PMMA嵌段的迁移率低。具有在不同压力下转移的10 wt％SEOS69K的混合LB膜显示出圆形胶束和棒状聚集体的混合结构。但是，所有其他混合LB膜仅表现出由PS核和PEO / PMMA混合电晕组成的圆形胶束。压缩后，大的紧密堆积的聚集体分裂成尺寸更均匀的小聚集体，这表明添加SEOS69K确实可以改善混合LB膜的结构均匀性。此外，推导了一个非常简单的公式，可将混合的Langmuir单层的等温线转换为某个共聚物分子面积或重复单元面积的函数。

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