Effects of Spreading Conditions on the Aggregation Behavior of a Symmetric Diblock Copolymer Polystyrene- block-poly(methyl methacrylate) at the Air/Water Interface

Langmuir : the ACS Journal of Surfaces and Colloids
Mingming GaoLiang Wang

Abstract

Langmuir monolayers and Langmuir-Blodgett (LB) films of a symmetric diblock copolymer polystyrene- block-poly(methyl methacrylate) (PS- b-PMMA) were characterized by the film balance technique and tapping mode atomic force microscopy, respectively. Effects of both the spreading solution concentration and the surface concentration on the aggregation behavior of PS- b-PMMA at the air/water interface and the morphologies of its LB films were studied in detail. When the monolayers spread in different concentrations (≤0.50 mg/mL), all their initial morphologies exhibit tiny circular micelles because of the long hydrophilic PMMA block in the copolymer. The initial tiny circular micelles form spontaneously and then aggregate into small ones upon compression, which can further coalesce into rodlike aggregates or large micelles depending on the spreading concentrations. The LB films of PS- b-PMMA usually exhibit various mixed structures of rodlike aggregates and circular micelles, which can further transform into labyrinth patterns under some special spreading conditions. Besides spreading concentration and volume, we discover that the detailed spreading process should also be responsible for the initial and final morphologies of the LB...Continue Reading

References

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Sep 20, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Robert B Cheyne, Matthew G Moffitt
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Apr 7, 2017·The Journal of Physical Chemistry Letters·Dong Hyup Kim, So Youn Kim

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Citations

Jul 10, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Kun YouShicheng Yang
Sep 26, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Wei XuNanyang Chen

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