Interfacial rheology and aggregation behaviour of amphiphilic CBABC-type pentablock copolymers at the air–water interface: effects of block ratio and chain length

Li, Chi Kong; Ma, Xiaoyan; Zang, Duyang; Guan, Xinghua; Zhu, Lin; Liu, Jinshu; Chen, Fang

doi:10.1039/c5ra08109b

Cited by 8 publications

(5 citation statements)

References 68 publications

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“…The effects of the rigid and soft parts on the behavior of core–shell structured microgels at the oil/water interface are significant and intriguing. Langmuir trough is an effective technique for measuring mechanical property of surface active materials − at the air/liquid and liquid/liquid interfaces . Very recently, the compression of microgels with inorganic core and soft shell at oil/water interface has been investigated, and the effect of shell thickness on the microstructure of a microgel at interface during compression has been unveiled …”

Section: Introductionmentioning

confidence: 99%

Deformation and Stability of Core–Shell Microgels at Oil/Water Interface

Gong

Zhang

2017

Ind. Eng. Chem. Res.

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This paper investigates the behavior of P(NIPAM-co-AAc)@PTFMA core−shell microgels at the decane/water interface. The microgels were deposited at the interface to form a monolayer film, and the film's compression behavior was measured using Langmuir trough. Typical compression isotherm embodies four regimes, weak interaction between microgels in regime I, viscoelastic deformation in regime II, elastic deformation of microgels with thin shell while still viscoelastic deformation with thick shell in regime III. Minor desorption of microgels takes place in regime III and massive in regime IV. The critical interfacial pressure for desorption of microgels is identified in the range of 43−45 mN/m, independent of the shell thickness. It shows that the deformability of the surrounding part rather than the mean deformation of the microgels dominates their stability at the interface. These results illustrate the behavior of microgels at the interface under loading, and deepen the understanding of the stability of microgel-stabilized emulsion.

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Section: Introductionmentioning

confidence: 99%

Deformation and Stability of Core–Shell Microgels at Oil/Water Interface

Gong

Zhang

2017

Ind. Eng. Chem. Res.

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“…The investigation of interfacial rheology is applied to understand the viscoelastic properties, which provide the modulus and relaxation behaviour [190] and to gain information about the structure-rheology interplay. The two-dimensional properties for a variety of systems like synthetic (co)polymers [115,191,192], mixed protein layers [193], biomolecules [45,194,195] and low molecular weight molecules [196] have been performed. However, investigations on pure protein layers and their interaction with water-soluble molecules are still challenging.…”

Section: Discussionmentioning

confidence: 99%

Evaluating polymeric biomaterial–environment interfaces by Langmuir monolayer techniques

Schöne

Roch

Schulz

et al. 2017

J. R. Soc. Interface.

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Polymeric biomaterials are of specific relevance in medical and pharmaceutical applications due to their wide range of tailorable properties and functionalities. The knowledge about interactions of biomaterials with their biological environment is of crucial importance for developing highly sophisticated medical devices. To achieve optimal performance, a description at the molecular level is required to gain better understanding about the surface of synthetic materials for tailoring their properties. This is still challenging and requires the comprehensive characterization of morphological structures, polymer chain arrangements and degradation behaviour. The review discusses selected aspects for evaluating polymeric biomaterial-environment interfaces by Langmuir monolayer methods as powerful techniques for studying interfacial properties, such as morphological and degradation processes. The combination of spectroscopic, microscopic and scattering methods with the Langmuir techniques adapted to polymers can substantially improve the understanding of their behaviour.

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“…Topological structures have been proven effective in determining the air−water interfacial behavior of many polymeric materials. 1 Topologically interesting macromolecules exhibit a more unique self-assembling morphology 2,3 and distinctive interfacial properties, 4,5 compared to their linear alternatives. One of the most commonly used approaches for interfacial studies, the Langmuir−Blodgett (LB) film technique, renders well-controlled dynamic studies and enables the efficient transfer of well-ordered monolayers to solid substrates.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Topological structures have been proven effective in determining the air–water interfacial behavior of many polymeric materials . Topologically interesting macromolecules exhibit a more unique self-assembling morphology , and distinctive interfacial properties, , compared to their linear alternatives. One of the most commonly used approaches for interfacial studies, the Langmuir–Blodgett (LB) film technique, renders well-controlled dynamic studies and enables the efficient transfer of well-ordered monolayers to solid substrates. − A wide range of techniques, including atomic force microscopy (AFM), transmission electron microscopy (TEM), Brewster angle microscopy (BAM), − and X-ray diffraction (XRD), can be used in tandem with LB to investigate the self-assembly behavior and crystallinity of polymers with different topological structures.…”

Section: Introductionmentioning

confidence: 99%

On the Interfacial Behavior of Catenated Poly(l-lactide) at the Air–Water Interface

et al. 2022

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Interfacial properties of polymeric materials are significantly influenced by their architectural structures and spatial features, while such a study of topologically interesting macromolecules is rarely reported. In this work, we reported, for the first time, the interfacial behavior of catenated poly(L-lactide) (C-PLA) at the air−water interface and compared it with its linear analogue (L-PLA). The isotherms of surface pressure−area per repeating unit showed significant interfacial behavioral differences between the two polymers with different topologies. Isobaric creep experiments and compression−expansion cycles also showed that C-PLA demonstrated higher stability at the air−water interface. Interestingly, when the films at different surface pressures were transferred via the Langmuir−Blodgett method, successive atomic force microscopy imaging displayed distinct nanomorphologies, in which the surface of C-PLA exhibited nanofibrous structures, while that of the L-PLA revealed a smoother topology with less fiber-like structures.

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Interfacial rheology and aggregation behaviour of amphiphilic CBABC-type pentablock copolymers at the air–water interface: effects of block ratio and chain length

Abstract: The interfacial rheology, aggregation behaviour and packing model of the structure evolution of three amphiphilic CBABC-type pentablock copolymers were investigated at the air–water interface.

Cited by 8 publications

References 68 publications

Deformation and Stability of Core–Shell Microgels at Oil/Water Interface

Deformation and Stability of Core–Shell Microgels at Oil/Water Interface

Evaluating polymeric biomaterial–environment interfaces by Langmuir monolayer techniques

On the Interfacial Behavior of Catenated Poly(l-lactide) at the Air–Water Interface

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