Dynamics Gradient of Polymer Chains near a Solid Interface

Nguyen, Hung K.; Sugimoto, Shin-ichiro; Konomi, Asuka; Inutsuka, Manabu; Kawaguchi, Daisuke; Tanaka, Keiji

doi:10.1021/acsmacrolett.9b00351

Cited by 50 publications

(35 citation statements)

References 67 publications

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“…Moreover, the dynamics of the polymer chains close to the particle surface appears to be slowed down by confinement. [12][13][14][15][16][17] Because the mechanical response of these chains is stiffer than that in the bulk, the confined polymer chains form rigid polymer bridges connecting the particles within the sample.…”

Section: Introductionmentioning

confidence: 99%

Role of Glassy Bridges on the Mechanics of Filled Rubbers under Pressure

et al. 2020

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In this study, we address the question of the equivalent role of the pressure and temperature on the mechanical properties of highly filled elastomers. It is well known that in polymer matrixes, the equivalence of temperature and pressure results from free volume variations. Our measurements performed on phenylated polydimethylsiloxane (PDMS) chains filled with silica particles show that a temperature-pressure superposition property is still observed in both linear and nonlinear regimes in these systems. However, the temperature-pressure equivalence involves coefficients that are two orders of magnitude larger than those in non-reinforced matrixes. We suggest that the mechanical response of the filled elastomers is controlled by the shape of the rigid network made by fillers that are connected by rigid polymer bridges. In this frame, we provide quantitative evidence that the macroscopic behavior of reinforced elastomers is controlled by the variation in the degree of the confinement of polymer chains between particle surfaces.

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Section: Introductionmentioning

confidence: 99%

Role of Glassy Bridges on the Mechanics of Filled Rubbers under Pressure

et al. 2020

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“…While the former governs the segmental dynamics and mean square displacement of polymer chains, the latter decides the strength and conformational relaxations of the polymer chains. [38][39][40][41][42][43][44][45][46][47][48][49][50][51] Such a concept is critical to optimize the healing efficiency via interdiffusion of mobile polymer chains across the cut surfaces in addition to the supramolecular networks that exchange the newly formed dangling free groups (within the fracture region), enabling reconstruction. In this article, we outline the latest developments in self-healing polymers and SH-PNCs literature and provide insights into materials design and healing mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Sattar

Patnaik

2020

Chemistry An Asian Journal

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Polymers and polymer nanocomposites (PNCs) are extensively used in daily life. However, the growing requirement of advanced PNCs laid persistent environmental issues due to deformation‐induced damage that once formed, does not vanish at future stages. Therefore, self‐healing materials with significantly enhanced long life and safety have been designed to epitomize the forefront of recent advances in materials chemistry and engineering. Self‐healing PNC (SH‐PNCs) materials are a class of smart composites in which nanoparticles induce interfacial reconstruction via multiple covalent and non‐covalent interactions culminating in improved mechanical strength and self‐healing capability. However, since the filler nanoparticles are independent of the reversible supramolecular network, the filler incorporation destroys the self‐healing ability but could enhance the mechanical strength. Hence, the molecular parameters controlling the alliance of robust mechanical strength with virtuous self‐healing ability is a crucial challenge. Herein, we review the latest developments that have been made in self‐healing materials and puts advancing insights into the fabrication of SH‐PNCs in which the combination of covalent bonds and non‐covalent interactions provides an optimal balance between their mechanical performance and self‐healing capability. We highlight the importance of specific entropic, enthalpic changes, polymer chain conformations and flexibility that enable the reconstruction of damaged surface and physical reshuffling of dynamic bonds at the interface of cut surfaces.

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“…Since the driving force of the chain adsorption is an attractive interaction with the surface, the increase of segments in the trains makes it easier to cover the entropic penalty of the chain 48 . Thus, once a chain is adsorbed onto the surface with many trains, the conformation is kinetically trapped 49 , 50 .…”

Section: Resultsmentioning

confidence: 99%

Direct observation of morphological transition for an adsorbed single polymer chain

Oda

Kawaguchi

Morimitsu

et al. 2020

Sci Rep

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A better understanding of the structure of polymers at solid interfaces is crucial for designing various polymer nano-composite materials from structural materials to nanomaterials for use in industry. To this end, the first step is to obtain information on how synthetic polymer chains adsorb onto a solid surface. We closely followed the trajectory of a single polymer chain on the surface as a function of temperature using atomic force microscopy. Combining the results with a full-atomistic molecular dynamics simulation revealed that the chain became more rigid on the way to reaching a pseudo-equilibrium state, accompanied by a change in its local conformation from mainly loops to trains. This information will be useful for regulating the physical properties of polymers at the interface.

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Dynamics Gradient of Polymer Chains near a Solid Interface

Cited by 50 publications

References 67 publications

Role of Glassy Bridges on the Mechanics of Filled Rubbers under Pressure

Role of Glassy Bridges on the Mechanics of Filled Rubbers under Pressure

Design Principles of Interfacial Dynamic Bonds in Self‐Healing Materials: What are the Parameters?

Direct observation of morphological transition for an adsorbed single polymer chain

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