Enhanced Thermal Actuation in Thin Polymer Films Through Particle Nano‐Squeezing by Carbon Nanotube Belts

Worajittiphon, Patnarin; Jurewicz, Izabela; King, Alice A. K.; Keddie, Joseph L.; Dalton, Alan B.

doi:10.1002/adma.201003145

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…A recent study of Dalton et al 41 has found that such an effect can be seen in the case of carbon nanotube (CNT) composites. In this paper, a composites of carbon nanotubes and gel latex particles and deposited onto a silicon substrate, as seen in Fig.…”

Section: Thermally Responsive Systemsmentioning

confidence: 97%

Reconfigurable and actuating structures from soft materials

Geryak

Tsukruk

2014

Soft Matter

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The recent interest in reconfigurable soft materials may lead to the next paradigm in the development of adaptive and actuating materials and structures. Actuating soft materials eventually can be precisely designed to show stimuli-sensing, multi-length scale actuation, tunable transport, programmed shape control and multifunctional orthogonal responses. Herein, we discuss the various advances in the emerging field of reconfigurable soft materials with a focus on the various parameters that can be modulated to control a complex system behavior. In particular, we detail approaches that use either long-range fields (i.e. electrical, magnetic) or changes in local thermodynamic parameters (e.g., solvent quality) in order to elicit a precise dimensional and controlled response. The theoretical underpinnings and practical considerations for different approaches are briefly presented alongside several illustrative examples from the recent studies. In the end, we summarize recent accomplishments, critical issues to consider, and give perspectives on the developments of this exciting research field.

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Section: Thermally Responsive Systemsmentioning

confidence: 97%

Reconfigurable and actuating structures from soft materials

Geryak

Tsukruk

2014

Soft Matter

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“…CLTE is reduced traditionally by adding inorganic fillers with low thermal expansion, such as calcium carbonate, talc, and glass fiber . Dalton et al . showed that incorporating carbon nanotube ropes in a colloidal polymer film yielded a belt‐like polymer.…”

Section: Introductionmentioning

confidence: 99%

“…CLTE is reduced traditionally by adding inorganic fillers with low thermal expansion, such as calcium carbonate, talc, and glass fiber. [3][4][5][6][7] Dalton et al 8 showed that incorporating carbon nanotube ropes in a colloidal polymer film yielded a belt-like polymer. The nanotube network hindered the expansion in the plane of the film and forced an increased expansion in the out-of-plane direction.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Zhang

et al. 2016

J of Applied Polymer Sci

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Fine regulation of the microstructure of rubber/polypropylene (PP) alloys could remarkably reduce the coefficient of linear thermal expansion (CLTE) while retaining the mechanical properties similar to those of thermoplastic elastomers. Rubber/PP elastomers with different morphologies were successfully prepared by controlling the appropriate rubber type, viscosity ratio, and processing method. The CLTE of the polymer alloy parallel to the microlayer directions was considerably reduced when the rubber domains were deformed into microlayers and co‐continuous with plastic domains. The thickness of the PP layers played a crucial role on CLTE reduction. The CLTE considerably decreased with reduced thickness of the PP layer. The sample with a co‐continuous microlayer structure exhibited good flexibility, high elongation, low hardness, and permanent deformation. Thus, low‐thermal‐expansion elastomer materials may have wide applications. Stress relaxation and strain recovery of the ethylene–propylene–diene terpolymer/PP (70/30 wt %) blend were investigated to further clarify the influence of co‐continuous microlayer structure on mechanical properties. Anisotropic mechanical properties were consistent with the morphology. Results of the stress relaxation behavior test would provide further support to the mechanism of the low thermal expansion of blends with co‐continuous microlayer structure. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43902.

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“…A value of α = 7.3 × 10 -4 K -1 was obtained, which agrees with the literature value 10 of 7.0 × 10 -4 K -1 . (Note that if thermal expansion is restricted in the plane of the film, one would expect to see a higher expansivity in the direction normal to the plane 13 . Thus, in this materials system, there is no evidence that an attraction between the polymer and substrate is preventing slippage of the polymer along the substrate).…”

Section: Solvent Lossmentioning

confidence: 99%

Some insights into the structural relaxation of spin-cast, glassy polymer thin films

García

Keddie

Sferrazza

2010

Polym J

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The widespread use of thin films in a range of applications and industries, from coatings, inks and lithography to nano-imprinting, optoelectronics, and memory devices 1 , has made the understanding of thin films, particularly the changes induced by structural relaxation and solvent evaporation, very important. There is a need to know if a film will change in dimensions after its deposition and how fast these changes will occur. Physical ageing of thin polymer systems is, more generally, an important phenomenon in polymer physics: when a polymer is cooled quickly below its glass transition temperature (T g ) at which point freezing of the matrix takes place 2 , it is in a non-equilibrium state. When it is aged at temperatures below T g , a structural relaxation towards the equilibrium volume can take place 2 3 . (The equilibrium volume represents the volume obtained through infinitely slow cooling.) Recent works have shown that the structure, wetting, and mobility of polymers in thin films can differ greatly from those of the bulk 3 4 5 . For example, a well-documented property of thin polymer films that exhibits thickness dependence is its T g 6 7 .In many applications, thin films are prepared by depositing a dilute solution of polymer onto a substrate; then the substrate is spun at high velocity during which the solution spreads, thereby ejecting any excess off the substrate 8 . Subsequently during this process, as * Corresponding author: msferraz@ulb.ac.be

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Enhanced Thermal Actuation in Thin Polymer Films Through Particle Nano‐Squeezing by Carbon Nanotube Belts

Cited by 7 publications

References 26 publications

Reconfigurable and actuating structures from soft materials

Reconfigurable and actuating structures from soft materials

Thermoplastic rubber/PP elastomers toward extremely low thermal expansion

Some insights into the structural relaxation of spin-cast, glassy polymer thin films

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