Morphology, crystallization and rigid amorphous fraction in PDMS adsorbed onto carbon nanotubes and graphite

Klonos, Panagiotis Α.; Sulym, Iryna; Sternik, Dariusz; Konstantinou, Pavlos; Goncharuk, E.V.; Deryło–Marczewska, Anna; Gun'ko, V.М.; Kyritsis, Apostolos; Pissis, P.

doi:10.1016/j.polymer.2018.02.020

Cited by 51 publications

(60 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the CNT layer can form a porous network structure, which allows it to permeate into PDMS viscous liquid during the casting process, followed by high‐temperature curing, forming a close and embedded CNT/PDMS interface (Figure S2b, Supporting Information). Moreover, there are also the CH‐π interactions between the PDMS methyl groups and π‐electron rich surface of the carbon nanotubes 59,60. These can prevent the interface phase separation after a long actuation, which further confirms the mechanical stability of this bimorph structure.…”

Section: Resultsmentioning

confidence: 53%

An Autonomous Soft Actuator with Light‐Driven Self‐Sustained Wavelike Oscillation for Phototactic Self‐Locomotion and Power Generation

Yang

Chang

et al. 2020

Adv Funct Materials

119

View full text Add to dashboard Cite

Mimicking the intelligence of biological organisms in artificial systems to design smart actuators that act autonomously in response to constant environmental stimuli is crucial to the construction of intelligent biomimetic robots and devices, but remains a great challenge. Here, a light-driven autonomous carbon-nanotube-based bimorph actuator is developed through an elaborate structural design. This curled droplet-shaped actuator can be simply driven by constant white light irradiation, self-propelled by a lightmechanical negative feedback loop created by light-driven actuation, time delay in the photothermal response along the actuator, and good elasticity from the curled structure, performing a continuously self-oscillating motion in a wavelike fashion, which mimics the human sit-up motion. Moreover, this autonomous self-oscillating motion can be further tuned by controlling the intensity and direction of the incident light. The autonomous actuator with continuous wavelike oscillating motion shows immense potential in light-driven biomimetic soft robots and optical-energy-harvesting devices. Furthermore, a self-locomotive artificial snake with phototaxis is constructed, which autonomously and continuously crawls toward the light source in a wave-propagating manner under constant light irradiation. This snake can be placed on a substrate made of triboelectric materials to realize continuous electric output when exposed to constant light illumination.

show abstract

Section: Resultsmentioning

confidence: 53%

An Autonomous Soft Actuator with Light‐Driven Self‐Sustained Wavelike Oscillation for Phototactic Self‐Locomotion and Power Generation

Yang

Chang

et al. 2020

Adv Funct Materials

119

View full text Add to dashboard Cite

show abstract

“…In almost all PNCs CF is slightly increased, whereas T c strongly increases, from 110 °C up to 123 °C ( Table 1 ). This increase can be understood in terms of the fillers offering sites for additional crystallization (inset scheme to Figure 5 a) and acting, in this way, as additional crystallization nuclei, as has been found in different [ 7 , 38 , 39 , 55 , 56 , 57 , 58 , 59 ] and similar polymers [ 34 , 36 , 37 ]. In Figure 5 a, the stronger increase in nucleation is recorded in the graphene containing PNCs (P10Gr, P10Gr05S, P10Gr10S), while the effect of silica is significantly more limited (P10S, P10Gr25S).…”

Section: Resultsmentioning

confidence: 72%

Calorimetric and Dielectric Study of Renewable Poly(hexylene 2,5-furan-dicarboxylate)-Based Nanocomposites In Situ Filled with Small Amounts of Graphene Platelets and Silica Nanoparticles

et al. 2020

Self Cite

View full text Add to dashboard Cite

Poly(hexylene 2,5 furan-dicarboxylate) (PHF) is a relatively new biobased polyester prepared from renewable resources, which is targeted for use in food packaging applications, owing to its great mechanical and gas barrier performance. Since both properties are strongly connected to crystallinity, the latter is enhanced here by the in situ introduction in PHF of graphene nanoplatelets and fumed silica nanoparticles, as well as mixtures of both, at low amounts. For this investigation, we employed Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and dielectric spectroscopy (BDS). The fillers were found to improve crystallization in both the rate (increasing Tc) and fraction (CF), which was rationalized via the concept of fillers acting as crystallization agents. This action was found stronger in the case of graphene as compared to silica. BDS allowed the detection of local and segmental dynamics, in particular in PHF for the first time. The glass transition dynamics in both BDS (α relaxation) and DSC (Tg) are mainly dominated by the relatively high CF, whereas in the PHF filled uniquely with silica strong spatial confinement effects due to crystals were revealed. Finally, all samples demonstrated the segmental-like dynamics above Tg, which screens the global chain dynamics (normal mode).

show abstract

“…Similarly, the fraction of the rigid amorphous phase associated with nanoparticles has been identified by Klonos and Pissis in nanocomposites of poly(lactic acid) with silica. A recent work of Klonos et al . on composites of polydimethylsiloxane with carbon nanotubes and micrometric colloidal graphite sheets has demonstrated that the fraction of the rigid amorphous phase formed by interaction with the filler particles is directly proportional to their surface area as determined by the BET method.…”

Section: Rigid Amorphous Phasementioning

confidence: 99%

“Nothing Can Hide Itself from Thy Heat”: Understanding Polymers via Unconventional Applications of Thermal Analysis

Vyazovkin

2018

Macromol. Rapid Commun.

View full text Add to dashboard Cite

This article surveys some exciting possibilities and results offered by less common, yet essential applications of differential scanning calorimetry and thermogravimetric analysis (TGA). The applications are concerned with the most commonly studied processes of the glass transition, crystallization, melting, polymerization, and degradation. Issues related to the glass transition include the non-Arrhenius temperature dependence and fragility, kinetic complexity of physical aging, evaluation of cooperatively rearranging regions, and rigid amorphous fraction. Discussion of crystallization covers separation of heterogeneous and homogeneous nucleation, crystallization controlled by physical aging, and the use of isoconversional methods for determining the Hoffman-Lauritzen parameters. For melting, the role of reorganization and nucleation control is emphasized. For the thermal degradation and polymerization, advanced kinetic treatments as a way of obtaining mechanistic insights are discussed, and the possibility of studying both processes during continuous cooling is stressed. The possibility of using TGA for monitoring polycondensation is also highlighted.

show abstract

Morphology, crystallization and rigid amorphous fraction in PDMS adsorbed onto carbon nanotubes and graphite

Cited by 51 publications

References 86 publications

An Autonomous Soft Actuator with Light‐Driven Self‐Sustained Wavelike Oscillation for Phototactic Self‐Locomotion and Power Generation

An Autonomous Soft Actuator with Light‐Driven Self‐Sustained Wavelike Oscillation for Phototactic Self‐Locomotion and Power Generation

Calorimetric and Dielectric Study of Renewable Poly(hexylene 2,5-furan-dicarboxylate)-Based Nanocomposites In Situ Filled with Small Amounts of Graphene Platelets and Silica Nanoparticles

“Nothing Can Hide Itself from Thy Heat”: Understanding Polymers via Unconventional Applications of Thermal Analysis

Contact Info

Product

Resources

About