Fabrication of polyrotaxane and graphene nanoplate composites with high thermal conductivities

Iida, Masaki; Gotō, Tetsuo; Mayumi, Koichi; Maeda, Rina; Hatakeyama, Kazuto; Ito, Tsuyohito; Shimizu, Yoshiki; Ito, Kohzo; Hakuta, Yukiya; Terashima, Kazuo

doi:10.1002/pc.26246

Cited by 8 publications

(7 citation statements)

References 35 publications

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“…The PR physical gelation studies Travelet et al (2009 , 2010a , b) have validated a rheological approach to measuring gelation kinetics in PR systems. Among a variety of hydroxyl-reactive cross-linkers, Karino et al (2006) ; Samitsu et al (2006) ; Shinohara et al (2006) ; Ito (2007) HMDI has been reacted with CD-based PRs to give slide-ring gels, Kato et al (2013) adhesives, Dikshit and Bruns (2021) elastomers, Minato et al (2017) nanocomposites, Iida et al (2021) polymer electrodes, Lin et al (2018) and piezoelectric sensors. Seo et al (2021) In our model system, we employ HMDI in DMSO with 0.1% v/v dibutyltin dilaurate (DBTDL) to cross-link ( Scheme 1 ) the α -CD rings of an adamantamine-capped Araki et al (2005) polyrotaxane (PR) based on a PEG backbone of molecular weight (MW) 35,000 Da and an inclusion ratio (proportion of threaded diethylene glycol units in the chain) of ∼30%, corresponding to ∼120 α -CD rings per chain based on NMR signal integration.…”

Section: Resultsmentioning

confidence: 99%

Chemorheological Monitoring of Cross-Linking in Slide-ring Gels Derived From α-cyclodextrin Polyrotaxanes

Dikshit

Bruns

2022

Front. Chem.

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Despite hundreds of studies involving slide-ring gels derived from cyclodextrin (CD)-based polyrotaxanes (PRs), their covalent cross-linking kinetics are not well characterized. We employ chemorheology as a tool to measure the gelation kinetics of a model slide-ring organogel derived from α-cyclodextrin/poly (ethylene glycol) PRs cross-linked with hexamethylenediisocyanate (HMDI) in DMSO. The viscoelastic properties of the gels were monitored in situ by small-amplitude oscillatory shear (SAOS) rheology, enabling us to estimate the activation barrier and rate law for cross-linking while mapping experimental parameters to kinetics and mechanical properties. Gelation time, gel point, and final gel elasticity depend on cross-linker concentration, but polyrotaxane concentration only affects gelation time and elasticity (not gel point), while temperature only affects gelation time and gel point (not final elasticity). These measurements facilitate the rational design of slide-ring networks by simple parameter selection (temperature, cross-linker concentration, PR concentration, reaction time).

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Section: Resultsmentioning

confidence: 99%

Chemorheological Monitoring of Cross-Linking in Slide-ring Gels Derived From α-cyclodextrin Polyrotaxanes

Dikshit

Bruns

2022

Front. Chem.

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“…[23][24][25] On the other hand, composite materials such as polymer alloys and polymer blends, which are obtained by physically or chemically mixing polymers, often show improved strength and elongation properties. [26] Cellulose nanofiber (CNF) [27] and polyrotaxane (p-rtx) [28,29] are functional polymers that have attracted considerable attention in recent years; both materials (as powders) can be combined with a polymer matrix using a simple melt-compounding method. In this study, we investigated the mechanical properties of composite materials containing CNF and p-rtx as fillers in a polypropylene (PP) matrix.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene‐based nanocomposite with improved mechanical properties: Effect of cellulose nanofiber and polyrotaxane with partial miscibility

Harada

Chu

et al. 2023

Polymer Composites

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The mechanical properties and miscibility of polymer‐based composites containing cellulose nanofiber (CNF) and polyrotaxane (p‐rtx) as organic fillers were studied in detail. CNF and p‐rtx were introduced as powders into a polypropylene (PP) matrix, and composites were prepared using a simple melt‐compounding method. The best mechanical properties were achieved when CNF and p‐rtx were loaded at a concentration of 0.6 wt%. The Young's modulus of the composite increased by 760 MPa compared with that of the PP matrix. In addition, the presence of mica in the composite promoted the epitaxial growth of PP along the (1 3 0) plane. The various shifts in the melting/crystallization temperatures of the composites prepared at different CNF:p‐rtx ratios confirmed the partial miscibility between the fillers and the matrix. The enhancement in the mechanical properties of the composite is believed to be due to the miscibility of the surfaces of aggregates of the organic fillers with PP and the uniform dispersion of the organic fillers in the matrix.

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“…Compatible fillers, when used in appropriate concentration can bring significant changes in the sensor's performance. [5][6][7][8] Generally, conductive nanofillers are added to the polymer solution to help establish a conductive network in the polymer so that the change in film conductivity with changing temperature may be traced. However, in certain cases, such as in electrospun films consisting of highly random and mesh-like structures, the conductive pathway may not always get established.…”

Section: Introductionmentioning

confidence: 99%

High‐performance flexible temperature sensor from hybrid nanocomposite for continuous human body temperature monitoring

Phadkule

Sarma

2022

Polymer Composites

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Combining high sensitivity with fast response and high resolution remains a critical challenge for flexible temperature sensors. The present study leverages the intrinsically high surface-to-volume ratio of nanocomposite fibers as well as the high mechanical properties of nanomaterials for achieving conformable temperature sensors with accurate and fast detection of temperature. To achieve this, nanocomposite films of electrospun polyvinylidene fluoride (PVDF) with embedded silver (Ag) nanoparticles were layered with multiwall carbon nanotubes (MWCNT). The sensor showed a negative temperature coefficient (NTC) with excellent sensitivity of À0.18%/ C and a quick response rate of 11 s. The sensor also exhibited low self-heating errors for an activation current of 1 mA and excellent anti-interference ability when tested for bending forces and wet environments. The nanocomposite fiber-based sensor can be used for real-time monitoring of human body temperature as confirmed by successful experiments. The present work lays the foundation for integrating the sensor further with a user interface to create a wearable temperature monitoring system for mobile healthcare.

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Fabrication of polyrotaxane and graphene nanoplate composites with high thermal conductivities

Cited by 8 publications

References 35 publications

Chemorheological Monitoring of Cross-Linking in Slide-ring Gels Derived From α-cyclodextrin Polyrotaxanes

Chemorheological Monitoring of Cross-Linking in Slide-ring Gels Derived From α-cyclodextrin Polyrotaxanes

Polypropylene‐based nanocomposite with improved mechanical properties: Effect of cellulose nanofiber and polyrotaxane with partial miscibility

High‐performance flexible temperature sensor from hybrid nanocomposite for continuous human body temperature monitoring

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