Influence of polyurethane-based polycarbonate diols with different structures induced via polymer processing on their dielectric properties

Chunarrom, Wannida; Manuspiya, Hathaikarn

doi:10.1007/s10854-020-03803-y

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Then, the relaxation time, τ, will be estimated as follows τ 0 = 1 2 π f true( false( false( ε normals − 0.25em ε ′ false) 2 + 0.25em ε ″ 2 false) false( false( ε ′ − 0.25em ε ∞ false) 2 + 0.25em ε ″ 2 false) true) 1 / 2 ( 1 − α ) , 0 ≤ α ≤ 1 …”

Section: Resultsmentioning

confidence: 99%

Nano-Silver-Coated Porous Clay Heterostructure Fillers for PLA and Biaxially Oriented Poly(lactic acid) Dielectric Films

Khankhuean

Sukthavorn

Nootsuwan

et al. 2023

ACS Appl. Polym. Mater.

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In this work, poly(lactic acid) (PLA) and nano-silver-coated porous clay heterostructure (PCH) hybrid films were successfully fabricated by a twin-screw extruder. Because of the low dielectric constant of PLA, nano-silver and PCH were employed to enhance the dielectric properties of PLA, and nano-silver-coated porous clay heterostructures (Ag/PCH) with different concentrations of Ag were synthesized by the green process using ascorbic acid as a reducing agent. The results revealed that 1 wt % of Ag-coated PCH (Ag/PCH1) exhibited the highest dielectric constant of up to 40. The physical, chemical, thermal, mechanical, and dielectric properties of pristine PLA and hybrid films were studied. The results indicated that adding Ag/PCH fillers could enhance the dielectric properties of hybrid films, increasing the dielectric constant almost 10 times higher than that of PLA. In addition, Ag/PCH could reinforce the mechanical properties of PLA. Furthermore, we prepared biaxially oriented poly(lactic acid) (BOPLA) films with 4 μm of thickness. The dissipation factor of BOPLA-Ag/PCH was improved, while the dielectric constant was only slightly decreased. However, the BOPLA-Ag/PCH showed better dielectric properties than those of traditional BOPP films. As a result, PLA-Ag/PCH and BOPLA-Ag/PCH hybrid films derived from poly(lactic acid) as biodegradable polymers with superior properties can be applied as dielectric films in capacitors.

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Section: Resultsmentioning

confidence: 99%

Nano-Silver-Coated Porous Clay Heterostructure Fillers for PLA and Biaxially Oriented Poly(lactic acid) Dielectric Films

Khankhuean

Sukthavorn

Nootsuwan

et al. 2023

ACS Appl. Polym. Mater.

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“…Furthermore, this urethane incorporates numerous carbonyl and amine groups, which generate dipole moments in both the rigid and the supple segments of the polymer. This attribute favorably impacts the triboelectric properties of PBU by enabling the transfer of electrons between materials in contact, ultimately yielding high output performance . Simultaneously, two-dimensional (2D) Ti 3 C 2 T x MXene has attracted considerable attention due to its extensive surface area, which facilitates a tribonegative surface capable of amassing more charges and augmenting the output performance of the TENG device.…”

Section: Introductionmentioning

confidence: 99%

“…This attribute favorably impacts the triboelectric properties of PBU by enabling the transfer of electrons between materials in contact, ultimately yielding high output performance. 41 Simultaneously, two-dimensional (2D) Ti 3 C 2 T x MXene has attracted considerable attention due to its extensive surface area, which facilitates a tribonegative surface capable of amassing more charges and augmenting the output performance of the TENG device. Additionally, Ti 3 C 2 T x MXene can be seamlessly and securely integrated with fabrics owing to its surface-termination groups (−O, − OH, and − F).…”

Section: ■ Introductionmentioning

confidence: 99%

Self-Repairing and Energy-Harvesting Triboelectric Sensor for Tracking Limb Motion and Identifying Breathing Patterns

Meena

Khanh

Jung

et al. 2023

ACS Appl. Mater. Interfaces

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The increasing prevalence of health problems stemming from sedentary lifestyles and evolving workplace cultures has placed a substantial burden on healthcare systems. Consequently, remote health wearable monitoring systems have emerged as essential tools to track individuals' health and wellbeing. Self-powered triboelectric nanogenerators (TENGs) have exhibited significant potential for use as emerging detection devices capable of recognizing body movements and monitoring breathing patterns. However, several challenges remain to be addressed in order to fulfill the requirements for self-healing ability, air permeability, energy harvesting, and suitable sensing materials. These materials must possess high flexibility, be lightweight, and have excellent triboelectric charging effects in both electropositive and electronegative layers. In this work, we investigated selfhealable electrospun polybutadiene-based urethane (PBU) as a positive triboelectric layer and titanium carbide (Ti 3 C 2 T x ) MXene as a negative triboelectric layer for the fabrication of an energy-harvesting TENG device. PBU consists of maleimide and furfuryl components as well as hydrogen bonds that trigger the Diels−Alder reaction, contributing to its self-healing properties. Moreover, this urethane incorporates a multitude of carbonyl and amine groups, which create dipole moments in both the stiff and the flexible segments of the polymer. This characteristic positively influences the triboelectric qualities of PBU by facilitating electron transfer between contacting materials, ultimately resulting in high output performance. We employed this device for sensing applications to monitor human motion and breathing pattern recognition. The soft and fibrous-structured TENG generates a high and stable opencircuit voltage of up to 30 V and a short-circuit current of 4 μA at an operation frequency of 4.0 Hz, demonstrating remarkable cyclic stability. A significant feature of our TENG is its self-healing ability, which allows for the restoration of its functionality and performance after sustaining damage. This characteristic has been achieved through the utilization of the self-healable PBU fibers, which can be repaired via a simple vapor solvent method. This innovative approach enables the TENG device to maintain optimal performance and continue functioning effectively even after multiple uses. After integration with a rectifier, the TENG can charge various capacitors and power 120 LEDs. Moreover, we employed the TENG as a self-powered active motion sensor, attaching it to the human body to monitor various body movements for energy-harvesting and sensing purposes. Additionally, the device demonstrates the capability to recognize breathing patterns in real time, offering valuable insights into an individual's respiratory health.

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Molecular dynamics research on piperazine‐ and renewable cross‐linker‐based polyurethanes. Dielectric study of relaxation behavior

Potolinca,

Asandulesa,

Oprea

2024

Journal of Polymer Science

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By using broadband dielectric spectroscopy over a wide frequency and temperature range, the effect of the chain extender and cross‐linkers on molecular dynamics of polyurethanes based on piperazine as a heterocyclic compound was assessed. Three relaxations attributed to local motions of polar side groups and small segments of the polyurethane chain (β, γ‐mode) and glass transition (α‐mode) were detected with the increase in temperature from −120 to 100 °C, along with the conductivity process at high temperatures and low frequencies. Experimental data were examined using the impedance and electric modulus for the conductivity study. Due to the presence of dipole polarization of functional groups in the hard segments, cross‐linked polyurethanes are characterized by higher dielectric constant value (≈11 at 1 kHz and 25 °C) compared to the linear ones (≈6–7 at 1 kHz and 25 °C). High conductivity was achieved for the Tween 20‐cross‐linked polyurethanes. The activation energy for the secondary γ relaxation was in the range of 34–37 kJ mol−1 for all polyurethanes, regardless of the chain extender or cross‐linker used. Piperazine‐based polyurethanes had lower activation energies for α relaxation and high conductivity compared to cyclohexane‐based polyurethanes. This indicates that α relaxation is more vulnerable to structural alterations.

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Influence of polyurethane-based polycarbonate diols with different structures induced via polymer processing on their dielectric properties

Cited by 6 publications

References 21 publications

Nano-Silver-Coated Porous Clay Heterostructure Fillers for PLA and Biaxially Oriented Poly(lactic acid) Dielectric Films

Nano-Silver-Coated Porous Clay Heterostructure Fillers for PLA and Biaxially Oriented Poly(lactic acid) Dielectric Films

Self-Repairing and Energy-Harvesting Triboelectric Sensor for Tracking Limb Motion and Identifying Breathing Patterns

Molecular dynamics research on piperazine‐ and renewable cross‐linker‐based polyurethanes. Dielectric study of relaxation behavior

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