Effect of Hydrothermic Ageing on Dielectric and Mechanical Properties of Rigid Poly(vinyl chloride)

Djidjelli, Hocine; Kaci, Mustapha; Sadoun, Tahar; Benachour, Djafer; Farenc, J.; Martinez‐Vega, Juan

doi:10.1002/1439-2054(20010701)286:7<407::aid-mame407>3.0.co;2-f

Cited by 10 publications

(10 citation statements)

References 4 publications

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“…In contrast, at temperatures above T g , the reduced constraints on the dipoles, due to increased free volume, lead to a large increase in dielectric constant. For example, polyvinyl chloride (PVC), a simple polymer glass, exhibits a large increase in dielectric constant after undergoing its glass transition, from K~3 below T g to K>9 above T g [14,15]. The penalty is that the dielectric loss also becomes high at temperatures above T g (loss > 5%) due to cooperative segmental motions in the rubbery state, which have long relaxation times.…”

Section: Resultsmentioning

confidence: 99%

Generating high dielectric constant blends from lower dielectric constant dipolar polymers using nanostructure engineering

et al. 2017

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It is a great challenge in dielectric polymers to achieve a high dielectric constant while maintaining low dielectric loss and high operating temperatures. Here we report that by blending two glassy state dipolar polymers i.e., poly(arylene ether urea) (PEEU, K = 4.7) and an aromatic polythiourea (ArPTU, K = 4.4) to form a nanomixture, the resulting blend exhibits a very high dielectric constant, K = 7.5, while maintaining low dielectric loss (< 1%). The experimental and computer simulation results demonstrate that blending these dissimilar dipolar polymers causes a slight increase in the interchain spacing of the blend in its glassy state, thus reducing the barriers

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Section: Resultsmentioning

confidence: 99%

Generating high dielectric constant blends from lower dielectric constant dipolar polymers using nanostructure engineering

et al. 2017

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“…[ 19 ] In terms of increasing the dielectric constant, increasing the free volume is a very effective way to increase the dielectric constant. [ 20–22 ] In addition, to the dielectric constant, thermal stability is also a very important factor for high‐temperature capacitors. Take polyetherimide (PEI) as an example, it is a highly temperature resistor, and is a high‐performance material of current interest, which has a relatively low U e due to the low permittivity.…”

Section: Methodsmentioning

confidence: 99%

Rational Design of Soluble Polyaramid for High‐Efficiency Energy Storage Dielectric Materials at Elevated Temperatures

Seery

et al. 2020

Macro Materials & Eng

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High‐temperature polymer dielectrics are in great demand for harsh‐environment applications. Maintaining high‐energy storage density and low loss at elevated temperatures remains a major challenge for polymer dielectrics. In this work, a new type of polymer dielectric material is designed, which exhibits comparable dielectric properties in the start‐of‐the‐art dielectric nanocomposites and a superior potential for scale up. A soluble, glassy state polymer with a polarizing group is designed by introducing a weakly polar group into the polyaramid (PA) backbone to dilute the hydrogen bonding of the PA parent species. This increases the mobility of the molecular dipole within the polymer in the glassy state, thereby increasing its dielectric constant while maintaining the high‐temperature performance. The result of this design is a polymer with a glass transition temperature of 251 °C, a dielectric constant of up to 4.5, and a dielectric loss of 1%, while maintaining 2.1 J cm−3 energy density and 86.8% efficiency at 200 °C. This polymer, with its excellent, intrinsic, electrical‐energy‐storage properties can also be adapted for a roll‐to‐roll capacitor film production. Breaking intermolecular hydrogen bonds to enhance the electrical‐energy‐storage properties of polymers is an excellent path for designing polymer dielectrics with high‐temperature capabilities.

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“…This increase, slight in the temperature range of -100 to 0 8C, becomes important between 50 and 120 8C. [32] Effect on the Dielectric Losses Figure 11 shows an increase in dielectric losses as the wood flour content is increased. The increase in permittivity as the temperature is raised can be explained by the resulting increase in mobility of polar groups and a decrease in density, which allows the orientation of such groups.…”

Section: Effect Of Wood Flour On the Dielectric Properties Of Pvcmentioning

confidence: 95%

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Djidjelli¹,

Martinez‐Vega

Farenc

et al. 2002

Macromol. Mater. Eng.

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Effect of Hydrothermic Ageing on Dielectric and Mechanical Properties of Rigid Poly(vinyl chloride)

Cited by 10 publications

References 4 publications

Generating high dielectric constant blends from lower dielectric constant dipolar polymers using nanostructure engineering

Generating high dielectric constant blends from lower dielectric constant dipolar polymers using nanostructure engineering

Rational Design of Soluble Polyaramid for High‐Efficiency Energy Storage Dielectric Materials at Elevated Temperatures

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