Preparation and thermal‐mechanical property evaluation of cellulose insulation paper with differing nano‐SiC contents

Zhang, Yiyi; Xu, Chuqi; Wei, Wenchang; Deng, Yuke; Nie, Shuai; Zha, Jun‐Wei

doi:10.1049/hve2.12271

Cited by 13 publications

(5 citation statements)

References 30 publications

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“…Changes in temperature can easily cause changes in MSD, so exploring the effect of temperature changes on the MSD of insulating paper is also of reference significance for the study of thermal stability. The definition of MSD 34 is shown as

MSD = ⟨{|r_{i} (t) - r_{i} (0)|}^{2}⟩

where

r_{i} (t)

is the position of

i

molecule or atom at time

t

, and

r_{i} (0)

represents the position of molecule or atom at time 0.…”

Section: Resultsmentioning

confidence: 99%

Molecular simulation on the mechanical and thermal properties of modified insulating paper cellulose doped with trapezoidal polyphenylsesquisiloxane at different temperature

Zeng,

Su,

Wang

et al. 2023

J of Applied Polymer Sci

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With the further development of the transmission and distribution network, the requirements for the insulating system of power equipment are further deepened. As one of the important factors, insulating paper is of great value to improve its performance. The pure cellulose model and trapezoidal polyphenylsesquisiloxane (T‐PPSQ) composite model are established to analyze the mechanical and thermal properties of insulating paper cellulose. The effects of T‐PPSQ doping at different temperature on properties of cellulose are investigated by comparing the radial distribution function, mechanical parameters, glass transition temperature, mean square displacement (MSD), and free volume fraction (FVF) through molecular dynamics method. The results show that T‐PPSQ can improve the ability of cellulose to resist shear stress at different temperatures, showing good mechanical properties. When the temperature is 423 K, the mechanical performance parameters elastic modulus, bulk modulus and shear modulus can be increased by 47.2%, 18.2%, and 38.56% at most. The glass transition temperature of the insulating paper cellulose with T‐PPSQ increases by 64 K, the MSD and the FVF all decrease at different temperature which demonstrated it has improved thermal stability. The research in this paper is of great significance for improving the life of the insulating system of power equipment.

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MSD = ⟨{|r_{i} (t) - r_{i} (0)|}^{2}⟩

where

r_{i} (t)

is the position of

i

molecule or atom at time

t

, and

r_{i} (0)

represents the position of molecule or atom at time 0.…”

Section: Resultsmentioning

confidence: 99%

Molecular simulation on the mechanical and thermal properties of modified insulating paper cellulose doped with trapezoidal polyphenylsesquisiloxane at different temperature

Zeng,

Su,

Wang

et al. 2023

J of Applied Polymer Sci

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show abstract

“…The MSD [ 45 ] is expressed as the average of the offset between the positions of all particles in the system and their initial positions at a certain moment, and the value of the MSD can characterize the intensity of the motion of each molecular chain in the system. The MSD can be calculated as

$$\text{MSD} = \langle \left(\left|\right.

…”

Section: Resultsmentioning

confidence: 99%

Ladderlike Polyphenylsesquioxane‐Doped Cellulose Insulation Paper with Upgraded Mechanical Strength

Zeng

Wang

et al. 2023

Adv Eng Mater

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Ladderlike polyphenylsesquioxane (L‐PPSQ) with special planar ladder structure is significant to upgrade the mechanical strength of cellulose insulation paper. In this study, the effect of different content of L‐PPSQ on mechanical properties and dielectric properties of cellulose is first investigated by molecular simulation, and then insulation paper doped with L‐PPSQ is prepared for experimental verification. It is indicated in the simulation results that the elastic modulus, bulk modulus, and shear modulus of the cellulose are enhanced up to 36.82%, 27.96%, and 41.80%, respectively, when L‐PPSQ is added at 3 wt%, and the cellulose model with 3 wt% L‐PPSQ possesses the lowest dielectric constant. The reason is that L‐PPSQ can enhance the hydrogen bonding network of cellulose, weaken the degree of molecular chain motion, and strengthen the strength of molecular chains, which in turn manifests as the enhancement of mechanical strength. It is shown in the experimental results that the tensile strength and elongation at break of the composite insulation paper can be enhanced by 16.7% and 35.09% when the L‐PPSQ content is 3 wt%, which is consistent with the simulation results. The short‐term aging test shows that L‐PPSQ can also upgrade the mechanical strength of the insulation paper at high temperatures.

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“…During ageing test, samples are taken from 0, 2, 5, 10, 20, 30, and 45 days respectively [29], and the corresponding insulating oil samples are taken with a needle tube. After wiping the oil stains on the surface, the extracted insulating paper samples shall be subject to contact angle test, mechanical property test (reference standard: GB/T 12914‐2018), breakdown voltage test [30] (reference standard: IEC 60156), and dielectric property test [31] (reference standard: IEC 60247), and the extracted insulating oil samples shall be subject to water and acid content test [32] (reference standard: IEC 60814, IEC 62021).…”

Section: Methodsmentioning

confidence: 99%

A new type of lipophilic hydrophobic self‐repairing cellulose insulating paper developed with ST‐110/FAS/PTFE ternary system as coating substrate

Zeng,

Qin,

Wang

et al. 2023

High Voltage

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The moisture generated by the ageing of the oil‐paper insulating system can easily lead to the deterioration of the performance of the insulating paper. In order to alleviate the impact of moisture on the performance of the insulating paper, we developed a kind of lipophilic hydrophobic self‐repairing cellulose insulating paper (new insulating paper) based on the ternary system of polytetrafluoroethylene, fluorocarbon surfactant and fluorinated alkyl silane, and accelerated thermal ageing test for 45 days at 130°C was carried out. The experimental results show that the new insulating paper with excellent lipophilic property can realise hydrophobic self‐repairing through heat treatment after physical damage. The tensile strength and elongation at break of the new insulating paper increased by 5%–8% and 6.25%–27% respectively compared with the original cellulose insulating paper. At the end of ageing, the relative dielectric constant and dielectric loss factor of new insulating paper are 10.4% and 9.9% lower than that of the original cellulose insulating paper, while the breakdown voltage is 6.8% higher. The acid and moisture content produced during the ageing process of the insulating oil impregnated with new insulating paper are also less, indicating that the coating can delay the ageing of the insulating paper.

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Preparation and thermal‐mechanical property evaluation of cellulose insulation paper with differing nano‐SiC contents

Cited by 13 publications

References 30 publications

Molecular simulation on the mechanical and thermal properties of modified insulating paper cellulose doped with trapezoidal polyphenylsesquisiloxane at different temperature

Molecular simulation on the mechanical and thermal properties of modified insulating paper cellulose doped with trapezoidal polyphenylsesquisiloxane at different temperature

Ladderlike Polyphenylsesquioxane‐Doped Cellulose Insulation Paper with Upgraded Mechanical Strength

A new type of lipophilic hydrophobic self‐repairing cellulose insulating paper developed with ST‐110/FAS/PTFE ternary system as coating substrate

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