Enhancement on Thermal and Mechanical Properties of Insulating Paper Cellulose Modified by Silane Coupling Agent Grafted hBN

Xiao, Peng; Qin, Jian; huang, Dong; Zeng, Zhenglin; Tang, Chao

doi:10.1002/mame.202200424

Cited by 13 publications

(9 citation statements)

References 34 publications

(52 reference statements)

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“…The amorphous region of cellulose selected for this paper belongs to the glassy state, and the mutation from the glassy state to the highly elastic state occurs as the temperature increases, and this abrupt change point temperature is also the glass transition temperature 32 . In this paper, the glass transition temperature of each model is measured by specific volume‐temperature curve method 31 . The model is continuously warmed up from 303 K to 703 K by molecular dynamics to obtain an image of the change in model specific volume versus temperature, and the mutation point can be found by curve fitting on this image, and this mutation point is the glass transition temperature, and the results are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…The glass transition temperature is the temperature corresponding to the point of abrupt change in the physical properties such as mechanical, thermodynamic, electromagnetic, deformation, and optical properties of the polymer. 31 The amorphous region of cellulose selected for this paper belongs to the glassy state, and the mutation from the glassy state to the highly elastic state occurs as the temperature increases, and this abrupt change point temperature is also the glass transition temperature. 32 In this paper, the glass transition temperature of each model is measured by specific volume-temperature curve method.…”

Section: Glass Transition Temperaturementioning

confidence: 99%

“…32 In this paper, the glass transition temperature of each model is measured by specific volume-temperature curve method. 31 The model is continuously warmed up from 303 K to 703 K by molecular dynamics to obtain an image of the change in model specific volume versus temperature, and the mutation point can be found by curve fitting on this image, and this mutation point is the glass transition temperature, and the results are shown in Figure 4.…”

Section: Glass Transition Temperaturementioning

confidence: 99%

See 2 more Smart Citations

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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Section: Resultsmentioning

confidence: 99%

Section: Glass Transition Temperaturementioning

confidence: 99%

Section: Glass Transition Temperaturementioning

confidence: 99%

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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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“…The mechanical properties can be characterized by the stress–strain curve and mechanical parameters such as the elastic modulus ( E ), the bulk modulus ( K ), and the shear modulus ( G ). According to the Hooke's law, applying stresses along the model x – x , y – y , z – z , x – y , y – z , and z – x directions, respectively, the model will generate the corresponding strains, and the stress–strain relationship meets the following equation [ 44 ]

[\begin{matrix} σ_{1} \\ σ_{2} \\ σ_{3} \\ σ_{4} \\ σ_{5} \\ σ_{6} \end{matrix}] = [\begin{matrix} \begin{matrix} \begin{matrix} \begin{matrix} \begin{matrix} \begin{matrix} C_{11} \\ C_{21} \\ C_{31} \\ C_{41} \\ C_{51} \\ C_{61} \end{matrix} & \begin{matrix} C_{12} \\ C_{22} \\ C_{32} \\ C_{42} \\ C_{52} \\ C_{62} \end{matrix} \end{matrix} & \begin{matrix} C_{13} \\ C_{23} \\ C_{33} \\ C_{43} \\ C_{53} \\ C_{63} \end{matrix} \end{matrix} & \begin{matrix} C_{14} \\ C_{24} \\ C_{34} \\ C_{44} \\ C_{54} \\ C_{64} \end{matrix} \end{matrix} & \begin{matrix} C_{15} \\ C_{25} \\ C_{35} \\ C_{45} \\ C_{55} \\ C_{65} \end{matrix} \end{matrix} & \begin{matrix} C_{16} \\ C_{26} \\ C_{36} \\ C_{46} \\ C_{56} \\ C_{66} \end{matrix} \end{matrix}] \cdot [\begin{matrix} ε_{1} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…The FVF is a ratio of free volume (

V_{\text{f}}

) to total volume (

V_{\text{t}}

) in the model. [ 19,44,46 ] The free volume theory suggests that the total volume of the polymer materials is composed of free volume and occupied volume (

V_{\text{o}}

). The FVF can be expressed as

\text{FVF} = \frac{V_{\text{f}}}{V_{\text{f}} + V_{\text{o}}}

…”

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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Preparation and Characterization of Cellulose Nanocrystal‐Doped Cellulose Triacetate Optical Films by Sol‐Gel Process

Zhou,

Tang,

Zhang

et al. 2024

ChemistrySelect

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A bio‐based nanocomposite optical film was obtained through a simple sol‐gel process and solution casting. The dispersion effect of cellulose nanocrystals (CNCs) gel and the optical properties, mechanical performance and thermal stability of CNC‐doped cellulose triacetate (TAC) films (TAC−X) were systematically evaluated. The results show that CNCs can be well dispersed in hydrophobic organic solvents and TAC matrices through the sol‐gel process. TAC−X film has excellent optical properties, its light transmittance is above 92 %, its haze value and birefringence are low, ranging from 0.21±0.01 % to 0.38±0.02 %, and (1.64±0.26)×10−6 to (2.49±0.50)×10−6 respectively. When doped with 2 wt % CNCs, the tensile strength and Young's modulus of the TAC‐2 film were 33.0 % and 30.1 % higher than those of the pure TAC film, separately. At the same time, the TAC−X film also maintains good thermal stability, with its glass transition temperature and maximum decomposition temperature falling between 215–216 °C and 366–368 °C respectively. The simple sol‐gel process provides a convenient and efficient way to use CNCs doping to enhance the physical and mechanical properties of TAC optical films.

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Enhancement on Thermal and Mechanical Properties of Insulating Paper Cellulose Modified by Silane Coupling Agent Grafted hBN

Cited by 13 publications

References 34 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

Preparation and Characterization of Cellulose Nanocrystal‐Doped Cellulose Triacetate Optical Films by Sol‐Gel Process

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