Flame retardancy of polypropylene filled with expandable graphite and magnesium hydroxide: The impact of particle size of expandable graphite and its mechanism

Dong, Xiaochen; Yang, Xuefan; Liang, Shitong; Li, Jiaqi; Wang, Kesong; Liu, Jichun; Chang, Haibo

doi:10.1002/vnl.22035

Cited by 7 publications

(1 citation statement)

References 32 publications

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“…[3] . MH is of great interest because it is cheap, stable, and eco-friendly [7] . FA is a fine powder material containing toxic elements such as lead, cobalt, chromium, and vanadium [8] .…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium hydroxide fly ash compounded flame retardant on the properties of polyvinyl chloride

Zhao,

Ma,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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This study investigated the effects of compound flame retardants on polyvinyl chloride (PVC) film. Four F-M/PVC composite film materials (F0.1M0.1/PVC, F0.1M0.2/PVC, F0.1M0.3/PVC, and F0.1M0.4/PVC) were obtained by blending different ratios of fly ash (FA) and magnesium hydroxide (MH(OH)2, MH) compounded flame retardants (F-M) with PVC. The mechanical properties, thermal stability, and smoke density of the composite film materials were examined. The results showed that the loss of mechanical properties of F0.1M0.2/PVC composites was small. TGA analysis showed that the thermal stability of the four F-M/PVC composites was improved. The degradation temperature of pure PVC at T50 was 286.5°C, and that of F0.1M0.2/PVC composites was 335.38°C. Smoke density analysis showed that the maximum smoke density of pure PVC was 6.310, and the maximum smoke density of the composite material (F0.1M0.4/PVC) was reduced to 5.960, which had a better smoke suppression effect. For the comprehensive utilization of Salt Lake magnesium resources, the development of PVC composite film materials to provide the experimental basis has a strong practical value.

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“…[3] . MH is of great interest because it is cheap, stable, and eco-friendly [7] . FA is a fine powder material containing toxic elements such as lead, cobalt, chromium, and vanadium [8] .…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium hydroxide fly ash compounded flame retardant on the properties of polyvinyl chloride

Zhao,

Ma,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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Heat transfer prediction during curing of thick part of unsaturated polyester resin containing nanoparticles of graphene oxide and modified graphene oxide

Yavari,

Bashipour,

Poorabdollah

2023

Polymer Engineering & Sci

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In this study, the challenges of using nanoparticles such as graphene oxide (GO) and modified graphene oxide (MGO) in the production of thick parts were investigated. In addition, using various kinetic models, the trend of temperature increases in pure unsaturated polyester resin (UPR), and UPR containing GO and MGO were investigated. The heat transfer equations were solved using programming code in MATLAB software. In the following, the role of the variation in density, convection heat transfer coefficient, and thermal conductivity coefficient on the prediction of temperature at different points of the parts is evaluated. The findings indicated that the choice of the kinetic model can play an effective role in predicting the temperature in the parts. An increased temperature causes a decrease in the structural regularity of the resin network and intensifies phonon scattering to decrease, and will eventually cause a decrease in the thermal conductivity coefficient.Highlights The mathematical modeling was developed on the curing of unsaturated polyester nanocomposite. The cure kinetic models and thermal properties had important roles in the model accuracy. The best prediction of temperature changes was provided by Vyazovkin's model. The results of developed model satisfactorily matched the experimental data.

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Improving temperature prediction during curing of thick parts of unsaturated polyester resin/reduced graphene oxide composites

Yavari,

Poorabdollah,

Bashipour

2023

Vinyl Additive Technology

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In this study, the challenges of using reduced graphene oxide in the production of thick parts were investigated. The kinetic effects of the particles on the curing reaction rate can cause the parts to fracture during curing because of the increase in internal stresses. In this regard, using various kinetic models, the trend of temperature increase in pure unsaturated polyester resin (Neat UP) and resin containing 0.5 wt% of reduced graphene oxide (UPRGO) were investigated. The heat transfer equation was solved using programming code in MATLAB software, and the results of the modeling were compared with the experimental results. In the following, the role of the variation in density, convection heat transfer, and thermal conductivity on the prediction of temperature at different points in the parts is evaluated. The results showed that the choice of kinetic model could play an effective role in predicting the temperature in the parts. Considering the density variation, changes in the thermal conductivity and convection heat transfer coefficient could play an effective role in matching the experimental and theoretical results. An increase in temperature causes a decrease in the structural regularity of the resin network, intensifies phonon scattering, and decreases in the thermal conductivity coefficient.Highlights The RGO particles have influenced the reaction rate and the temperature gradients of thick parts during curing. The influence of different parameters and kinetics during the curing process of polyester resin was observed on temperature changes. The best prediction of temperature changes was provided by Vyazovkin's model, which had a high accuracy between the experimental and theoretical results. The thermal conductivity coefficient is changed due to the changes in the contribution of the phonon thermal transport. Considering the changes in density with the conversion degree improved the agreement between the experimental and theoretical results.

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Flame retardancy of polypropylene filled with expandable graphite and magnesium hydroxide: The impact of particle size of expandable graphite and its mechanism

Cited by 7 publications

References 32 publications

Effect of magnesium hydroxide fly ash compounded flame retardant on the properties of polyvinyl chloride

Effect of magnesium hydroxide fly ash compounded flame retardant on the properties of polyvinyl chloride

Heat transfer prediction during curing of thick part of unsaturated polyester resin containing nanoparticles of graphene oxide and modified graphene oxide

Improving temperature prediction during curing of thick parts of unsaturated polyester resin/reduced graphene oxide composites

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