Effects of composite reinforcing filler, vulcanizing temperature, and pressure on mechanical properties of gasket material for proton exchange membrane fuel cells

Hou, Qiong; Yin, Li; Xu, Lian; Tan, Jinzhu

doi:10.1002/app.52298

Cited by 6 publications

(3 citation statements)

References 39 publications

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“…In these cases, the number of generated radicals is enough to compensate the temperature effect and overlap it. Hou et al [ 45 ] recently reported the same effect of temperature on the optimum cure time for dicumylperoxide-crosslinked silicone rubber.…”

Section: Resultsmentioning

confidence: 80%

Peroxide-Based Crosslinking of Solid Silicone Rubber, Part I: Insights into the Influence of Dicumylperoxide Concentration on the Curing Kinetics and Thermodynamics Determined by a Rheological Approach

et al. 2022

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Predicting the curing behaviour of industrially employed elastomeric compounds under typical processing conditions in a reliable and scientifically driven way is important for rubber processing simulation routines, such as injection moulding. Herein, a rubber process analyser was employed to study the crosslinking kinetics of solid silicone rubber based on the concentration of dicumylperoxide. A model was proposed to describe the optimal cure time variation with peroxide concentration and temperature, based on the analysis of processing parameters applying kinetic and thermodynamic judgments. Additionally, the conversion rate was described with the aid of a phenomenological model, and the effect of dicumylperoxide concentration on the final crosslink state was investigated using kinetic and thermodynamic explanations. Optimal curing time was affected both by temperature and dicumylperoxide concentration. However, the effects were less pronounced for high temperatures (>170 ∘C) and high concentrations (>0.70 phr). A limit on the crosslink state was detected, meaning that the dicumylperoxide capacity to crosslink the silicone network is restricted by the curing mechanism. Curing restrictions were presumed to be primarily thermodynamic, based on the proton abstraction mechanism that drives the crosslinking reaction. In addition to providing more realistic crosslinking models for rubber injection moulding simulation routines, the results of this study may also explain the chemical behaviour of organic peroxides widely used for silicone crosslinking.

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Section: Resultsmentioning

confidence: 80%

Peroxide-Based Crosslinking of Solid Silicone Rubber, Part I: Insights into the Influence of Dicumylperoxide Concentration on the Curing Kinetics and Thermodynamics Determined by a Rheological Approach

et al. 2022

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“…Therefore, excellent mechanical stability has to be enrolled as one of the prerequisites. 11,12 The operating temperature of fuel cell stacks ranges from À30 to 95 C, and the sealing material must possess good chemical and mechanical resistance under varied temperatures. 13,14 Tan et al, 15,16 Lin et al, 17,18 and Qiu et al 19 studied the performance and durability of state-of-the-art sealants applied in PEMFC, including silicone rubber (SR), ethylene propylene diene monomer (EPDM), fluoro rubber (FR), nitrile rubber (NBR), and copolymeric resin (CR).…”

Section: Introductionmentioning

confidence: 99%

Screening of sealing materials for PEM fuel cell applications based on weight factor method

Yao,

Yang,

et al. 2023

J of Applied Polymer Sci

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The inexpensive, endurable sealing members are among the key components determining the performance and durability of proton exchange membrane fuel cells (PEMFCs). However, there is a lack of effective in situ measurement to monitor the sealing performance change in the fuel cell operation environment. Therefore, the durability of a sealing material should be assessed previously to its application. The present work investigates four types of commercially available sealing silicone rubbers, and five groups of aging tests are carried out to compare their properties and durability in a simulated PEMFC environment, including compression set, stress relaxation, compression stress–strain, solution soaking, and low‐temperature characterization. Furthermore, to comprehensively evaluate the performance of these four types of silicone rubbers and screen out the most suitable one, a comprehensive evaluation table of sealing materials selection based on weight factor was established through an expert survey method, by which the experimental results of all the silicone rubbers can be weighted and scored. This method can be widely used in the fuel cell industry.

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“…In fact, some scholars have studied the preparation process of flexible composites in recent years. [13][14][15] Hou et al 16 investigated the effect of vulcanization temperature and strain on the mechanical properties of silicone rubber materials. It was found that the tensile strength of silicone rubber cloth increased and then decreased with the increase of vulcanization temperature, which also greatly influenced the compressive mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of flexible composites reinforced with high-performance glass fiber multi-axial warp-knitted fabrics

Li,

Zhao,

2023

Journal of Industrial Textiles

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This paper investigates the quasi-static mechanical properties and damage behavior of flexible composites prepared from high-performance glass fiber-based multi-axial warp knitted fabrics as reinforcement and high tenacity environmentally friendly thermoplastic polyurethane as a matrix. The composites were produced by attaching thermoplastic polyurethane (TPU) to the top and bottom of the fabric using a vulcanization machine, followed by hot-pressing for different temperatures and time settings. Moreover, the effects of different preparation processes on the tensile strength, static puncture resistance, and tear strength of flexible composites were investigated in this paper. The results indicated that both hot-pressing temperature and vulcanization time had a significant impact on the mechanical properties of the composites. With an optimum vulcanization temperature of 185°C and a vulcanization time of 10 min, the composite provides optimum tensile strength and puncture resistance. Tear strength is the worst and is related to the reinforcement’s organisational structure and the interfacial bond’s strength. The results of this study are of theoretical and practical significance for applying high-performance multi-axial warp-knitted flexible composites as raw materials in the construction field.

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Effects of composite reinforcing filler, vulcanizing temperature, and pressure on mechanical properties of gasket material for proton exchange membrane fuel cells

Cited by 6 publications

References 39 publications

Peroxide-Based Crosslinking of Solid Silicone Rubber, Part I: Insights into the Influence of Dicumylperoxide Concentration on the Curing Kinetics and Thermodynamics Determined by a Rheological Approach

Peroxide-Based Crosslinking of Solid Silicone Rubber, Part I: Insights into the Influence of Dicumylperoxide Concentration on the Curing Kinetics and Thermodynamics Determined by a Rheological Approach

Screening of sealing materials for PEM fuel cell applications based on weight factor method

Mechanical properties of flexible composites reinforced with high-performance glass fiber multi-axial warp-knitted fabrics

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