Effect of the Addition of ENR on Foam Properties of EVA/NR/Clay Nanocomposites

Lopattananon, Natinee; Julyanon, Juthapat; Masa, Abdulhakim; Thongnuanchan, Bencha

doi:10.3139/217.3358

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Based on our previous work, it has been well established that the cell density and cell size of 60/40 EVA/NR blend nanocomposite foams showed a strong dependency on the blend miscibility of EVA and NR. 17,31 Since the similarity in phase dispersion of 60/40 EVA/NR blend nanocomposites prepared by DM and PSM methods was obtained in this study (Figure 2), therefore the comparable cell size and density were then obtained. Furthermore, the void fraction and volume expansion ratio of the DM-EVANRSiO 2 and PSM-EVANRSiO 2 foams did not change with mixing method because their cell density and size were in the same order.…”

Section: Resultssupporting

confidence: 52%

Influence of silicon dioxide addition and processing methods on structure, thermal stability and flame retardancy of EVA/NR blend nanocomposite foams

Walong

Thongnuanchan

Sakai

et al. 2020

Progress in Rubber, Plastics and Recycling Technology

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Rubber nanocomposite foams based on 60/40 ethylene vinyl acetate (EVA)/natural rubber (NR) were melt-mixed with flame retardant silicon dioxide (SiO2) (20 parts per hundred rubber, phr), and foamed by compression molding process. In this study, the effect of mixing phenomena of SiO2 through two different compounding techniques such as direct mixing (DM) and phase selective mixing (PSM) methods on structure, thermal stability, combustility and flame retardancy of EVA/NR blend nanocomposite foams were investigated. DM method is a melt mixing of EVA, NR, layered silicate and SiO2, followed by foaming. PSM is a new method based on pre-mixing EVA with SiO2, then melt mixing of EVA/SiO2 masterbatch with NR and layered silicate, and finally foaming. Based on TEM technique, it was found that the SiO2 was exclusively located in dispersed NR phase for the sample prepared by DM method, and the SiO2 was preferably dispersed in continuous EVA matrix when PSM method was employed. However, the different mixing methods did not significantly alter their cellular structures. The thermal stability and char residue content of foamed samples with SiO2 increased obviously when compared with those of corresponding foams without SiO2. The results based on limiting oxygen index (LOI) test and oxygen bomb calorimetry indicated that the foams combined with SiO2 had better combustion resistance and flame retardancy due to barrier effect of thermally stable silicon-based char layer. Further, the SiO2 filled foamed system obtained from the PSM method showed a higher degree of improvement in thermal stability, combustion resistance and flame retardancy than that of DM method because the homogeneous dispersion of SiO2 in EVA matrix rather than the selective dispersion in NR phase. This resulted in the continuity of flame retardant EVA/SiO2 phase in the 60/40 EVA/NR nanocomposite foams, which exerted more efficient fire barrier of the silicon-based char layer.

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Section: Resultssupporting

confidence: 52%

Influence of silicon dioxide addition and processing methods on structure, thermal stability and flame retardancy of EVA/NR blend nanocomposite foams

Walong

Thongnuanchan

Sakai

et al. 2020

Progress in Rubber, Plastics and Recycling Technology

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“…SMR-L, SMR-5, SMR-10 and SMR-20 are the main NR grades and the main impurities are listed in Table 2 . Another important grade is epoxidized natural rubber (ENR) which is a chemically-modified grade of NR obtained via epoxidation [ 104 ]. The presence of epoxy groups on the backbone increases the NR polarity leading to faster curing rate and better final properties of the foams.…”

Section: Rubber Foaming Formulationmentioning

confidence: 99%

Chemistry, Processing, Properties, and Applications of Rubber Foams

Rostami‐Tapeh‐Esmaeil

Vahidifar

Esmizadeh

et al. 2021

Polymers

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With the ever-increasing development in science and technology, as well as social awareness, more requirements are imposed on the production and property of all materials, especially polymeric foams. In particular, rubber foams, compared to thermoplastic foams in general, have higher flexibility, resistance to abrasion, energy absorption capabilities, strength-to-weight ratio and tensile strength leading to their widespread use in several applications such as thermal insulation, energy absorption, pressure sensors, absorbents, etc. To control the rubber foams microstructure leading to excellent physical and mechanical properties, two types of parameters play important roles. The first category is related to formulation including the rubber (type and grade), as well as the type and content of accelerators, fillers, and foaming agents. The second category is associated to processing parameters such as the processing method (injection, extrusion, compression, etc.), as well as different conditions related to foaming (temperature, pressure and number of stage) and curing (temperature, time and precuring time). This review presents the different parameters involved and discusses their effect on the morphological, physical, and mechanical properties of rubber foams. Although several studies have been published on rubber foams, very few papers reviewed the subject and compared the results available. In this review, the most recent works on rubber foams have been collected to provide a general overview on different types of rubber foams from their preparation to their final application. Detailed information on formulation, curing and foaming chemistry, production methods, morphology, properties, and applications is presented and discussed.

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Mechanical Properties, Set and Rebound Resilience Characteristics of Natural Rubber/Ethylene Vinyl Acetate Blend on Various Ratios

Indrajati¹,

Setyorini²

2020

Macromolecular Symposia

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In this study, natural rubber/ethylene vinyl acetate (NR/EVA) blends are formulated by simple blend using two roll mill. The set properties, both compression and tension, are evaluated as a function of NR/EVA ratios. The ratio of NR/EVA ranges from 100/0 to 95/5, 90/10, 85/15, and to 80/20. Compression and tension set are performed on vulcanized rubber samples at ambient and elevated temperature (100 °C) with constant compression or elongation at 25% of initial value. All tests are carried out for 72 h. Air‐circulated oven is used to conduct testing at elevated temperature. Crosslink density before and after testing is also monitored by equilibrium swelling method. Tensile properties and hardness are also measured to support the discussion. The results show that compression and tension set at ambient temperature tend to increase upon the EVA concentration in the formulation. Set properties are independent of EVA concentration at elevated temperature. Incorporation of EVA decreases the rebound resilience property and thermal aging tends to increase it. The rebound resilience ranges from 31% to 40% for original samples, and from 33% to 43% for aged samples.

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Effect of the Addition of ENR on Foam Properties of EVA/NR/Clay Nanocomposites

Cited by 5 publications

References 28 publications

Influence of silicon dioxide addition and processing methods on structure, thermal stability and flame retardancy of EVA/NR blend nanocomposite foams

Influence of silicon dioxide addition and processing methods on structure, thermal stability and flame retardancy of EVA/NR blend nanocomposite foams

Chemistry, Processing, Properties, and Applications of Rubber Foams

Mechanical Properties, Set and Rebound Resilience Characteristics of Natural Rubber/Ethylene Vinyl Acetate Blend on Various Ratios

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