Classification of natural rubber foam grades by optimising the azodicarbonamide content

Baru, Fateehah; Saiwari, Sitisaiyidah; Hayeemasae, Nabil

doi:10.1590/0104-1428.20210111

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Hence, cell size plays a crucial role in the compression set test. Conversely, Baru et al 35 suggested that increasing levels of blowing agents, such as ADC, lead to greater porosity and larger cell sizes, consequently increasing the compression set. The addition of blowing agents can reduce the cell wall area per surface, which predominantly controls the elastic response.…”

Section: Resultsmentioning

confidence: 99%

Facial fabrication of self‐healing natural rubber foam based on zinc thiolate ionic networks

Majid,

Rehman,

Mohd Sani

et al. 2024

J of Applied Polymer Sci

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In this work, self‐healing natural rubber (SHNR) foam incorporating an intrinsic zinc thiolate ionic network was successfully prepared. The materials exhibited the ability to autonomously repair damage at room temperature without the need for external triggers. The investigation focused on the effect of sodium bicarbonate, employed as a blowing agent, on the self‐healing performance, as well as the physical and mechanical properties of the foam. Various concentrations of sodium bicarbonate (0, 1, 4, 8, and 10 phr) were employed. The conventional two‐roller mill was used for mixing and compounding, while compression molding was utilized for the vulcanization process. With increasing sodium bicarbonate concentration, the density, tensile strength, elongation at break, and compression set of the self‐healing NR foam were found to decreased. Conversely, the porosity, shrinkage, compressive strength, and water uptake of the SHNR foam increased as the concentration of sodium bicarbonate increased. Scanning electron microscopy analysis revealed that the optimal concentration of sodium bicarbonate (8 phr) resulted in smaller, finer, and more uniform porous structures. The self‐healing rubber foam incorporating 8 phr sodium bicarbonate exhibited improved properties in terms of tensile modulus, elongation at break, and tear strength, with healing efficiencies of 91.27%, 69.39%, and 83.99%, respectively.

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Section: Resultsmentioning

confidence: 99%

Facial fabrication of self‐healing natural rubber foam based on zinc thiolate ionic networks

Majid,

Rehman,

Mohd Sani

et al. 2024

J of Applied Polymer Sci

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“…Treated distillate aromatics extract (TDAE oil) was used as processing oil. Processing oil can help to reduce the viscosity and facilitate the diffusion of gas [ 15 ]. TDAE oil was purchased from H&R ChemPharm (Thailand) Co., Ltd. Calcium carbonate (CaCO 3 ) was obtained from Krungthepchemi Co., Ltd., Bangkok, Thailand.…”

Section: Methodsmentioning

confidence: 99%

Potent Application of Scrap from the Modified Natural Rubber Production as Oil Absorbent

et al. 2022

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The production of raw natural rubber always ends up with leftover latex. This latex is later collected to produce low grades of rubber. The collection of this latex also depends on the latex’s quality. However, reproducing the latex may not be applicable if the latex contains many specks of dirt which will eventually be discarded. In this work, an alternative solution was to utilize such rubber in a processable form. This scrap rubber (SR) from the production of natural rubber grafted with polymethyl methacrylate (NR-g-PMMA) production was recovered to prepare an oil-swellable rubber. The rubber blends were turned into cellular structures to increase the oil swellability. To find the suitable formulation and cellular structure of the foam, the foams were prepared by blending SR with virgin natural rubber (NR) at various ratios, namely 0/100, 20/80, 30/70, 50/50, 70/30, 80/20, and 100/0 (phr/phr). The foam formation strongly depended on the SR, as it prevented gas penetration throughout the matrix. Consequently, small cells and thick cell walls were observed. This structure reduced the oil swellability from 7.09 g/g to 5.02 g/g. However, it is interesting to highlight that the thermal stability of the foam increased over the addition of SR, which is likely due to the higher thermal stability of the NR-g-PMMA waste or SR. In summary, the blending NR with 30 phr of SR provided good oil swellability, processability, and morphology, which benefit oil recovery application. The results obtained from this study will be used for further experiments on the enhancement of oil absorbency by applying other key factors. This work is considered a good initiative for preparing the oil-absorbent material based on scrap from modified natural rubber production.

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Classification of natural rubber foam grades by optimising the azodicarbonamide content

Cited by 2 publications

References 24 publications

Facial fabrication of self‐healing natural rubber foam based on zinc thiolate ionic networks

Facial fabrication of self‐healing natural rubber foam based on zinc thiolate ionic networks

Potent Application of Scrap from the Modified Natural Rubber Production as Oil Absorbent

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