Effective Parameters on Reaction Kinetics and Particle Size in the Suspension Polymerization of Styrene in the Presence of Graphite

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NASIRI MORTEZA; ABBASI FARHANG; Harasi Naser

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Journal: Iranian Journal of Polymer Science and Technology Year:2020 | Volume:33 | Issue:2 Page(s): 137-146

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Title

Effective Parameters on Reaction Kinetics and Particle Size in the Suspension Polymerization of Styrene in the Presence of Graphite

Author(s)

NASIRI MORTEZA | ABBASI FARHANG | Harasi Naser | Issue Writer Certificate

Keywords

expandable polystyreneQ2

graphiteQ2

thermal insulationQ1

in-situ polymerizationQ1

reaction kineticsQ1

Abstract

Hypothesis: suspension polymerization of styrene in the presence of graphite was carried out. The polymerization reaction kinetics was investigated to gain better insight into manipulating process parameters. The particle size distribution and thermal conductivity of the foams were studied by considering different parameters. Methods: Product characterization and the reaction thermal kinetics were evaluated using differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), particle size distribution and thermal conductivity measurements. The effect of graphite and initiator concentration on the reaction kinetics was investigated. Findings: The results showed that the graphite profoundly reduced the rate of reaction and consequently caused instability in the suspension. By manipulating the process variables such as increasing the amount of stabilizers (1 to 2%) and initiator (up to 0. 6% by wt), their frequency and injection time, the polymerization of styrene in the presence of graphite was done. The beads were spherical and the superfine (less than 420 μ m) proportion of the product was less than 5%. Through the preexpansion process, the beads were expanded and the cell structure was uniform. The pentane content of the beads was sufficient (~7% by wt) to successfully sinter the pre-expanded beads in the final molding process. Final foams had 0, 1 and 1. 5% graphite. By increasing the graphite content, the thermal conductivity of the foams was decreased. graphite-containing foams were better thermal insulators than conventional expandable polystyrene. Therefore, for a specific thermal duty, a smaller amount of graphite-containing expandable polystyrene rather than conventional polystyrene is required and consequently, the total cost of the insulation is reduced.

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APA: Copy

NASIRI, MORTEZA, ABBASI, FARHANG, & Harasi, Naser. (2020). Effective Parameters on Reaction Kinetics and Particle Size in the Suspension Polymerization of Styrene in the Presence of Graphite. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 33(2 ), 137-146. SID. https://sid.ir/paper/6743/en

Vancouver: Copy

NASIRI MORTEZA, ABBASI FARHANG, Harasi Naser. Effective Parameters on Reaction Kinetics and Particle Size in the Suspension Polymerization of Styrene in the Presence of Graphite. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)[Internet]. 2020;33(2 ):137-146. Available from: https://sid.ir/paper/6743/en

IEEE: Copy

MORTEZA NASIRI, FARHANG ABBASI, and Naser Harasi, “Effective Parameters on Reaction Kinetics and Particle Size in the Suspension Polymerization of Styrene in the Presence of Graphite,” IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), vol. 33, no. 2 , pp. 137–146, 2020, [Online]. Available: https://sid.ir/paper/6743/en

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