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Photo-polymerization induced viscoelastic phase separation of trimethylolpropane triacrylate/poly (styrene-co-methyl methacrylate) blends. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.03.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Heydarpoor S, Abbasi F, Jalili K, Najafpour M. Synthesis of core-shell PS/PMMA expandable particles via seeded suspension polymerization. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0789-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mehravar E, Abbasi F, Jalili K, Rezaei M, Heydarpoor S. Synthesis and expansion characteristics of expandable styrene/methyl methacrylate copolymer beads: The effects of monomer composition and cell structure modifying aid. J CELL PLAST 2012. [DOI: 10.1177/0021955x11433225] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Parts cast of metals such as iron, using expandable polystyrene foams, may have an unacceptable amount of surface defects, such as lustrous carbon. The use of foams made of styrene/methyl methacrylate copolymers can improve the quality of foam molds and metal parts made using such molds. In this work, expandable copolymers were synthesized by suspension copolymerization of styrene and methyl methacrylate in the presence of blowing agents (pentane isomers). When the surrounding temperature was high enough to vaporize the blowing agent and soften the polymer shell, the beads were expanded. The effects of monomer composition and cell structure modifying aid (polyethylene wax) on the particle size, average molecular weight and molecular weight distribution of synthesized copolymer, pentane content and expansion properties (density, residual pentane of pre-expanded particles and cell structure) were investigated. The results showed that monomer composition had a significant effect on the copolymerization kinetic and the copolymer molecular weight. In addition, cell structure, cell size and cell size distribution of the pre-expanded particles were strongly influenced by cell structure modifying aid concentration. The effects of comonomer composition and copolymer particle size on pentane content of expandable particles were also studied.
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Affiliation(s)
- E Mehravar
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
| | - F Abbasi
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
| | - K Jalili
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
| | - M Rezaei
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
| | - S Heydarpoor
- Institute of Polymeric Materials, Sahand University of Technology, Tabriz, Iran
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Azimi HR, Rezaei M, Abbasi F. The effect of expansion conditions on the batch foaming dynamics of St–MMA copolymer. J CELL PLAST 2011. [DOI: 10.1177/0021955x11432960] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this study, we synthesized styrene–methyl methacrylate copolymer particles by suspension polymerization process to study the foaming dynamics via visual batch foaming apparatus. The weight ratio of styrene–methyl methacrylate was 53–47. The foaming system consisted of a self-sealing observation cell equipped with two glass windows and a stereo microscope attached with a high-speed digital camera as well as a pressure and temperature controller. The required pentane pressure was supplied by heating a small pentane flask. The synthesized copolymer particles impregnated by pentane and then the foaming dynamics were recorded after a rapid pressure release. The effect of different foaming conditions, such as temperature, impregnation time, and impregnation pressure on the expansion ratio of styrene–methyl methacrylate copolymer was investigated. It was concluded that impregnation pressure, time, and temperature have different effects on the foaming ratio at impregnation pressures lower and higher than 4 bar.
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Affiliation(s)
- Hamid Reza Azimi
- Institute of Polymeric Materials, Department of Polymer Engineering, Sahand University of Technology, Tabriz, Iran
| | - Mostafa Rezaei
- Institute of Polymeric Materials, Department of Polymer Engineering, Sahand University of Technology, Tabriz, Iran
| | - Farhang Abbasi
- Institute of Polymeric Materials, Department of Polymer Engineering, Sahand University of Technology, Tabriz, Iran
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Haddadi E, Mehravar E, Abbasi F, Jalili K. Expandable styrene/methyl methacrylate copolymer: Synthesis and determination of VOCs by combined thermogravimetry/differential thermal analysis-gas chromatography/mass spectrometry. J Appl Polym Sci 2011. [DOI: 10.1002/app.35513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kumar M, Kannan T. A novel tertiary bromine-functionalized thermal iniferter for controlled radical polymerization. Polym J 2010. [DOI: 10.1038/pj.2010.92] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abraham S, Choi JH, Lee JK, Ha CS, Kim I. Synthesis of star-like random copolymers from resorcinarene-based octa-functional alkoxyamine initiatorvia nitroxide mediated free radical polymerization. Macromol Res 2007. [DOI: 10.1007/bf03218794] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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