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۱Expansion Characteristics of Expandable Styrene\Methyl Methacrylate Copolymer Beads: The Effects of Molecular Weight and Particle Size Distribution
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
A bead form foamable copolymer was synthesized by suspension polymerization of methyl methacrylate and styrene in the presence of a blowing agent. When the surrounding temperature was high enough to vaporize the blowing agent and soften the polymer shell, the copolymer beads were expanded due to pressure difference across the shell. The accurate investigations of the molecular and morphological properties of the beads showed that the expansion behavior of the expandable beads was dependent on molecular weight of the matrix polymer and particle size of the beads. The findings also suggested that the dimensional stability of the pre–expanded beads could be controlled by the molecular weight modifying aid concentration and copolymer molecular weight.<\div>

۲Expansion Characteristics of Expandable Styrene\Methyl Methacrylate Copolymer Beads: The Effects of Monomer Composition and Cell Modifying Aid
اطلاعات انتشار: کنفرانس بین المللی فرآورش پلیمرها، سال
تعداد صفحات: ۴
Parts cast of metals 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 copolymer particle size and copolymer composition on pentane content of expandable particles were also studied<\div>
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