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Expansion of core–shell PS/PMMA particles
Author(s) -
Gonçalves Odinei Hess,
Leimann Fernanda Vitória,
Araújo Pedro Henrique Hermes,
Machado Ricardo Antonio Francisco
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39731
Subject(s) - polystyrene , materials science , shell (structure) , methyl methacrylate , composite material , poly(methyl methacrylate) , particle (ecology) , core (optical fiber) , polymer chemistry , emulsion polymerization , microstructure , polymerization , chemical engineering , polymer , oceanography , geology , engineering
Structured micrometric polystyrene/poly(methyl methacrylate) particles were obtained by suspension polymerization and their expansion behavior was investigated using n ‐pentane as blowing agent. The expanded particles presented two distinct microstructures with an outer region (PMMA‐rich shell) composed by cells of about 10 µm while the center of the particle (PS‐rich core) had much larger cells (50–100 μm). The core–shell particles did not expand at 100°C meaning that the PMMA shell hindered the expansion of the particles. Maximum expansion was dependent on the PMMA concentration and also on the heating temperature and the increase in the PMMA molar mass led to a delay in the onset of the process. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4521–4527, 2013