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Mechanical behavior and structure of single beads of homogeneous and macroporous styrene–divinylbenzene copolymers
Author(s) -
Wieczorek P. P.,
Ilavský M.,
Kolarz B. N.,
Duŝek K.
Publication year - 1982
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.1982.070270129
Subject(s) - copolymer , materials science , divinylbenzene , styrene , penetration (warfare) , swelling , polymer , composite material , modulus , porosity , polymer chemistry , engineering , operations research
The stress–stain and ultimate behavior in compression of homogeneous and macroporous beads of styrene–divinylbenzene copolymers has been investigated in the dry state or in equilibrium with toluene, acetone, methanol, and water. The penetration modulus A indicates sensitively the transition from the glassy into the rubbery state induced by an increase in temperature or swelling. For macroporous copolymers, A of the glassy polymers is mainly determined by the porosity P , while in the rubbery region it primarily depends on the matrix structure (degree of crosslinking and concentration and composition of the diluent). The high value of the slope s of the A vs. P dependence (s ∼ −3) for macroporous copolymers is evidence of the complex deformation mechanism (bucking of pore walls). The relative compression at break, ε b =0.3–0.4, is independent of the composition, and the compressive strength is roughly proportional to the penetration modulus.