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Model filled polymers. XV: The effects of chemical interactions and matrix molecular weight on rheology
Author(s) -
Agarwal Shishir,
Salovey Ronald
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760351507
Subject(s) - materials science , methyl methacrylate , composite material , rheology , polymer , ethylene glycol dimethacrylate , particle (ecology) , polystyrene , matrix (chemical analysis) , viscosity , dispersion (optics) , chemical engineering , polymer chemistry , copolymer , methacrylic acid , oceanography , physics , engineering , geology , optics
In order to explore the effects of chemical composition on the rheological behavior o filled polymeric systems, we prepared polystyrene (9PS) and poly(methyl methacrylate) (PMMA) particles crosslinked with either ethylene glycol dimethacrylate (EGDMA) or divinyl benzene (DVB), and mixed these particles in a PMMA matrix. PS particles crosslinked with 10% EGDMA are better dispersed in a PMMA matrix, compared to PS particles, crosslinked with 10% DVB, due to the compatibilizing effect of EGDMA. For PMMA particles crosslinked with DVB, particle‐matrix interactions in a PMMA matrix are smaller than in EGDMA‐PMMA filled PMMA. Therefore, particles tend to agglomerate in PMMA composites filled with DVB‐PMMA particles, especially in a low molecular weight matrix. We compared PMMA matrices of molecular weights 35,000 and 75,000. Higher particle‐matrix interaction in the higher molecular weight matrix resulted in lower relative viscosities for DVB‐PS filled systems, due to better dispersion of the particles. Composites filled with EGDMA‐PS particles behave similarly to those filled with DVB‐PS particles. PMMA composites filled with DVB‐PMMA particles have a lower relative viscosity in the higher molecular weight PMMA matrix at low shear rates, due to better dispersion in the higher molecular weight matrix. However at high shear rates, particles are well dispersed in both PMMA matrices and, then, the relative viscosity is higher due to better bonding in the higher molecular weight matrix.