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    Fracture surface morphology and phase relationships of polystyrene/poly(methyl methacrylate) systems. I. Low‐molecular‐weight polystyrene in poly(methyl methacrylate)
    Journal of Polymer Science Polymer Physics Edition (1978)
    Raymond R. ParentEdward V. Thompson
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    Abstract:
    Abstract Samples of low‐molecular‐weight polystyrene (PS) in poly(methyl methacrylate) (PMMA) were prepared by first dissolving PS in methyl methacrylate monomer and then polymerizing the monomer. Forty‐three specimens of varying number‐average molecular weight (2100–49,000) and composition (5–40 wt %) of PS were prepared, and the surface morphology and phase relationships studied by scanning electron microscopy. Four distinct types of phase relationships were observed: (i) a single phase consisting of PS dissolved in PMMA; (ii) PS dispersed in PMMA; (iii) PMMA dispersed in PS; and (iv) regions of PS dispersed in PMMA coexisting with regions of PMMA dispersed in PS. Values of the size and population density of the dispersed particles are reported. Finally, the size and distribution of the dispersed particles and the various types of phase relationships are discussed in terms of the ternary polystyrene/poly(methyl methacrylate)/methyl methacrylate phase diagram.
    Keywords:
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    Morphology
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