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Structural heterogeneity of suspension poly(vinyl chloride) resins
Author(s) -
Krzewki Rudolf J,
Sieglaff Charles L.
Publication year - 1978
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.760181509
Subject(s) - materials science , suspension polymerization , vinyl chloride , epoxy , porosity , particle (ecology) , scanning electron microscope , composite material , silicone , polymerization , chemical engineering , suspension (topology) , particle size , synthetic resin , silicone oil , polymer , copolymer , polymer chemistry , oceanography , mathematics , homotopy , pure mathematics , engineering , geology
Morphology of poly(vinyl chloride) resin particles formed by suspension polymerization was investigated by a combination of several techniques. Significant differences were found in the internal structure of resins obtained under different polymerization conditions. Five main types of resin particles with different porosity and absorptivity were identified by scanning electron microscopy. Three methods were employed to characterize porosity and structural heterogeneity of resin particles: density fractionation of resin particles in mixtures of methanol and carbon tetrachloride; absorption of silicone oil and dioctyl phthalate by resin particles; and examination of fractured particles embedded in epoxy resins. All three methods gave consistent results and can be used for semiquantitative characterization of resin structural heterogeneity. Different particle structure and degree of resin heterogeneity: can profoundly affect compounding and processing operations.