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Melt blends of αSAN with a phenoxy
Author(s) -
Kim Byung Kyu,
Choi Chi Hoon
Publication year - 1996
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.10544
Subject(s) - materials science , differential scanning calorimetry , glass transition , dynamic mechanical analysis , scanning electron microscope , composite material , rheology , micrograph , ultimate tensile strength , phase (matter) , viscosity , dynamic modulus , polymer , thermodynamics , organic chemistry , chemistry , physics
Melt blends of poly(α‐methyl styrene‐co‐acrylonitrile) (αSAN) with a phenoxy were prepared using a Brabender Plasticorder. Morphological, thermal, rheological, and mechanical properties of the blends were studied. DSC (differential scanning calorimetry) measurements showed two T g (glass transition temperature) of the blends. T g of αSAN decreased by 5 to 7°C, whereas that of phenoxy increased slightly. Melt viscosity measured using an RDS (Rheometrics dynamic spectrometer) showed a small negative and relatively large positive deviation in αSAN‐ and phenoxy‐rich blends, respectively. Transverse views of SEM (scanning electron microscopy) micrographs of the fractured surfaces again showed two phases, regardless of composition. Traces of full‐out upon fracture were seen in αSAN‐rich but not in phenoxy‐rich blends, indicating stronger interfacial adhesion in phenoxy‐rich blends. Longitudinal views of the SEM micrographs showed highly elongated structure of disperse phases (30 to 70% of phenoxy), especially when phenoxy forms dispersed phase, resulting in finer and well developed phenoxy fibrils. Tensile modulus and strengths showed a negative deviation in αSAN and positive deviation (strength) or additivity (modulus) in phenoxy‐rich blends.