Dynamic Viscoelastic Behavior and Phase Morphology of HIPS/HDPE Blends

Article Chinese OPEN
LIU Jing-ru ; XIA Yang-yang ; GAO Li-qun ; YU Qiang (2017)
  • Publisher: Journal of Materials Engineering
  • Journal: Journal of Materials Engineering (issn: 1001-4381, eissn: 1001-4381)
  • Related identifiers: doi: 10.11868/j.issn.1001-4381.2015.001194
  • Subject: high impact polystyrene (HIPS) | high density polyethylene (HDPE) | blend | dynamic viscoelastic behavior | phase morphology | compatibilizer | Materials of engineering and construction. Mechanics of materials | TA401-492

The dynamic viscoelastic behavior and phase morphology of high impact polystyrene (HIPS)/high density polyethylene (HDPE) blends were investigated by dynamic rheological test and scanning electron microscopy (SEM). The compatibilizing effect of 1%(mass fraction, same as below) micron-CaCO<sub>3</sub> and nano-CaCO<sub>3</sub> on HIPS/HDPE(30/70) immiscible blend was compared. The results indicate that the complex viscosity and storage modulus of HIPS/HDPE blends at low frequencies show positive deviation from the mixing rule when HDPE is less than 30%, while negative deviation is observed when HDPE is more than 30%. The former is related to the interaction between HDPE and PB particles and the latter is attributed to the poor interfacial interaction between HDPE matrix and PS particles. When HIPS is the matrix phase, HDPE particles display broad size distribution. When HDPE acts as a matrix phase, PS dispersed phase exhibits bimodal size distribution corresponding to the presence of two different types of PS dispersed particles. 1% nano-CaCO<sub>3</sub> has a certain compatibilizing effect on HIPS/HDPE(30/70) immiscible blend, which is mainly located at HIPS/HDPE interface and in the HDPE matrix, while micron-CaCO<sub>3</sub> acts as viscosifier rather than compatibilizer, which is confined in the HDPE matrix.
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