Melt rheology of poly(vinylidene fluoride) (PVDF)/low density polyethylene (LDPE) blends

Title
Melt rheology of poly(vinylidene fluoride) (PVDF)/low density polyethylene (LDPE) blends
Author(s)
고영건양해웅이용환파와즈데리[파와즈데리]모삽알카심코티바하마드
Keywords
MECHANICAL-PROPERTIES; PA6/LDPE BLENDS; STARCH BLENDS; COMPATIBILIZER; MORPHOLOGY; BEHAVIOR; IONOMER
Issue Date
201503
Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
Citation
POLYMER SCIENCE SERIES A, v.57, no.2, pp.233 - 238
Abstract
The aim of this work is to study the rheological properties of PVDF/LDPE blends in the molten state, in relation to shear rate, shear stress and temperature. Blends of LDPE and PVDF at different compositions, namely PVDF/LDPE = 0/100, 30/70, 50/50, 70/30, 100/0 were realized. The blends were prepared by using brabender plastograph and measurements were carried out by using capillary rheometer. For studying the viscous properties non-Newtonian index n, true viscosity eta and the flow activation energy E were determined. The melt elasticity has been studied in term of die swell ratio B. The results show that PVDF/LDPE blends behave in pseudo-plastic manner (n < 1), plots of true viscosity versus blending ratio go through a minimum nearly at blending ratio (50/50), and the flow activation energy decreases with increasing shear rate at the wall gamma but it increases with increasing true shear stress tau. The results of die swell ratio show that, B increases linearly with increasing true shear stress tau, while B decreases with increasing L/R. It was also found that a maximum of elastic properties is observed at certain blending ratio. This phenomenon can be attributed to the amount of elastic deformation energy stored in the melt flow and its transition due to the viscoelastic difference between the two phases.
URI
http://hdl.handle.net/YU.REPOSITORY/33184http://dx.doi.org/10.1134/S0965545X15020054
ISSN
0965-545X
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공과대학 > 신소재공학부 > Articles
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