Melt rheology of poly(vinylidene fluoride) (PVDF)/low density polyethylene (LDPE) blends
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- 作者：Mosab Kaseem ; Kotiba Hamad ; Hae Woong Yang ; Yong Hwan Lee…
- 刊名：Polymer Science Series A
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：57
- 期：2
- 页码：233-238
- 全文大小：210 KB
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- 刊物主题：Chemistry
Polymer Sciences
Russian Library of Science - 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1555-6107
文摘
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 η 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 B increases linearly with increasing true shear stress τ, 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.