The flow activation energy of aqueous solutions of poly(2-hydroxyethyl methacrylate) and poly(acrylamide)

1977 ◽  
Vol 42 (2) ◽  
pp. 456-463 ◽  
Author(s):  
P. Bradna ◽  
O. Quadrat
Keyword(s):  
Activation Energy ◽  
Aqueous Solutions ◽  
Hydroxyethyl Methacrylate ◽  
Flow Activation Energy ◽  
Flow Activation ◽  
Poly Acrylamide

Rheological Study on of PBT with High Melt Flow Index

2012 ◽  
Vol 487 ◽  
pp. 644-648
Author(s):  
Yuan Liu ◽  
Lin Wang ◽  
Qing Yan Xu ◽  
Pei Jie Lin ◽  
Zhi Hong Guo ◽  
...  
Keyword(s):  
Activation Energy ◽  
Shear Rate ◽  
Apparent Viscosity ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow ◽  
Flow Activation Energy ◽  
Nonwoven Fabrics ◽  
Flow Activation ◽  
High Flexibility

Melt-blown generated PBT nonwoven fabrics usually have small fibril diameter, high flexibility, well heat and oil resistance. Therefore, they would have promising application such as vehicle filtering media. The rheological behavior of PBT with High Melt Flow Index for Melt-blown is investigated in this paper. It is a direction of the technology design and fabrication parameters .The relation of apparent viscosity and shear rate is analyzed, as well as flow activation energy and Non-Newtonian indexes. The results suggest that PBT with High Melt Flow Index is Non-Newtonian fluid. Apparent viscosity and flow activation energy show gradually decrease with increasing shear rate, exhibiting typical shear-thinning behavior.

Rheological Behaviors of Graphene Oxide/Polyacrylonitrile Spinning Solutions

2017 ◽  
Vol 898 ◽  
pp. 2187-2196 ◽  
Author(s):  
Feng Mei Li ◽  
Ying Ying Zheng ◽  
Biao Wang
Keyword(s):  
Activation Energy ◽  
Graphene Oxide ◽  
Loss Factor ◽  
Viscosity Index ◽  
Structural Viscosity ◽  
Mechanical Loss ◽  
Flow Activation Energy ◽  
Rheological Behaviors ◽  
Flow Activation ◽  
Mechanical Loss Factor

The rheological behaviors of polyacrylonitrile (PAN) in NaSCN aqueous solutions containing different amount of Graphene oxide (GO) were investigated through both steady-state and dynamic rheological measurements. The parameters such as apparent viscosity (ηα), flow activation energy (Eη), structural viscosity index (Δη), storage modulus (G’), loss modulus (G’’) and mechanical loss factor (tanδ) were measured to illustrate the rheological behaviors of these solutions. The results showed that the apparent viscosity decreased with adding appropriate amount of GO, while the structural viscosity index, the flow activation energy and the mechanical loss factor of GO/PAN spinning solutions increased. Accordingly, a possible mechanism of GO effect on rheological behaviors of PAN solution was proposed in this work.

Thermal Oligomerisation of Cardanol

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Francisco Helder A. Rodrigues ◽  
José Roberto R. Souza ◽  
Francisco Célio F. França ◽  
Nágila M. P. S. Ricardo ◽  
Judith P. A. Feitosa
Keyword(s):  
Activation Energy ◽  
Double Bond ◽  
Average Molecular Weight ◽  
Hydrocarbon Chain ◽  
Relative Mass ◽  
Cashew Nut Shell Liquid ◽  
Flow Activation Energy ◽  
H Nmr ◽  
Cashew Nut ◽  
Flow Activation

AbstractCardanol was extracted from technical Cashew Nut Shell Liquid (CNSL), a naturally occurring meta-substituted long chain phenol and oligomerized by heating at 140 °C. Products were characterized by rheology, infrared and 1H NMR spectroscopy and thermogravimetric analysis (TGA). Increase in viscosity and the flow activation energy was found with increasing time of heating. The relative absorbance of double bond of the hydrocarbon chain decreased with time of heating and indicated that the oligomerization is taking place through the unsaturation of the side chain. Decrease in internal double bond as well as in vinyl bond, observed by 1H NMR, pointed out to the participation of these two kinds of unsaturation as well as monoene, diene and triene. The oligomerization is a slow process. With 40 h of heating, the average molecular weight increases only by 46%. Great differences were found in TGA curves of cardanol with different times of oligomerization. Thermal stability increases with time of heating. The degree of oligomerization could be determined from relative mass loss of the first event of TG, or from flow activation energy.

Explaining the abnormally high flow activation energy of thermoplastic polyurethanes

Polymer ◽  
2003 ◽  
Vol 44 (11) ◽  
pp. 3309-3318 ◽  
Author(s):  
Qi-Wei Lu ◽  
Maria E. Hernandez-Hernandez ◽  
Christopher W. Macosko
Keyword(s):  
Activation Energy ◽  
High Flow ◽  
Flow Activation Energy ◽  
Thermoplastic Polyurethanes ◽  
Flow Activation
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