Thermorheological behavior of coexisting physical networks: combining SAFIN and SAMIN organogels

Soft Matter ◽  
2012 ◽  
Vol 8 (48) ◽  
pp. 12025 ◽  
Author(s):  
Arjun S. Krishnan ◽  
Pruthesh H. Vargantwar ◽  
Richard J. Spontak
Keyword(s):  
Thermorheological Behavior

Thermorheological Behavior of Various Short- and Long-Chain Branched Polyethylenes and Their Correlations with the Molecular Structure

2010 ◽  
Vol 43 (17) ◽  
pp. 7341-7350 ◽  
Author(s):  
Ute Kessner ◽  
Joachim Kaschta ◽  
Florian J. Stadler ◽  
Cécile S. Le Duff ◽  
Xavier Drooghaag ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Thermorheological Behavior ◽  
Long Chain

Applicability of time temperature superposition principle to an immiscible blend of polyphenyleneoxide and polyamide

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Narendra A. Hardikar ◽  
Somasekhar Bobba ◽  
Roshan Jha
Keyword(s):  
Storage Modulus ◽  
Master Curve ◽  
Loss Modulus ◽  
Superposition Principle ◽  
Strict Sense ◽  
Cole Plot ◽  
Temperature Superposition ◽  
Immiscible Blend ◽  
Thermorheological Behavior ◽  
Time Temperature Superposition

Abstract The immiscible blend of polyphenyleneoxide (PPO) and polyamide (PA) is used in several applications exposed to high temperature. The complexity of numerical modeling of such materials is dependent on their thermorheological behavior with significant simplification possibilities, if the material is found to follow the time temperature superposition (TTS) principle and show thermorheological simplicity (TRS). Hence as a precursor to selecting accurate constitutive modeling approach, the paper investigates the applicability of the TTS principle and the nature of thermorheological behavior to the blend. Dynamic mechanical analysis (DMA)frequency scans were performed in the range of 0.1–100 rad/s from 0°C to 210°C at 10°C intervals. Temperature dependency was observed on the Cole-Cole plot pointing to the thermorheological complexity and the need for vertical shift factors. 2-D minimization algorithm was used to shift the isotherms horizontally and vertically to obtain master curves. Except, in the vicinity of glass transition temperature T g , the isotherms overlap to form a master curve, but further analysis considering various conditions indicate that in a strict sense TTS is not applicable to the blend when both storage G′ and loss modulus G″ are considered. However, a continuous master curve of storage modulus spanning 31 decades of time is obtained using horizontal shifting alone when loss modulus is neglected. Further testing is required to ascertain if relaxation modulus can be approximated with storage modulus alone before taking recourse to characterization methods developed for thermorheologically complex (TRC) materials.

Thermorheological behavior analysis of mLLDPE and mVLDPE: Correlation with branching structure

2012 ◽  
Vol 129 (1) ◽  
pp. 458-463 ◽  
Author(s):  
A. K. Dordinejad ◽  
S. H. Jafari ◽  
H. A. Khonakdar ◽  
U. Wagenknecht ◽  
G. Heinrich
Keyword(s):  
Behavior Analysis ◽  
Thermorheological Behavior

The effect of recycled polymer addition on the thermorheological behavior of modified lubricating greases

2012 ◽  
Vol 53 (4) ◽  
pp. 818-826 ◽  
Author(s):  
J.E. Martín-Alfonso ◽  
C. Valencia ◽  
M.C. Sánchez ◽  
J.M. Franco ◽  
C. Gallegos
Keyword(s):  
Polymer Addition ◽  
Thermorheological Behavior ◽  
Recycled Polymer

Optimal Cooling Paths for a Class of Thermorheologically Complex Viscoelastic Materials

1985 ◽  
Vol 52 (3) ◽  
pp. 634-638 ◽  
Author(s):  
B. D. Harper
Keyword(s):  
Residual Stress ◽  
Thermal Stresses ◽  
Optimal Path ◽  
Shift Factor ◽  
Plate Material ◽  
Viscoelastic Materials ◽  
Vertical Shift ◽  
Jump Discontinuities ◽  
Cooling Path ◽  
Thermorheological Behavior

This paper concerns the optimal cooling of thin viscoelastic plates so as to minimize the residual thermal stresses upon completion of the cool-down process. The thermorheological behavior of the plate material is assumed complex in the sense that both horizontal and vertical shift factors are employed. The optimal path is shown to possess initial and final jump discontinuities and to depend on only one of the two components of the vertical shift factor. It is further demonstrated that significant reductions in the level of residual stress may be attained by following the optimal cooling path.

Thermorheological Behavior of Various Long-Chain Branched Polyethylenes

2008 ◽  
Vol 41 (4) ◽  
pp. 1328-1333 ◽  
Author(s):  
Florian J. Stadler ◽  
Joachim Kaschta ◽  
Helmut Münstedt
Keyword(s):  
Thermorheological Behavior ◽  
Long Chain
Sign in / Sign up

Export Citation Format

Share Document