Hydrodynamic interaction in Binary Polymer Blends measured experimentally from Ortho Positronium lifetime

2011 ◽  
Author(s):  
P. Ramya ◽  
J. M. Raj ◽  
C. Ranganathaiah ◽  
Alka B. Garg ◽  
R. Mittal ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Hydrodynamic Interaction ◽  
Binary Polymer ◽  
Positronium Lifetime

An effective tool to characterize adhesion at the interface of binary polymer blends: a free volume study

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Jaya Madhu Raj ◽  
Abdullah Mohammed Ali Mohammed Altaweel ◽  
Malavalli Nagarajaiah Chandrashekara ◽  
Puttegowda Ramya ◽  
Harijan Basavaraju Ravikumar ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Free Volume ◽  
Hydrodynamic Interaction ◽  
Positron Lifetime ◽  
Volume Data ◽  
Hydrogen Bond Formation ◽  
Binary Polymer ◽  
Interfacial Modification ◽  
Microwave Irradiations ◽  
Partially Miscible

Abstract In this work, an effective method of characterizing the adhesion at the interface of partially miscible and immiscible binary polymer is used. Three polymer blends namely PS/PMMA, PP/NBR and PVC/SAN were irradiated with e-beam and microwaves, in order to bring about interfacial modification, and were characterized in terms of free volume measured by Positron Lifetime technique. The changes in free volume parameters upon e-beam and microwave irradiation on the two systems clearly shows improved interaction between the blend constituents as a result of cross-linking through hydrogen bond formation. However, the extent of interfacial modification brought in at different weight compositions is not forthcoming. Therefore, the hydrodynamic interaction parameter α, which accounts for friction at the interface between the dissimilar chains of the blend constituents, is evaluated from the very same free volume data. Since α represents the strength of hydrodynamic interaction, it could be taken as an indicator of the adhesion strength at the interface. Present results showed that both e-beam and microwave irradiations can be used to stabilize the interfaces in binary polymer blends as evidenced by hydrodynamic interaction.

Characterization of interfacial adhesion in binary polymer blends: a new approach based on positron lifetime study

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Chikkakuntappa Ranganathaiah
Keyword(s):  
Polymer Blends ◽  
Free Volume ◽  
Hydrodynamic Interaction ◽  
Positron Lifetime ◽  
Volume Data ◽  
New Approach ◽  
Polar Groups ◽  
Binary Polymer ◽  
Partially Miscible

Abstract A new method of characterizing the adhesion at the interface of partially miscible and immiscible binary polymer blends based on free volume concept is described here. The efficacy of the method is tested in four binary polymer blend systems namely PS/PMMA, PVC/EVA, PP/NBR and PVC/SAN. The usefulness of hydrodynamic interaction is exploited which is derived from free volume data to understand the changes at the interface. We understand that if the adhesion at the interface is good it exhibits large negative values for hydrodynamic interaction parameter α, a measure of excess friction at the interface. The thermal properties (indicated by Tg) also improve for this condition. To show that the method is sensitive to the changes at the interface, we modified the interface through microwave and e-beam irradiation and found from α characterization, that blends with polar groups exhibit interface stabilization for microwave irradiation while e-beam is good for blends with no polar or weak polar groups.

scholarly journals The effects of morphological variation and polymer/polymer interface on the tensile modulus of binary polymer blends: a modeling approach

2020 ◽  
Vol 41 (2) ◽  
pp. 109-118
Author(s):  
Esmail Sharifzadeh ◽  
Yasahr Amiri
Keyword(s):  
Polymer Blends ◽  
Morphological Variation ◽  
Tensile Modulus ◽  
Network System ◽  
Test Results ◽  
Model Accuracy ◽  
Acceptable Accuracy ◽  
Polymer Interface ◽  
Binary Polymer ◽  
Neural Network System

Abstract In this work, the effects of the morphological variation and the polymer/polymer interface on the tensile modulus of binary polymer blends were evaluated using a combined modeling method. The characteristics of the polymer/polymer interface region were evaluated using a neural network system and the results were used to improve the analytical model. The model accuracy was investigated by comparing its predictions with the tensile test results of some prepared iPP/PA blend samples and also some other data from literature which revealed an acceptable accuracy (error < 5%).

Spatial Modulation in Cross-Linked Binary Polymer Blends

Langmuir ◽  
2005 ◽  
Vol 21 (17) ◽  
pp. 7921-7936 ◽  
Author(s):  
Chowdhury K. Mamun
Keyword(s):  
Polymer Blends ◽  
Spatial Modulation ◽  
Binary Polymer
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