Experimental determination of interface widths in binary polymer blends from free volume measurements

Polymer ◽  
2012 ◽  
Vol 53 (20) ◽  
pp. 4539-4546 ◽  
Author(s):  
P. Ramya ◽  
C. Ranganathaiah ◽  
J.F. Williams
Keyword(s):  
Polymer Blends ◽  
Experimental Determination ◽  
Free Volume ◽  
Binary Polymer ◽  
Volume Measurements

Interfacial stabilization of binary polymer blends through radiation treatment: A free volume approach

2009 ◽  
Vol 6 (11) ◽  
pp. 2404-2406 ◽  
Author(s):  
J. M. Raj ◽  
G. N. Kumaraswamy ◽  
C. Ranganathaiah
Keyword(s):  
Polymer Blends ◽  
Free Volume ◽  
Radiation Treatment ◽  
Binary Polymer

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.

A new insight into interfaces of immiscible binary polymer blends from the free volume approach

2012 ◽  
Author(s):  
P. Ramya ◽  
D. Meghala ◽  
T. Pasang ◽  
J. M. Raj ◽  
M. N. Chandrashekara ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Free Volume ◽  
Binary Polymer ◽  
Insight Into

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.

A quantitative image analysis method for the determination of cocontinuity in polymer blends

1993 ◽  
Vol 51 ◽  
pp. 894-895
Author(s):  
William A. Heeschen
Keyword(s):  
Image Analysis ◽  
Polymer Blends ◽  
Quantitative Measurement ◽  
Morphological Evolution ◽  
Phase Ratio ◽  
Irregular Shapes ◽  
Quantitative Image ◽  
Discrete Domains ◽  
A Domains

Two new morphological measurements based on digital image analysis, CoContinuity and CoContinuity Balance, have been developed and implemented for quantitative measurement of morphology in polymer blends. The morphology of polymer blends varies with phase ratio, composition and processing. A typical morphological evolution for increasing phase ratio of polymer A to polymer B starts with discrete domains of A in a matrix of B (A/B < 1), moves through a cocontinuous distribution of A and B (A/B ≈ 1) and finishes with discrete domains of B in a matrix of A (A/B > 1). For low phase ratios, A is often seen as solid convex particles embedded in the continuous B phase. As the ratio increases, A domains begin to evolve into irregular shapes, though still recognizable as separate domains. Further increase in the phase ratio leads to A domains which extend into and surround the B phase while the B phase simultaneously extends into and surrounds the A phase.

Experimental determination of a state equation for dissipative granular gases

1999 ◽  
Vol 96 (6) ◽  
pp. 1111-1116 ◽  
Author(s):  
E. Falcon ◽  
S. Fauve ◽  
C. Laroche
Keyword(s):  
Experimental Determination ◽  
State Equation ◽  
Granular Gases
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