Sadhan De - Academia.edu (original) (raw)
Papers by Sadhan De
Journal of Materials Science, 1990
Polymers and Polymer Composites
The thermorheological behaviour of thermoplastic elastomeric blends based on both ground rubber t... more The thermorheological behaviour of thermoplastic elastomeric blends based on both ground rubber tyre (GRT) and maleic anhydride grafted GRT (m-GRT) has been studied. The blend composition based on m-GRT exhibits a higher melt viscosity than the corresponding control blend based on GRT. The former exhibits lower die swell and less melt fracture at low shear rates than the latter, when extruded at 180°C through a capillary rheometer. At high shear rates, however, both the blends exhibit melt fracture. There is apparently some interaction between m-GRT and the matrix, which is evident from dynamic mechanical analysis. The m-GRT causes a significant lowering in tanδ at temperatures higher than the Tg of the blend.
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry
The Journal of Physical Chemistry
... Mosk. Univ. Ser. 11, Khim., 17, No. 5, 14 (1962). (4) H. M. Rosenstock, JR Walton, and L. K. ... more ... Mosk. Univ. Ser. 11, Khim., 17, No. 5, 14 (1962). (4) H. M. Rosenstock, JR Walton, and L. K. Brice, US Atomic Energy Commission Report ORNL-2772 (1959). (5) G. Blue, JW Green, R. G. Bautista, and JL Margrave, J. Phys. Chem., 67, 877 (1963). ...
Rubber Chemistry and Technology
A blend of Poly(vinyl chloride) (PVC) and hydrogenated acrylonitrile—butadiene rubber (HNBR) unde... more A blend of Poly(vinyl chloride) (PVC) and hydrogenated acrylonitrile—butadiene rubber (HNBR) undergoes crosslinking at high molding temperatures in the absence of any external curing agents. This is evident from Monsanto rheometric, solvent swelling, and infrared spectroscopic studies. The reaction proceeds through the interaction of allylic and tertiary chlorine in PVC, with amide and acid groups in HNBR formed during molding. The network structure is believed to consist of amide and ester crosslinks. Dynamic mechanical analysis and differential scanning calorimetry show that the blend components are miscible Variation in molding time and temperature has no effect on the miscibility.
Journal of Vinyl and Additive Technology
Page 1. Studies on Morphology, Mechanical Properties and Failure Mode of Blends of Plasticized Po... more Page 1. Studies on Morphology, Mechanical Properties and Failure Mode of Blends of Plasticized Poly(Viny1 Chloride) and Thermoplastic Copolyester Elastomer SABU THOMAS, BR GUPTA, and SK DE Rubber Technology ...
Journal of Polymer Science: Polymer Letters Edition
Rubber Chemistry and Technology
The paper reports that the processing behavior and physical properties of the blends of silicone ... more The paper reports that the processing behavior and physical properties of the blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene terpolymer. The processing behavior of the fluororubber can be improved on blending with low viscous silicone rubber. The results indicate that the processing behavior, mechanical properties, surface energies, and flammability of the blends are controlled by the blend morphology. Surface morphology of the blends show that blends of two rubbers are microheterogeneous and biphasic structure, wherein silicone rubber acts as a continuous matrix with the fluororubber as a dispersed phase.
Rubber Chemistry and Technology
This paper reviews the utilization of waste rubber and waste plastics for the preparation of ther... more This paper reviews the utilization of waste rubber and waste plastics for the preparation of thermoplastic elastomers (TPEs). TPEs based on ground rubber tire (GRT), waste EPDM rubber, waste nitrile rubber, recycled rubber, latex waste, and waste plastics are described with respect to composition and physical properties. It is found that part of the rubber phase or plastics phase or both in the rubber-plastics blend can be replaced with corresponding waste polymer for the preparation of thermoplastic elastomers. In many cases, the materials prepared from waste polymers show properties comparable to those prepared from fresh polymers. However, in some cases, the materials prepared from waste rubber or waste plastics cannot be classified as TPEs, as the blend compositions show very low elongation at break. Modification of the waste polymer or the use of compatibilizers result in stronger composites.
Rubber Chemistry and Technology
The following conclusions can be drawn from the above results and discussion: (1) The bonding bet... more The following conclusions can be drawn from the above results and discussion: (1) The bonding between jute fiber and rubber matrix is poor without any bonding agent. (2) Addition of 5 phr silica is essential and sufficient for promoting adhesion between fiber and matrix of a mix containing 5 phr resorcinol and 3.2 phr (3) The jute fiber will act as a reinforcing filler only when added above a volume loading of 10 percent. (4) The aging resistance of jute fiber reinforced natural rubber composites is excellent beyond a fiber loading of 10 volume percent.
The Journal of Physical Chemistry, 1971
J Adhes Sci Technol, 1992
ABSTRACT
Kautschuk Und Gummi Kunststoffe, 1991
Polymer Engineering and Science, 1986
ABSTRACT
Rubber Chemistry and Technology, Sep 1, 2001
Ground rubber tire (GRT) powders were chlorinated by trichloroisocyanuric acid (TCLCA). GRT powde... more Ground rubber tire (GRT) powders were chlorinated by trichloroisocyanuric acid (TCLCA). GRT powders of different chlorination levels were characterized by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDAX), attenuated total reflection infrared (ATR-IR) spectroscopy, thermal, dielectric, and stress—strain properties on molded GRT specimens. Surface energy of the powders was estimated. Dynamic mechanical thermal analysis of molded GRT specimen reveals a biphasic structure. Plasticized poly(vinyl chloride) (PVC) compound, when blended with chlorinated GRT, shows improved physical properties in comparison to non-chlorinated GRT.
Journal of Applied Polymer Science, 1986
Journal of Macromolecular Science Part C Polymer Reviews, Feb 23, 2007
ABSTRACT
Journal of Materials Science, 1990
Polymers and Polymer Composites
The thermorheological behaviour of thermoplastic elastomeric blends based on both ground rubber t... more The thermorheological behaviour of thermoplastic elastomeric blends based on both ground rubber tyre (GRT) and maleic anhydride grafted GRT (m-GRT) has been studied. The blend composition based on m-GRT exhibits a higher melt viscosity than the corresponding control blend based on GRT. The former exhibits lower die swell and less melt fracture at low shear rates than the latter, when extruded at 180°C through a capillary rheometer. At high shear rates, however, both the blends exhibit melt fracture. There is apparently some interaction between m-GRT and the matrix, which is evident from dynamic mechanical analysis. The m-GRT causes a significant lowering in tanδ at temperatures higher than the Tg of the blend.
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry
The Journal of Physical Chemistry
... Mosk. Univ. Ser. 11, Khim., 17, No. 5, 14 (1962). (4) H. M. Rosenstock, JR Walton, and L. K. ... more ... Mosk. Univ. Ser. 11, Khim., 17, No. 5, 14 (1962). (4) H. M. Rosenstock, JR Walton, and L. K. Brice, US Atomic Energy Commission Report ORNL-2772 (1959). (5) G. Blue, JW Green, R. G. Bautista, and JL Margrave, J. Phys. Chem., 67, 877 (1963). ...
Rubber Chemistry and Technology
A blend of Poly(vinyl chloride) (PVC) and hydrogenated acrylonitrile—butadiene rubber (HNBR) unde... more A blend of Poly(vinyl chloride) (PVC) and hydrogenated acrylonitrile—butadiene rubber (HNBR) undergoes crosslinking at high molding temperatures in the absence of any external curing agents. This is evident from Monsanto rheometric, solvent swelling, and infrared spectroscopic studies. The reaction proceeds through the interaction of allylic and tertiary chlorine in PVC, with amide and acid groups in HNBR formed during molding. The network structure is believed to consist of amide and ester crosslinks. Dynamic mechanical analysis and differential scanning calorimetry show that the blend components are miscible Variation in molding time and temperature has no effect on the miscibility.
Journal of Vinyl and Additive Technology
Page 1. Studies on Morphology, Mechanical Properties and Failure Mode of Blends of Plasticized Po... more Page 1. Studies on Morphology, Mechanical Properties and Failure Mode of Blends of Plasticized Poly(Viny1 Chloride) and Thermoplastic Copolyester Elastomer SABU THOMAS, BR GUPTA, and SK DE Rubber Technology ...
Journal of Polymer Science: Polymer Letters Edition
Rubber Chemistry and Technology
The paper reports that the processing behavior and physical properties of the blends of silicone ... more The paper reports that the processing behavior and physical properties of the blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene terpolymer. The processing behavior of the fluororubber can be improved on blending with low viscous silicone rubber. The results indicate that the processing behavior, mechanical properties, surface energies, and flammability of the blends are controlled by the blend morphology. Surface morphology of the blends show that blends of two rubbers are microheterogeneous and biphasic structure, wherein silicone rubber acts as a continuous matrix with the fluororubber as a dispersed phase.
Rubber Chemistry and Technology
This paper reviews the utilization of waste rubber and waste plastics for the preparation of ther... more This paper reviews the utilization of waste rubber and waste plastics for the preparation of thermoplastic elastomers (TPEs). TPEs based on ground rubber tire (GRT), waste EPDM rubber, waste nitrile rubber, recycled rubber, latex waste, and waste plastics are described with respect to composition and physical properties. It is found that part of the rubber phase or plastics phase or both in the rubber-plastics blend can be replaced with corresponding waste polymer for the preparation of thermoplastic elastomers. In many cases, the materials prepared from waste polymers show properties comparable to those prepared from fresh polymers. However, in some cases, the materials prepared from waste rubber or waste plastics cannot be classified as TPEs, as the blend compositions show very low elongation at break. Modification of the waste polymer or the use of compatibilizers result in stronger composites.
Rubber Chemistry and Technology
The following conclusions can be drawn from the above results and discussion: (1) The bonding bet... more The following conclusions can be drawn from the above results and discussion: (1) The bonding between jute fiber and rubber matrix is poor without any bonding agent. (2) Addition of 5 phr silica is essential and sufficient for promoting adhesion between fiber and matrix of a mix containing 5 phr resorcinol and 3.2 phr (3) The jute fiber will act as a reinforcing filler only when added above a volume loading of 10 percent. (4) The aging resistance of jute fiber reinforced natural rubber composites is excellent beyond a fiber loading of 10 volume percent.
The Journal of Physical Chemistry, 1971
J Adhes Sci Technol, 1992
ABSTRACT
Kautschuk Und Gummi Kunststoffe, 1991
Polymer Engineering and Science, 1986
ABSTRACT
Rubber Chemistry and Technology, Sep 1, 2001
Ground rubber tire (GRT) powders were chlorinated by trichloroisocyanuric acid (TCLCA). GRT powde... more Ground rubber tire (GRT) powders were chlorinated by trichloroisocyanuric acid (TCLCA). GRT powders of different chlorination levels were characterized by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDAX), attenuated total reflection infrared (ATR-IR) spectroscopy, thermal, dielectric, and stress—strain properties on molded GRT specimens. Surface energy of the powders was estimated. Dynamic mechanical thermal analysis of molded GRT specimen reveals a biphasic structure. Plasticized poly(vinyl chloride) (PVC) compound, when blended with chlorinated GRT, shows improved physical properties in comparison to non-chlorinated GRT.
Journal of Applied Polymer Science, 1986
Journal of Macromolecular Science Part C Polymer Reviews, Feb 23, 2007
ABSTRACT