Sadhan De - Academia.edu (original) (raw)

Papers by Sadhan De

Research paper thumbnail of Pressure-sensitive electrically conductive nitrile rubber composites filled with particulate carbon black and short carbon fibre

Journal of Materials Science, 1990

Research paper thumbnail of Electromagnetic Interference Shielding by Carbon Fibre Composite

Research paper thumbnail of Influence of Maleation of Ground Rubber Tyre (GRT) on the Thermorheological behaviour of Thermoplastic Elastomers Based on Ethylene Propylene Diene Rubber, GRT and Ethylene-co-acrylic acid

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.

Research paper thumbnail of Studies on mechanical properties and fractography of γ-ray irradiated blends of plasticized poly(vinyl chloride) and thermoplastic copolyester elastomer

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

Research paper thumbnail of Hydrogen-bonding interaction between alcohols and ethylene trithiocarbonate

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). ...

Research paper thumbnail of Thermally Induced Crosslinking in Blends of Poly(Vinyl Chloride) and Hydrogenated Acrylonitrile—Butadiene Rubber

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.

Research paper thumbnail of Thermo-oxidative ageing and its effect on the network structure and fracture mode of natural rubber vulcanizates

Research paper thumbnail of Electrically conducting composite materials with insulating surfaces

Research paper thumbnail of Studies on morphology, mechanical properties and failure mode of blends of plasticized poly(vinyl chloride) and thermoplastic copolyester elastomer

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 ...

Research paper thumbnail of Network structure of lignin-filled natural rubber vulcanizate

Journal of Polymer Science: Polymer Letters Edition

Research paper thumbnail of Dependence of Physical Properties and Processing Behavior of Blends of Silicone Rubber and Fluororubber on Blend Morphology

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.

Research paper thumbnail of Thermoplastic Elastomers Based on Waste Rubber and Plastics

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.

Research paper thumbnail of Short Jute Fiber Reinforced Rubber 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.

Research paper thumbnail of N-H....pi. hydrogen bonding

The Journal of Physical Chemistry, 1971

Research paper thumbnail of Effect of silica filler on aluminum-aluminum bonding by a self-vulcanizable blend based on chlorobutyl rubber and carboxylated nitrile rubber

J Adhes Sci Technol, 1992

ABSTRACT

Research paper thumbnail of Self-Vulcanisable Rubber-Rubber Blends Based on Epoxidised Natural Rubber and Polychloroprene

Kautschuk Und Gummi Kunststoffe, 1991

Research paper thumbnail of Effect of cryo-ground rubber on melt flow and mechanical properties of polyprolylene

Polymer Engineering and Science, 1986

ABSTRACT

Research paper thumbnail of Surface chlorination of ground rubber tire and its characterization

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.

Research paper thumbnail of Tensile failure of γ‐ray irradiated blends of high‐density polyethylene and natural rubber

Journal of Applied Polymer Science, 1986

Research paper thumbnail of Mixed Cross-Link Systems in Elastomers

Journal of Macromolecular Science Part C Polymer Reviews, Feb 23, 2007

ABSTRACT

Research paper thumbnail of Pressure-sensitive electrically conductive nitrile rubber composites filled with particulate carbon black and short carbon fibre

Journal of Materials Science, 1990

Research paper thumbnail of Electromagnetic Interference Shielding by Carbon Fibre Composite

Research paper thumbnail of Influence of Maleation of Ground Rubber Tyre (GRT) on the Thermorheological behaviour of Thermoplastic Elastomers Based on Ethylene Propylene Diene Rubber, GRT and Ethylene-co-acrylic acid

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.

Research paper thumbnail of Studies on mechanical properties and fractography of γ-ray irradiated blends of plasticized poly(vinyl chloride) and thermoplastic copolyester elastomer

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

Research paper thumbnail of Hydrogen-bonding interaction between alcohols and ethylene trithiocarbonate

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). ...

Research paper thumbnail of Thermally Induced Crosslinking in Blends of Poly(Vinyl Chloride) and Hydrogenated Acrylonitrile—Butadiene Rubber

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.

Research paper thumbnail of Thermo-oxidative ageing and its effect on the network structure and fracture mode of natural rubber vulcanizates

Research paper thumbnail of Electrically conducting composite materials with insulating surfaces

Research paper thumbnail of Studies on morphology, mechanical properties and failure mode of blends of plasticized poly(vinyl chloride) and thermoplastic copolyester elastomer

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 ...

Research paper thumbnail of Network structure of lignin-filled natural rubber vulcanizate

Journal of Polymer Science: Polymer Letters Edition

Research paper thumbnail of Dependence of Physical Properties and Processing Behavior of Blends of Silicone Rubber and Fluororubber on Blend Morphology

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.

Research paper thumbnail of Thermoplastic Elastomers Based on Waste Rubber and Plastics

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.

Research paper thumbnail of Short Jute Fiber Reinforced Rubber 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.

Research paper thumbnail of N-H....pi. hydrogen bonding

The Journal of Physical Chemistry, 1971

Research paper thumbnail of Effect of silica filler on aluminum-aluminum bonding by a self-vulcanizable blend based on chlorobutyl rubber and carboxylated nitrile rubber

J Adhes Sci Technol, 1992

ABSTRACT

Research paper thumbnail of Self-Vulcanisable Rubber-Rubber Blends Based on Epoxidised Natural Rubber and Polychloroprene

Kautschuk Und Gummi Kunststoffe, 1991

Research paper thumbnail of Effect of cryo-ground rubber on melt flow and mechanical properties of polyprolylene

Polymer Engineering and Science, 1986

ABSTRACT

Research paper thumbnail of Surface chlorination of ground rubber tire and its characterization

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.

Research paper thumbnail of Tensile failure of γ‐ray irradiated blends of high‐density polyethylene and natural rubber

Journal of Applied Polymer Science, 1986

Research paper thumbnail of Mixed Cross-Link Systems in Elastomers

Journal of Macromolecular Science Part C Polymer Reviews, Feb 23, 2007

ABSTRACT