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Mandal A.K.,Maulana Abul Kalam Azad University of Technology | Siddhanta S.K.,Bhawanipur Escollege | Chakraborty D.,University of Calcutta
Journal of Applied Polymer Science | Year: 2013

Different thermoplastic vulcanizate (TPV) blends were prepared from elastomeric chlorosulfonated polyethylene (CSM) and thermoplastic polypropylene (PP) by employing dynamic vulcanization technique. The mechanical properties of such blends were compared in respect of their stress at 25% modulus (25%M), ultimate tensile strength (UTS), percent elongation at break, and hardness to those of pure CSM. The mechanical analysis showed substantial improvement in stress at 25%M, UTS, and hardness values with the incorporation of 15-40 parts of thermoplastic contents (PP) (per hundred parts of blend). The two-phase morphologies were clearly observed by scanning electron microscopy studies. The thermal properties were studied by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). DSC studies showed a decreasing trend in glass transition temperature (T g) and TGA studies indicated the increase in thermal stability of all TPV blends with respect to the elastomeric CSM. Rheological studies showed that there is an increasing trend in shear melt viscosity of TPV blends with the increase in PP amount as the higher content of isotactic PP used in the present case increases the melt viscosity. The TPVs obtained after the rheotron studies displayed identical shear stress/strain pattern when further subjected to the same study. Copyright © 2012 Wiley Periodicals, Inc.


Mandal A.K.,Dumkal Institute of Engineering and Technology | Chakraborty D.,University of Calcutta | Siddhanta S.K.,Bhawanipur Escollege
Journal of Applied Polymer Science | Year: 2014

Elastomeric Chlorosulfonated polyethylene (Hypalon®) and thermoplastic Polypropylene (PP) based thermoplastic vulcanizates (TPVs) were prepared in presence of different doses of compatibilizer, maleic anhydride grafted PP (PP-g-MA) by employing dynamic vulcanization technique. The effect of incorporation in different proportions of compatibilizer on mechanical, spectral, morphological, thermal, and rheological properties of such TPVs was studied and the same were compared to that of virgin PP and amongst themselves. The mechanical analysis of the prepared TPVs exhibited significant improvements in stress at 25% modulus, ultimate tensile strength (UTS), and hardness values. FTIR studies revealed that a chemical interaction had taken place between Hypalon® and functionalized compatibilizer during the process of dynamic vulcanization which led to an enhancement of interfacial adhesion between them. The two-phase morphologies were clearly observed by scanning electron microscopic studies. The Tg values of Hypalon® was modified in the TPVs as exhibited by differential scanning calorimetric studies. TGA studies indicated the increase in thermal stability of all TPVs with respect to the elastomeric Hypalon®. Rheological properties showed that the compatibilizer reduces the melt viscosity of TPVs and thus facilitates the processibility of such TPVs. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40312. Copyright © 2014 Wiley Periodicals, Inc.


Mandal P.K.,University of Calcutta | Siddhanta S.K.,Bhawanipur Escollege | Chakraborty D.,University of Calcutta
Journal of Applied Polymer Science | Year: 2011

Polypropylene (PP) was melt blended with Vectra B-950 [a thermotropic liquid crystalline polymer (LCP)], in a single screw extruder in presence of different doses of ethylene acrylic acid (EAA) copolymer, as modifier. The effect of incorporation in different proportions of EAA at a fixed dose of 5% LCP, on mechanical, thermal, morphological, and rheological properties of such blends was studied and the same were compared with that of pure PP and amongst themselves. Mechanical analysis (tensile properties) of the prepared blends exhibited improvements in ultimate tensile strength (UTS), modulus, toughness, hardness, and impact strength of PP matrix with the incorporation of EAA. The improvement in mechanical properties is associated with the formation of LCP fibrils as evidenced by scanning electron microscopy (SEM). A strong interaction through H-bonding between the segments of Vectra B-950 and EAA was established by FTIR study. Differential scanning calorimetry (DSC) studies indicated substantial increase in melting point of the blends, and thermogravimetric analysis (TGA) showed that the thermal stability of PP was improved with the addition of LCP and EAA. Rheological properties showed that LCP and EAA drop down the melt viscosity of PP and thus facilitate processibility of blends. © 2010 Wiley Periodicals, Inc.


Mandal P.K.,Central Institute of Plastic Engineering and Technology | Siddhanta S.K.,Central Institute of Plastic Engineering and Technology | Siddhanta S.K.,Bhawanipur Escollege | Chakraborty D.,University of Calcutta
Journal of Polymer Materials | Year: 2012

Polypropylene/Vectra A 950 blends were prepared in a single screw extruder in presence of different doses of ethylene acrylic acid copolymer (EAA), as a compatibilizer. The effect of incorporation in different proportions of EAA at a fixed dose of 5% Vectra A 950, on different properties of such blends was studied. Mechanical analysis exhibited improvements in tensile properties of polypropylene matrix with the incorporation of EAA. The prepared such blends were further characterized by FTIR spectroscopy, SEM, DSC and TGA studies. Rheological studies showed that both Vectra A 950 and EAA drop down the melt viscosity of polypropylene. © MD Publications Pvt. Ltd.

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