Achintya Sen

• Head of Innovation and Fiber Business at Clariant Chemicals ( India ) Limited

Preparation of heat, oil and fire resistant (HOFR) cable sheathing compounds is attempted by blending polychloroprene (PCP) and ethylene‐propylene‐diene terpolymer (EPDM) using dibutyl maleate grafted EPDM (EPDMgDBM) and chlorinated polyethylene (CPE) as compatibilizer. Cure rate incompatibility has been minimised by adding the curing agents in mas...

Functionalization of polyethylene (PE) and ethylene propylene diene terpolymer (EPDM) in the bulk through dicumyl peroxide (DCP) initiated grafting of dibutyl maleate (DBM) has been studied in the temperature range from 140 to 200°C. The degree of grafting has been determined by infrared spectrophotometry and DSC. The concentration of DBM and DCP h...

Graft copolymerization of low density polyethylene (PE) with acrylic acid (AA), ethyl acrylate (EA) and butyl acrylate (BA) using dicumyl peroxide (DCP) as the initiator was studied using differential scanning calorimetry (DSC) under the dynamic (non-isothermal) condition and in the shear mixer of a Brabender plasticorder at 170°C (443°K). DSC stud...

Blends of low density polyethylene (PE) of density 915 kg m− 3 and ethylene propylene diene rubber (EPDM) of density 860 kg m− 3 were vulcanized using two different sulfur accelerator curative systems: (A) a conventional curative system based on a combination of TMTD, MBTS and S; and (B) a silane curative system based on a combination of TMTD, Si69...

Oxidative degradation of ethylene propylene diene (EPDM) rubber containing varying amounts of ethylene units has been carried out using phase-transferred permanganate as oxidant. The oxidised products have been characterised by IR spectroscopy. The degradation behaviour of EPDM rubbers has been studied by thermogravimetry in air. A comparison of th...

Comparative studies on the dynamic and static vulcanization of blends of polyethylene (PE) and ethylene-propylene-diene monomer rubber (EPDM) are reported. The studies were made using a PE/EPDM blend ratio range of to , over which the occurrence of phase inversion was indicated from torque rheometric studies. The state and rate of sulfur cure were...

The ageing and degradation behaviour of α polychloroprene (PCP), control polychloroprene-ethylene propylene diene rubber (EPDM) blend and dibutyl maleate grafted EPDM (EPDMgDBM) and chlorinated polyethylene (CPE) compatibilized PCP-EPDM blends have been studied. Air-oven and air-bomb ageing results indicate the superior ageing resistance of the com...

The effect of silane and dicumyl peroxide (DCP) induced crosslinking, as well as the effect of annealing on the thermal properties and structural parameters of polyethylene (PE) and its blends with ethylene propylene rubber (EPR) have been studied by differential scanning calorimetry (DSC) and X-ray diffraction analysis. The reduction in the meltin...

Low-density polyethylene (LDPE) has been functionalized in the bulk through dicumyl peroxide (DCP)-initiated grafting of dibutyl maleate (DBM) and vinyltrimethoxysilane (VTMO) in the temperature range from 140 to 200°C. The functionalized surfaces have been characterized through contact angle and contact-angle hysteresis measurements as well as thr...

The decomposition behaviour and kinetics of oxidative decomposition of hydrogenated nitrile rubber (HNBR), zinc-poly(methyl methacrylate) resin (ZSC-2295) and the tank track pad compositions developed from their blends have been studied by thermogravimetry in air and compared with those of natural rubber (NR) and styrene-butadiene rubber (SBR) base...

The degradation behavior and kinetics of degradation of polyethylene (PE), ethylene propylene rubber (EPR), silane-grafted PE (PEgS) and EPR (EPRgS), and silane and dicumyl peroxide (DCP) cross-linked PE, EPR and their blends, have been studied by thermogravimetry in both nitrogen and air. The effect of silane grafting and subsequent cross-linking...

Crosslinking of nitrile rubber (NBR) and poly(vinyl chloride) (PVC) can be accomplished separately using ethylenethiourea (ETU) with and without the presence of sulphur (S) respectively. ETU/S combination in appropriate doses brings about ready co-crosslinking of NBR and PVC in their blends. Comparative studies of the curing characteristics of some...

Peroxide initiated graft copolymerization of vinyl trimethoxy silane (VTMO) and vinyl triethoxy silane (VTEO) onto polyethylene (PE) and ethylene propylene copolymer (EPR) was studied. The kinetics of grafting, studied by differential scanning calorimetry, are the same for all the systems and the activation energy for VTMO is 170 ± 4 KJ/mol. Activa...

An attempt is made to develop a novel series of cable sheathing compounds with variation in chlorine content and sufficient fire retardance and unique low-smoke characteristics. These are prepared by blending PVC and functionalized polyolefins in different compositions. PE and EPDM have been functionalized by grafting dibutyl maleate (DBM) using DC...

The effect of blend ratio and peroxide concentration on crosslinking characteristics of EPDM-PE blends were studied by Differential Scanning Calorimetry, Brabender plasticorder and Rheometer. Crosslinking of EPDM-PE blends follows first order reaction kinetics. The curing exotherm increases but activation energy decreases with increase in EPDM cont...

The effect of blend ratio and cross-linking in ethylene propylene diene terpolymer (EPDM) and polyethylene (PE) blends on the crystallization and fusion processes of PE were studied. The cross-linking was varied by varying the level of dicumyl peroxide (DCP) from 0.5 to 5 parts. The melting point, percentage crystallinity, heat of fusion and entrop...