Rheological behavior and processability of neoprene and acrylic rubbers

Kumar, Nikhil; Gupta, B. R.; Bhowmick, Anil K.

doi:10.1002/pen.760331510

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…The increase in die swell with increasing shear rate may be attributed to the considerable increase in the recoverable elastic energy of the system at higher shear rates. The increase in temperature increases the mobility of the polymer chain, which reduces the capacity of polymer molecules to store the elastic energy and, hence, there is a reduction in the die swell values 20–22. Die swell at 6 wt % of EMA is maximum at any shear rate, implying that optimum compatibilization leads to a physically entangled structure of a three‐dimensional network, which obstructs the chains to move past one another.…”

Section: Resultsmentioning

confidence: 99%

Chemorheological study of compatibilized blends of low‐density polyethylene and polydimethyl siloxane rubber

Jana

Nando

2003

J of Applied Polymer Sci

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ABSTRACT:Compatibilization of the blends of polydimethyl siloxane (PDMS) rubber and low-density polyethylene (LDPE) was achieved through reactive processing during extrusion in a Monsanto Processability Tester (MPT). The chemorheological characteristics of 50 : 50 LDPE : PDMS blends with varying proportions (0 -8 wt %) of ethylene comethyl acrylate (EMA) were investigated at three different temperatures (170, 190, and 210°C) and four different shear rates (61.3, 122.6, 306.6, and 613.1 s Ϫ1 ). It was found that EMA reacts with vinyl groups of PDMS rubber at a temperature of 190°C during extrusion through the capillary of MPT, forming EMA-grafted-PDMS rubber (EMA-g-PDMS), which acts as the compatibilizer for the blend systems. The results are based on IR spectroscopy, melt rheology, and phase morphology of the blends.

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Section: Resultsmentioning

confidence: 99%

Chemorheological study of compatibilized blends of low‐density polyethylene and polydimethyl siloxane rubber

Jana

Nando

2003

J of Applied Polymer Sci

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“…In their earlier work, they also reported the processability of a neoprene and acrylate rubber blend 14 . Lipatov et al 15 reported the effect of fillers on the rheological characteristics of polyvinyl acetate and ethylene vinyl acetate, using a cone -plate rheometer.…”

Section: Introductionmentioning

confidence: 99%

Rheological and Mechanical Properties of Gum and Filled Blends of Acrylate Rubber and Fluororubber

Kader

Bhattacharyya

Bhowmick

2001

Polymers and Polymer Composites

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Rheological, mechanical and dynamic mechanical thermal properties of gum and filled acrylate rubber (ACM), fluoro rubber (FKM) and their blends were studied. The systems exhibited pseudo plastic flow behaviour. The shear viscosity of the blends decreased with higher concentration of ACM. There was little effect of temperature on the viscosity of the blends at different shear rates. Addition of filler to the 50/50 (w/w) ACM/FKM blend increased the shear viscosity. The equilibrium die swell decreased with increasing loading of carbon black and was affected by the filler type. A linear generalized relationship was obtained between die swell and maximum recoverable deformation. The activation energy of the melt flow process decreased with an increase in shear rate for all the gum and filled systems except neat ACM, where there was a slight increase in activation energy. The mechanical properties of the filled compounds improved linearly with filler loading. Tan δ peak temperature did not change with filler loading although the values of tan δmaximum decreased. The storage modulus of the blends increased with increasing filler loading, indicating the presence of polymer filler interactions.

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Rheological behavior of highly filled ethylene propylene diene rubber compounds

Marković

Choudhury

Dimopoulos

et al. 2000

Polymer Engineering & Sci

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The rheological behavior of highly filled ethylene propylene diene rubber (EPDM) compounds was studied with respect to the effect of curative system, grafted rubber, shear rate, temperature and die swell using a Monsanto Processability Tester (MPT) to gain an understanding of the molecular parameters that control the surface finish. All systems show pseudoplastic behavior. At a particular shear rate, shear viscosity increases with blend ratio. The dependence of flow behavior on extrusion velocity indicates a surface effect. The extrudate die swell and maximum recoverable deformation are related by a linear relationship, which is independent of sulfur/accelerator ratio, extrusion temperature and shear rates and blend ratio. The principal normal stress difference increases nonlinearly with shear stress. Activation energy decreases with shear rate in most cases. The faster relaxing system produces extrudate of better surface quality.

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Rheological behavior and processability of neoprene and acrylic rubbers

Cited by 5 publications

References 21 publications

Chemorheological study of compatibilized blends of low‐density polyethylene and polydimethyl siloxane rubber

Chemorheological study of compatibilized blends of low‐density polyethylene and polydimethyl siloxane rubber

Rheological and Mechanical Properties of Gum and Filled Blends of Acrylate Rubber and Fluororubber

Rheological behavior of highly filled ethylene propylene diene rubber compounds

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