Effect of dynamic cross-linking on mixing torque behavior and tensile yield behavior of isotactic polypropylene (iPP) / ethylene-propylene diene rubber (EPDM) /nitrile rubber (NBR) elastomeric blends

2009 ◽  
Vol 17 (3) ◽  
pp. 411-427 ◽  
Author(s):  
Rakesh Kumar Soni ◽  
Harjeet Singh ◽  
Krishna Dutt ◽  
Priyanka Arora
Keyword(s):  
Isotactic Polypropylene ◽  
Nitrile Rubber ◽  
Cross Linking ◽  
Yield Behavior ◽  
Ethylene Propylene ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber ◽  
Torque Behavior

Investigation of the properties of polynorbornene rubber/EPDM blends

2016 ◽  
Vol 49 (7) ◽  
pp. 560-573 ◽  
Author(s):  
Ming Qu ◽  
Yan Ma ◽  
Chengliang Li ◽  
Xinyan Shi
Keyword(s):  
Tensile Strength ◽  
Mechanical Analysis ◽  
Cross Linking ◽  
Yield Behavior ◽  
Hot Air ◽  
Paraffin Oil ◽  
Aging Resistance ◽  
Higher Temperature ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

Polynorbornene rubbers (PNRs) used in this article were commercial compounds of polynorbornene filled with paraffin oil and fillers. The properties of PNR and ethylene-propylene-diene rubber (EPDM2650) blends with ratios of 100/0, 75/25, 50/50, 25/75, and 0/100 were investigated. Blends were cured by sulfur and accelerator at 150°C and 160°C, respectively. Moving die rheometer, differential scanning calorimeter (DSC), dynamic mechanical analysis (DMA), and rubber process analyzer were used to examine the properties of the blends. The PNR exhibited significant reversion that was reduced by blending with EPDM. The thermal cross-linking of PNR occurred during hot air aging. The hot air aging resistance of PNR was improved by blending with EPDM. After 72 h of ozone aging, no obvious cracks were observed on the surface. The DMA results showed that the effective damping temperature range (tanδ ≥ 0.3) of vulcanized PNR was the broadest at 113°Cand then narrowed at higher temperature as the content of EPDM in the blend increased. With an increase in the ratio of EPDM, the glass transition temperature ( Tg) of EPDM moved to higher temperatures, as measured by DSC. The tensile strength of neat PNR is the greatest. PNR/EPDM = 75/25 blends showed yield behavior as the Tg of PNR moved to the higher temperature. These effects are attributed to a transfer of the extended oil from the PNR to the EPDM.

scholarly journals Off-line analysis in the manganese catalysed epoxidation of ethylene-propylene-diene rubber (EPDM) with hydrogen peroxide

RSC Advances ◽  
2021 ◽  
Vol 11 (51) ◽  
pp. 32505-32512
Author(s):  
C. Maurits de Roo ◽  
Johann B. Kasper ◽  
Martin van Duin ◽  
Francesco Mecozzi ◽  
Wesley Browne
Keyword(s):  
Hydrogen Peroxide ◽  
Cross Linking ◽  
Reactive Blending ◽  
Ethylene Propylene ◽  
Polar Materials ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber ◽  
Line Analysis

Epoxidation of ethylene-propylene-diene rubber (EPDM), based on 5-ethylidene-2-norbornene, to epoxidized EPDM (eEPDM) opens routes to cross-linking and reactive blending, with increased polarity aiding adhesion to polar materials such as silica.

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