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.

Preparation and Properties of Acidified Prevulcanized Natural Rubber Latex

2014 ◽  
Vol 997 ◽  
pp. 239-242
Author(s):  
Guang Lu ◽  
He Ping Yu ◽  
Yong Zhou Wang ◽  
Yong Yue Luo ◽  
Zong Qiang Zeng
Keyword(s):  
Tensile Strength ◽  
Acetic Acid ◽  
Natural Rubber ◽  
Acid Content ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Elongation At Break ◽  
Acetic Acid Content ◽  
Hot Air ◽  
Aging Resistance

After a maturation of three days at ambient temperature, the sulfur-prevulcanized natural rubber latex (SNRL) was stabilized by 20wt% Peregal O, and then acidified with the 36wt% acetic acid by a ratio of 5, 15, 25, 35 and 45 g of 36wt% acetic acid to 100g SNRL, to obtain acidified prevulcanized NR latex (ASNRL) with different acidity, respectively. The viscosity of ASNRL increased, while the nitrogen content decreased, with the increment of acetic acid content and the decrease in pH; for unaged samples, the tensile strength, elongation at break, 300% and 500% moduli of the ASNRL films were only slightly lower than those of SNRL film; however the hot-air aging resistance decreased with the increment of acetic acid content.

Effect of Carbon Nanotube Content on Properties of Ethylene Propylene Diene Rubber/CaCO3/ Carbon Nanotube Composites

2017 ◽  
Vol 1142 ◽  
pp. 206-210
Author(s):  
Jun Su ◽  
Cai Hong Li
Keyword(s):  
Tensile Strength ◽  
Carbon Nanotube ◽  
Color Change ◽  
Color Difference ◽  
Ethylene Propylene ◽  
Nanotube Composites ◽  
Total Color Change ◽  
Carbon Nanotube Composites ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

This paper studies how the addition and various content of Carbon nanotube (CNT) affecting the properties, especially the color difference of ethylene propylene diene rubber (EPDM)/ CaCO3 composites. The results show that the increased content of CNT can turn EPDM/CaCO3 composites from lighter, greener, and bluer to darker, redder and yellower, respectively. The total color change (ΔE) of EPDM/CaCO3 composites is acceptable, when the content of CNT is less than 2wt%. The optimum tensile strength of EPDM composites can be gained, when the content of CNT is 3%.

EPDM RUBBER PLASTICIZED WITH POLYMERIC SOYBEAN OIL OF DIFFERENT MOLECULAR WEIGHTS

2017 ◽  
Vol 90 (4) ◽  
pp. 667-682 ◽  
Author(s):  
Zoran S. Petrović ◽  
Jelena Milić ◽  
Mihail Ionescu ◽  
James R. Halladay
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
Soybean Oil ◽  
Cross Linking ◽  
Tear Strength ◽  
Soybean Oils ◽  
Molecular Weights ◽  
Compression Set ◽  
Diene Rubber ◽  
Processing Aids

ABSTRACT Polymerization of soybean oil produces higher-viscosity liquids, which may serve as processing aids and plasticizers in certain rubbers as a replacement of petrochemical oils. Four polymerized soybean oils of different molecular weights showed good compatibility with ethylene–propylene–diene rubber (EPDM), but because of the presence of double bonds and copolymerization with EPDM, they decreased the cross-linking density when compared with paraffinic extender oil. As a consequence, polymeric soybean oils reduced tensile strength and modulus but increased elongation, tear strength, and compression set. Higher-molecular-weight plasticizers are expected to reduce sweating out of oils. Pure soybean oil was not completely compatible at the concentration tested, but it showed a strong plasticizing effect; dramatically lowered tensile strength, tear strength, and modulus; and increased elongation and compression set. No clear effect of molecular weight of polymerized soybean oils on properties was observed, but increasing the sulfur content was found to be beneficial. Using polymeric vegetable oils instead of petrochemical extenders in EPDM rubbers is economical and environmentally desirable, but the curing system requires optimization to accommodate loss of cross-linking density.

Ultrafine Wollastonite Reinforced Polypropylene/Ethylene Propylene Diene Rubber Thermoplastic Elastomers

2012 ◽  
Vol 488-489 ◽  
pp. 945-949 ◽  
Author(s):  
Saowaroj Chuayjuljit ◽  
Thatisorn Karnjanamayul
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Thermoplastic Elastomers ◽  
Dependent Manner ◽  
Elongation At Break ◽  
Ethylene Propylene ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

In this study, tensile properties, thermal stability and morphology of polypropylene/ethylene propylene diene rubber/wollastonite (PP/EPDM/wollastonite) thermoplastic elastomer composites were tested and evaluated as a function of their compositions in comparison with PP/EPDM blends and native PP. PP was melt mixed with two loadings of EPDM (20 and 30% (w/w)) and for the composites each of these with three loadings of wollastonite (10, 20 and 30 parts by weight per hundred of the PP/EPDM resin) on a twin screw extruder and then injection molded. Both PP/EPDM blends provided a higher elongation at break but a lower tensile strength and Young’s modulus as compared with those of the neat PP. However, the addition of wollastonite microparticles (particle size of 1200 mesh) into the blends increased the Young’s modulus in a dose-dependent manner with increasing wollastonite loadings, whilst the tensile strength and elongation at break were decreased. Moreover, the thermal stability was improved by the presence of either EPDM or wollastonite in the PP matrix.

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.

scholarly journals An Ambient Curable Coating Material Based on the Michael Addition Reaction of Acetoacetylated Castor Oil and Multifunctional Acrylate

Coatings ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 37 ◽  
Author(s):  
Tong Wang ◽  
Jianli Wang ◽  
Xianfeng He ◽  
Zhiyuan Cao ◽  
Dongdong Xu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Michael Addition ◽  
Castor Oil ◽  
Addition Reaction ◽  
13C Nmr Spectroscopy ◽  
Mechanical Analysis ◽  
Cross Linking ◽  
Michael Addition Reaction ◽  
Scanning Calorimetry ◽  
The Michael Addition

In this work a novel ambient curable coating was synthesized based on the Michael addition reaction of acetoacetylated castor oil and a multifunctional acrylate. In the research, we used hexamethylene diacrylate as crosslinker to optimize the reaction conditions and found that a ratio of acetoacetylated castor oil to acrylate groups of 1:1.5 and a catalyst (DBU) loading of 2 wt % provided an appropriate curing time. The acetoacetylated castor oil was characterized by 1H NMR and 13C NMR spectroscopy and the obtained coating characterized by FTIR to confirm the functionalization reaction. The tensile strength, cross linking density, and thermal properties of the resulting thermosets were investigated by dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Results demonstrated that the glass transition temperatures, tensile strength, and thermal degradation were significantly improved with higher cross-linking density. Moreover, we prepared films with different multifunctional acrylate cross-linkers and found that with the increase of cross-linking density, the swelling of the film rate decreased. Overall, thermosets made from Michael crosslinking technology provided a highly bio-based coating system.

Preparation and Properties of Ethylene Propylene Diene Rubber/SiO2/Carbon Nanotubes Composites

2017 ◽  
Vol 1142 ◽  
pp. 201-205 ◽  
Author(s):  
Jun Su ◽  
Cai Hong Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Color Change ◽  
Ethylene Propylene ◽  
Total Color Change ◽  
Ethylene Propylene Diene Rubber ◽  
Diene Rubber

This paper studies how the addition of Carbon nanotubes (CNT) influencing the properties, especially the mechanical properties and colorimetry of ethylene propylene diene rubber (EPDM)/SiO2 composites. The results show that the increased content of CNT can turn EPDM/SiO2 composites from lighter, redder, and yellower to darker, greener and bluer, respectively. The total color change (ΔE) of EPDM/SiO2 composites would be acceptable when the CNT content is below 3%. When the CNTs content reaches 4%, the tensile strength of EPDM is the maximum.

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