improvement of ozone resistance of nr/epdm blends via
Improvement of Ozone Resistance of NR/EPDM Blends via
The aim of this work is to improve ozone resistance of NR/EPDM blends by adjusting viscosity ratio. Liquid polyisoprene (LIR) and liquid EPDM (LEPDM) are used to adjust the viscosities of NR and ...
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Improvement of Ozone Resistance of NR/EPDM Blends via
August 8. 2016 - The aim of this work is to improve ozone resistance of NR/EPDM blends by adjusting viscosity ratio. Liquid polyisoprene (LIR) and liquid EPDM (LEPDM) are used to adjust the viscosities of NR and EPDM, respectively. The obtained results reveal the viscosity ratio plays a significant role.
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2016-11.Improvement of ozone - mahidolrubber.org
An interesting effect of relative viscosity of NR/EPDM is to cause inversion of the phase in the 70/30 blend of NR/EPDM when the relative viscosities of NR/EPDM are greater than 1.6. Thus, for these blends, EPDM forms the matrix phase and the blends exhibit ozone resistance. All the other NR/EPDM blends show ozone resistant
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NR/Butyl Blends by Precuring EPDM and Butyl Improved
ified NR/EPDM blends, points towards optimum crosslink densities in both the NR and the EPDM phases. Similar trends are shown by NR/Butyl blends as well (Fig. 8). The variation of tear strength with blend com-position for modified and conventional NR/EPDM and NR/Butyl blends is shown in Figure 9. The modified blends show better tear strength as well.
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Effects of trans‐polyoctylene rubber (TOR)
The ozone resistance of the blends was determined in terms of a critical stress–strain parameter. The critical stored energy density for ozone cracking was significantly enhanced for the TOR containing rubber blend. It was believed that the improvement in ozone resistance arised from finely dispersed ozone‐resistant EPDM particles in the blend.
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Ozone-resistant natural rubber blends. - Free Online Library
Many papers have been published where the use of modified EPDM to improve ozone resistance of diene rubber blends with EPDM have been described[ref. 14 and 15]. It is suggested that the modified EPDMs provide better dispersion in the NR matrixes or act as cure rate inhibitors to give a more uniform cure rate.
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Control of phase morphology of natural rubber/EPDM blends
phase in the 70/30 blend of NR/EPDM when the relative viscosities of NR/EPDM were greater than 1.6. Thus, for these blends, EPDM formed the matrix phase and the blends exhibited ozone resistance. All the other NR/EPDM blends showed ozone resistant properties except the 80/20 blends of NR/EPDM and the 70/30 blends prepared by using
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EPDM-rubber in blends with NR/BR-elastomers for ozone
EPDM-rubber in blends with NR/BR-elastomers for ozone-resistant tyre sidewall applications: new approaches for improved mechanical properties ... EPDM-rubber in blends with NR/BR-elastomers for ozone-resistant tyre sidewall applications: ... There is still some room for improvement, especially for the visco-elastic properties. But due to the ...
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Preparation and characteristics of NR/EPDM rubber blends
trans-polyoctylene rubber (TOR) has improved the compatibility of NR/EPDM blend and thereby led to a finer phase morphology (14). In the present research, NR/EPDM blends were compatibilized with maleic anhydride modified EPDM. The heat and UV resistance were investigated in terms of the physico-mechanical properties, over a range of blend ratios. The
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General Properties of Elastomers - ELBEX Corporation
EPDM uses a sulfur cure system. EPDM has a typical service temperature range between –65° F and +300° F. ADVANTAGES : EPDM exhibits exceptionally good resistance to weather aging, ozone, UV exposure, water, heat, phosphate ester base hydraulic fluids (Skydrol, Fyrquel, Pydraul), dilute acids, electrical insulation.
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Improvement of Ozone Resistance of NR/EPDM Blends via
The aim of this work is to improve ozone resistance of NR/EPDM blends by adjusting viscosity ratio. Liquid polyisoprene (LIR) and liquid EPDM (LEPDM) are used to adjust the viscosities of NR and...
Send Inquiry
Improvement of Ozone Resistance of NR/EPDM Blends via
Improvement of Ozone Resistance of NR/EPDM Blends via Adjusting Viscosity Ratio August 8. 2016 - The aim of this work is to improve ozone resistance of NR/EPDM blends by adjusting viscosity ratio. Liquid polyisoprene (LIR) and liquid EPDM (LEPDM) are used to adjust the viscosities of NR and EPDM, respectively.
Send Inquiry
2016-11.Improvement of ozone - mahidolrubber.org
ABSTRACT The aim of this work is to improve ozone resistance of NR/EPDM blends by adjusting viscosity ratio. Liquid polyisoprene (LIR) and liquid EPDM (LEPDM) are used to adjust the viscos ities of NR and EPDM, respectively. The obtained results reveal the viscosity ratio plays a significant role.
Send Inquiry
EPDM-rubber in blends with NR/BR-elastomers for ozone
EPDM-rubber in blends with NR/BR-elastomers for ozone-resistant tyre sidewall applications: new approaches for improved mechanical properties EPDM-rubber in blends with NR/BR-elastomers for ozone-resistant tyre sidewall applications: There is still some room for improvement, especially for the visco-elastic properties. But due to the
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Effects of trans鈥恜olyoctylene rubber (TOR)
The ozone resistance of the blends was determined in terms of a critical stress鈥搒train parameter. The critical stored energy density for ozone cracking was significantly enhanced for the TOR containing rubber blend. It was believed that the improvement in ozone resistance arised from finely dispersed ozone鈥恟esistant EPDM particles in the blend.
Send Inquiry
Ozone-resistant natural rubber blends. - Free Online Library
Many papers have been published where the use of modified EPDM to improve ozone resistance of diene rubber blends with EPDM have been described[ref. 14 and 15]. It is suggested that the modified EPDMs provide better dispersion in the NR matrixes or act as cure rate inhibitors to give a more uniform cure rate.
Send InquiryEPDM-Rubber in Blends with NR/BR-Elastomers for Ozone-
Tyre sidewalls generally consist of blends of natural rubber (NR) and butadiene rubber (BR), containing a high concentration of antiozonants to provide ozone resistance. However, the most widely used antiozonant, N-(1, 3-dimethylbutyl)-N鈥?/b>-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environmentally unfriendly substance.
Send InquiryEffect of Viscosity Ratio on Phase Morphology of NR/EPDM
Thus, in the case of NR/EPDM blends, the blend will exhibit ozone resistance if EPDM can be controlled to form continuous phase even though NR might be present in larger proportion.
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