We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Combined effect of VA content and pH level of filler on properties of EPDMSmBO3and EPDMATO composites reinforced by three types of EVA.
- Authors
Jun Su; Shuangjun Chen; Jun Zhang; Zhongzi Xu
- Abstract
This study investigates the interaction of vinyl acetic VA content of ethylenevinyl acetate EVA, pH level of Samarium borate SmBO3, and Sbdoped SnO2ATO on reinforcement of peroxidecured ethylenepropylenediene rubber EPDMSmBO3and EPDMATO composites. It was found that EVA could both reinforce mechanical properties of EPDM, and enhance fluidity of gum during processing. During vulcanization, the interaction of VA groups and pH value of filler particles can influence the crosslink density of EPDM composites. In alkaline EPDMSmBO3EVA, VA groups could hydrolyze to produce polyvinyl alcohol and reduce pH level of medium by consuming OH−. When dispersed in acidic EPDMATOEVA, VA groups could generate polyunsaturated bonds and acetic acid during vulcanization. The double bonds could react with dicumyl peroxide DCP and then boost crosslink efficiency of EPDM composites. Moreover, acetic acid and reduction of pH value could make DCP decompose into ions, and lower crosslink density of EPDM composites. In addition to the contribution of crosslink density, EVA could crystallize in EPDM composites to reinforce EPDM composites. Electric properties of EPDM were also affected. Surface and volume resistivity of EPDM composites decreased with the rise of VA content. As for EPDMSmBO3EVA composites, the growth of VA groups could boost dielectric constant and loss, decrease dielectric strength, due to the enhancement of polarity and reduction of crosslink density. In terms of EPDMATOEVA composites, the EPDMATOEVA14 possesses the highest dielectric constant and loss, and the lowest dielectric strength, because of the competing effect of VA content and crosslink density. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
- Subjects
REINFORCEMENT of rubber; HYDROGEN-ion concentration; VINYL acetate; SAMARIUM; VULCANIZATION; MONOMERS; DIELECTRICS; MECHANICAL properties of polymers
- Publication
Journal of Applied Polymer Science, 2010, Vol 117, Issue 3, p1741
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.32106