Thermal aging on ethylene–propylene–diene rubber composites reinforced by samarium oxide, samarium borate and Sb in Sb doped SnO₂

Abstract

Ethylene-propylene-diene monomer (EPDM) rubber composites reinforced with 50 phr samarium oxide (Sm 2 O 3 ), samarium borate (SmBO 3 ) and Sb in antimony doped tin oxide (ATO) are aged at 150uC for different intervals. It is found that neutral Sm 2 O 3 and alkaline SmBO 3 can retard the oxidative degradation of EPDM by blocking radical passage. The acidic ATO particles can accelerate the oxidative degradation of EPDM. The trend of tensile strength of EPDM composites is consistent with that of cross-link density of EPDM composites. SmBO 3 and ATO can retard the increase of dielectric loss until 10 days of aging, while Sm 2 O 3 can keep the dielectric loss at low level until 14 days of aging. The increased surface charge of filler can make surface and volume resistivity decrease sharply. Antimony doped tin oxide can deteriorate the dielectric strength of EPDM, while SmBO 3 and Sm 2 O 3 can keep the dielectric strength of EPDM at a constant level.

Reinforced properties of ethylene–propylene–diene monomer composites by vinyltrimethoxysiloxane functionalised barium titanate

“…Thus, it can be regarded as non-conductive materials, meaning that the BaTiO 3 can greatly affect the dielectric properties rather than resistivity of EPDM composites. 35 The threshold of volume resistivity of EPDM composites is 40 vol.-%, which is the same with that of dielectric, rheological and mechanical properties of EPDM composites.…”

“…Thus, it can be regarded as non-conductive materials, meaning that the BaTiO 3 can greatly affect the dielectric properties rather than resistivity of EPDM composites. 35…”

Regulation on the synthesis temperature and optical properties of SmBO3 prepared by chloride fluxes assisted the solid state reaction method

“…Triclinic samarium borate as an orthoborate was also researched for its optical properties. SmBO 3 as a filler has been developed a variety of composite materials [12][13][14][15], and been prepared by solid state reaction method and sol-gel method [16][17][18], which suggests that SmBO 3 possesses excellent optical absorption properties at 1.06 lm near infrared laser. Thus, it can be used as an effective laser stealth absorber to contribute to stealth technology along with the other radar absorbing materials [19][20][21] and infrared stealth materials [22][23] together.…”

Effect of treated mica on rheological, cure, mechanical, and dielectric properties of ethylene propylene diene monomer (EPDM)/barium titanate (BaTiO3)/mica

“…Nonself reinforced ethylene propylene diene monomer (EPDM), with nonpolar and saturated structure, has many advantages, such as high electric resistivity and low dielectric loss . Barium titanate (BaTiO 3 ) with perovskite structure, is a kind of brittle ferroelectric materials, with high dielectric constant .…”