Studies on ethylene‐propylene‐diene rubber modification by N‐chlorothio‐N‐butyl‐benzenesulfonamide

Abstract

N-Chlorothiosulfonamides have been used to modify ethylene-propylene-diene rubber (EPDM) to enhance the compatibility of EPDM in, e.g., natural rubber (NR)/butadiene rubber (BR)/EPDM blends for ozone resistance. N-Chlorothio-N-butyl-benzenesulfonamide (CTBBS) was selected as a representative for N-chlorothiosulfonamides. In this study, we found that CTBBS behaves differently with various types of EPDM. Three types of EPDM were selected: ethylidene norbornene (ENB)-EPDM, hexadiene (HD)-EPDM, and dicyclopentadiene (DCPD)-EPDM. HD-EPDM showed the greatest effectiveness toward CTBBS-modification. However, this EPDM is not commercially available anymore. On the opposite side, DCPD-EPDM showed the lowest reactivity so that almost no modification could be realized. The result with ENB-EPDM was, that upon application of CTBBS to ENB-EPDM, gelation occurred and, therefore, a low amount of modification was achieved. With the limited modification efficiency for ENB-EPDM, there is no significant improvement when applying the modified ENB-EPDM into NR/BR/EPDM blends.

Development of hydroxyapatite nanoparticles reinforced chlorinated acrylonitrile butadiene rubber/chlorinated ethylene propylene diene monomer rubber blends

“…The solvent, oil, and flame resistance of EPDM was significantly improved by the introduction of polar group in the rubber such as chloro functional group 12 . The attachment of functional groups in the macromolecular chain can facilitates the chemical interaction of elastomeric surfaces, which improved the thermodynamic adhesion via increasing the surface free energy 13,14 …”

Blending of NR/BR/ENR/EPDM-g-GMA by reactive processing for tire sidewall applications

“…In all similar suggested procedures, attempts were made to increase the curing rate of EPDM. [4][5][6][7][8][9][10][11] Sahakaro et al 5 investigated the ozone resistance of NR/BR/EPDM and NR/BR blend in two states of conventional straight mixing, and reactive processing techniques. They grafted a common N-cyclohexyl-2-benzothiazole sulfonamide (CBS) onto EPDM prior to blending with NR/BR, to overcome the cure incompatibility in NR/BR/EPDM blends.…”