Optimization of Electrical Conductivity, Dielectric Properties, and Stress Relaxation Behavior of Conductive Thermoplastic Vulcanizates Based on ENR/COPA Blends by Adjusting Mixing Method and Ionic Liquid Loading

Abstract

Conductive thermoplastic vulcanizates based on epoxidized natural rubber (ENR) and copolyamide (COPA) blends were prepared using two alternative mixing stages to incorporate MWCNTs: after or before dynamic vulcanization (i.e., ADV or BDV, respectively). Effects of ionic liquid (IL) loading on properties of the blends were also studied. The results indicated that both ADV and BDV mixing preferentially localized MWCNTs in the COPA phase. However, with BDV mixing some of the MWCNTs also resided in ENR domains. The TPVs made with BDV showed higher electrical conductivity, dielectric properties, and superior stress relaxation behavior relative to those prepared by ADV. This might be due to better dispersion of MWCNTs in both phases of the blends. In addition, the electrical and dielectric properties were improved by the IL in a dose dependent manner with the IL loading. However, the IL reduced stress relaxation of the TPVs due to its plasticizing effect.

Influence type of natural rubber on properties of green biodegradable thermoplastic natural rubber based on poly(butylene succinate)

“…The first peak at about 60°C might be attributed to chemical linkages between nonrubber components (ie, proteins and fatty acids) in NR that cause storage hardening . Also, the physical interactions of polar moieties in rubber might contribute to the first peak . The second relaxation peak in the temperature range 120°C to 140°C might be due to the degradation of linkages in rubber phase and scission of polymer main chains together with the opening of oxirane rings.…”

“…[59][60][61] Also, the physical interactions of polar moieties in rubber might contribute to the first peak. 62 The second relaxation peak in the temperature range 120°C to 140°C might be due to the degradation of linkages in rubber phase and scission of polymer main chains together with the opening of oxirane rings. In Figure 13B and Table 9, it is also seen that the ENR-50/PBS simple blend had higher T 10 than the ENR-25/PBS or NR/PBS simple blends.…”

Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube

“…Most of these systems involve polypropylene (PP)/ethylene‐propylene‐diene rubber loaded with conductive carbon black (CB), 10–14 expanded graphite, 15,16 and carbon nanotube (CNT) 17–19 . Other few examples of conductive TPV include poly(vinylidene fluoride)/epoxidized natural rubber (ENR) loaded with CB, 20 copolyamide (COPA)/ENR loaded with CNT, 21 and linear low‐density polyethylene/reclaimed rubber with CNT 22 …”

Effect of blend ratio and compatibilisation on the electrical and dielectric properties of nylon copolymer (6, 66)/EPDM rubber blends

“…Faez et al studied the conductivity of the EPDM and polyaniline blends and effect of different crosslinking methods on the conductivity. Matchawet et al studied the electrical and dielectric properties and stress relaxation behavior of ENR/COPA‐blend composites. Otero‐Navas et al studied the effect of multiwalled carbon nanotube on the dielectric properties of polypropylene/polystyrene blends.…”