Synergistic Effect of EG and Cloisite 15A on the Thermomechanical Properties and Thermal Conductivity of EVA/PCL Blend

Abstract

The purpose of this study was to investigate the synergy of expanded graphite (EG) and Cloisite 15A (C15A) on the thermal conductivity and thermomechanical properties of ethylene-vinyl acetate copolymer/poly (ɛ-caprolactone) (EVA/PCL) blend. Scanning electron microscopy (SEM) results showed that the blend had a phase separation, in which the PCL phase (appeared as droplets) was dispersed uniformly in the EVA matrix in all samples. The results from SEM and X-ray diffraction (XRD) showed that as the EG content increases, graphite sheets increase, leading to a high probability of re-stacking and poor dispersion as well, however the synergy rendered an increase in the storage modulus for the composite containing low content of EG (5phr) in both the EG and clay containing samples. The addition of EG showed a slight increase in thermal stability,but the presence of C15A decreased the onset of degradation of EVA/PCL blend. However, at high temperatures the synergistic effect of EG and C15A showed better thermal stability for EVA/PCL blend than EG alone. The addition and increase in EG content improved thermal conductivity of the EVA/PCL blend in both the clay containing and EG containing samples, however the clay-containing samples showed lower values compared to EG only.

Two‐way multi‐shape memory properties of peroxide crosslinked ethylene vinyl‐acetate copolymer (EVA)/polycaprolactone (PCL) blends

“…To consider the merit of commercial cost‐competitive polymers in contrast to expensive and complex interpenetrating networks, there have been some developments on the neat crosslinked SMPs like crosslinked EVA, PCL, and EVA/PCL blends recently, because of their low melting transition temperatures. However, rare studies have investigated on the 2‐way shape memory crosslinked blends with multiple shape memory behavior up to date, even though there were some studies on the blends of EVA and PCL in various properties . Kolesov et al conducted an investigation of the morphology effect on 2‐way multi‐shape memory behavior in several binary melt‐blends, including crosslinked polyethylene (PE)/ethylene‐octene copolymer, PE/PCL, and PE/polycyclooctene blends, which suggested that the triple‐SM behavior was more distinct when a continuous phase of blend had lower crystallization/melting temperatures in comparison with the dispersed phase.…”

“…However, rare studies have investigated on the 2-way shape memory crosslinked blends with multiple shape memory behavior up to date, even though there were some studies on the blends of EVA and PCL in various properties. [28][29][30][31] Kolesov et al 32,33 conducted an investigation of the morphology effect on 2-way multi-shape memory behavior in several binary melt-blends, including crosslinked polyethylene (PE)/ethyleneoctene copolymer, PE/PCL, and PE/polycyclooctene blends, which suggested that the triple-SM behavior was more distinct when a continuous phase of blend had lower crystallization/melting temperatures in comparison with the dispersed phase. Unfortunately, the selective resins had different crosslinking degrees, which posed a difficulty in understanding the detail contribution of respective crystallization effect at the similar crosslinking degree for different resins.…”

Properties of Compatible Soy Protein Isolate/Polycaprolactone Composite with Special Interface Structure

“…Figure shows the WXRD spectra of S50P50 and S45P45PUP10 composites. From the figure, three sharp and strong peaks at 21.4°, 22°, and 23.7° corresponding to the typical crystallization of PCL could be observed for the SPI‐PCL composites. The crystallization of PUP was overlapping with that of PCL according to the conclusion of Choi et al .…”

The effect of expanded graphite/clay nanoparticles on thermal, rheological, and fire‐retardant properties of poly(butylene succinate)

“…[28,29] The combination of MMT and EG has been studied in the literature. [29,30] Tsotetsi et al [30] reported that it was not the presence of clay improved the dispersion of EG due to strong interaction between polar vinyl acetate groups in ethylene vinyl acetate (EVA) chains and the organic modifier in the clay. They pointed out that the Cloisite 15A clay nanoparticles accelerated the deacetylation of EVA and degradation of polycaprolactone (PCL) due to the decomposition of the alkylammonium cations which catalyze the degradation of the polymers.…”