Glycerol: a promising agent for nanodispersion and compatibility of EVA/organomodified montmorillonite nanocomposites

Abstract

*Ethylene-vinyl acetate (EVA) nanocomposites were extruded with two types of organomodified montmorillonite (OMMT) and 1 wt% glycerol. The characterization of the nanocomposites was performed by transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, and dynamic mechanical analysis. The experimental results revealed that glycerol improved the Cloisite 30B clay exfoliation and promoted a rise in aspect ratio of the Cloisite 20A clay. In the rubbery region, the EVA/G showed a higher storage modulus than the EVA, as a result of the network of hydrogen bonds. The entanglements of long chains were more effective in the restrictions of large-scale movements than the chemical interactions. The addition of glycerol promoted greater reinforcement and an increase in the tenacity of the nanocomposites in the glassy region. The use of glycerol for the production of EVA/OMMT nanocomposites was found to be promising.

Preparation and properties of ethylene-vinyl acetate copolymer-based blend foams

“…It is noteworthy that transitions around 44°C were exhibited for all the three foams and were due to the transition of EVA regardless of the types and contents of EVA. 18 –21…”

“…It is noteworthy that transitions around 44 C were exhibited for all the three foams and were due to the transition of EVA regardless of the types and contents of EVA. [18][19][20][21] Damping properties were investigated by measuring DMA. The magnitude of damping can be determined from the dynamic mechanical behavior, in which tan d was used as a measure of damping.…”

Study of the Antibacterial Property of Tea Tree Oil and Its Incorporation Into Poly(Lactic Acid)‐montmorillonite Clay Bionanocomposites

“…This would lead to increased clay dispersion within the polymer matrix. As described in the literature, [21,26] EOs can act as plasticizers, increasing chain mobility by weakening the intermolecular interactions; thus, allowing the penetration of polymer chains into MMT interlamellar space.…”

“…Visentini et al also observed a glycerol addition can decrease agglomeration and increase the intercalation of the clay into the polymer matrix during the mixing process. [26] www.advancedsciencenews.com www.ms-journal.de A synergistic effect occurs when tea tree oil is added to the mixture, as the interplanar distance of (001) diffraction peak are further increased, as show the diffractograms of PLA + MMT + EO10 (Figure 3c), PLA + MMT + EO20 (Figure 3d), PLA + MMT + EO10 + Gly (Figure 3e), and PLA + MMT + EO20 + Gly (Figure 3f) bionanocomposites. Most probably, the effective interaction between clay lamellae and the oil promotes the swelling of the nanofiller stacks.…”

Desenvolvimento e caracterização de bionanocompósitos de poli(ácido) lático e argila montmorilonita incorporados com óleo essencial de melaleuca

“…Além disso, o óleo essencial pode atuar como plastificante no bionanocompósito. Visentini et al (2015) afirma que esse tipo de composto favorece a mobilidade das cadeias poliméricas por meio do enfraquecimento das interações intermoleculares, permitindo assim, a penetração do polímero no espaçamento interlamelar da MMT. Nos difratogramas dos bionanocompósitos de PLA+MMT+OE10 (Figura 14c) e PLA+MMT+OE20 (Figura 15d) nota-se uma forte intensidade no pico (001), o que estaria relacionada com a presença de uma morfologia altamente intercalada e ordenada.…”