Synergistic effect of α‐ZrP and graphene oxide nanofillers on the gas barrier properties of PVA films

Abstract

Two types of 2D nanofillers, α‐zirconium phosphate (α‐ZrP) and graphene oxide (GO), were synthesized and incorporated into poly(vinyl alcohol) (PVA) with 1 wt % loading level at various α‐ZrP:GO (Z:G = 5:1, 2:1, 1:1, 1:2, and 1:5) ratios. The resulting nanocomposites were tested for barrier properties by casting films from solution. The structure and morphology of α‐ZrP and GO were characterized by Fourier‐transform infrared spectroscopy, atomic force microscope, scanning electron microscopy, transmission electron microscopy, and X‐ray diffraction, which demonstrated successful preparation of exfoliated α‐ZrP and GO. The physical characteristics of the nanocomposite films, including thermal, mechanical, and gas barrier properties were investigated. The results indicated that the tensile strength, Young's modulus, and elongation at break of the PVA nanocomposite films with Z:G hybrid nanofiller improved compared to neat PVA. The glass transition temperature, melting temperature, and crystallinity also increased. Consequently there appears to be a synergistic effect with these two types of nanofillers that formed a specific macro structure of a “wall.” This macrostructure resulted in excellent O2 gas barrier properties with the PVA/Z:G‐5:1 nanocomposite films having the best performance. The PO2 of the PVA/Z:G‐5:1 nanocomposite decreased from 1.835 × 10−16 to 0.587 × 10−16 cm3 cm cm−2 s−1 Pa−1 compared with neat PVA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46455.

Antibacterial films with enhanced physical properties based on poly (vinyl alcohol) and halogen aminated‐graphene oxide

“…From Figure , it can be deduced that the π‐π stacking interactions between GP‐Cl nanosheets prevent PVA chains from slipping, which greatly enhances the tensile strength of the hybrid film . (e) Crystallinity of PVA . The crystallinity of PVA was apparently increased with GP‐Cl owing to the “molecule movement restriction” effect (as shown in Table ).…”

“…The extremely great mechanical properties of graphene‐based material could enable it to be a potential reinforcement material . (g) Dispersion of GP‐Cl nanosheets in PVA matrices . GP‐Cl had a stronger effect on mechanical strength when it was well dispersed.…”

“…57 (g) Dispersion of GP-Cl nanosheets in PVA matrices. 59 GP-Cl had a stronger effect on mechanical strength when it was well dispersed. GP-Cl can be well exfoliated and dispersed in PVA matrix at lower concentration.…”

“…48,57,58 (e) Crystallinity of PVA. [58][59][60] The crystallinity of PVA was apparently increased with GP-Cl owing to the "molecule movement restriction" effect (as shown in Table I). GP-Cl may restrict and order the PVA chain arrangement to enhance tensile strength.…”

The State-of-the-Art Functionalized Nanomaterials for Carbon Dioxide Separation Membrane

“…The synergy of multiple nanofillers especially among those with different dimensions can bring about benefits similar to that of functionalization, including enhancing nanofiller dispersion, promoting adhesion with polymer matrix and improving gas selectiveness [164,[261][262][263]. Wong et al [81] and Zhang et al [264] demonstrated that hybridizing CNT with GO could improve the overall stability of the suspension in aqueous solution.…”