Effect of the Biopolymer Charge and the Nanoclay Morphology on Nanocomposite Materials

Bertolino, Vanessa; Cavallaro, Giuseppe; Merli, Marcello; Milioto, Stefana; Parisi, Filippo; Sciascia, Luciana

doi:10.1021/acs.iecr.6b01816

Cited by 108 publications

(73 citation statements)

References 60 publications

(117 reference statements)

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“…From Figures 6-11, it can be observed that when the value of effective tensile strain ε e is low, the PNCs behave as linearly elastic solids until the effective tensile strain ε e is close to the yield strain of the polymeric matrix. The effective elastic moduli E e extracted from the present numerical experiments (see Figure 4) are close to those available in the literature [11,12]. In addition, it can also be found from Figures 6-11 that the PNCs exhibit slightly softening behavior prior to the arrival of the yield strain of the polymeric matrix.…”

Section: Resultssupporting

confidence: 85%

“…Among those, the most recent research investigated the effects of nanoclay morphologies (e.g., particle length, aspect ratio, bird nest structure, aggregation, etc. of halloysite and kaolinite nanoclay particles) on the thermal stability, surface wettability, and mechanical properties of biopolymer nanocomposite films for food packaging and other applications [11,12]. The studies showed that the thermal, tensile and surface wetting properties of the pectin resin can be noticeably improved by exfoliated halloysite nanotubes at relatively high weight concentration, which form unique bird nest structures in the pectin matrix of the resulting bionanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Computational Study of the Effects of Processing Parameters on the Nonlinear Elastoplastic Behavior of Polymer Nanoclay Composites

Rahman

2017

J. Compos. Sci.

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Processing parameters (e.g., exfoliation extent and volume fraction) of clay particles in polymeric resins play a crucial role in the mechanical properties of polymer nanoclay composites (PNCs). This paper is aimed to investigate the effects of clay aspect ratio and volume fraction on the global mechanical properties (e.g., effective stiffness, yield strength, and ultimate tensile strength) of PNCs. During the process, computational micromechanics models are adopted to simulate the nonlinear elastoplastic behavior of the PNCs of varying clay particle volume fractions and aspect ratios subjected to uniaxial tension. A representative volume element (RVE) of the PNCs is employed for the finite-element-method (FEM) based computational simulations. The polymeric matrix is treated as an idealized elastoplastic solid with isotropic hardening behavior, and the clay particles are treated as stiff elastic platelets distributed evenly in the stack and stagger configurations in the matrix. Seven volume fractions (V f = 0.5%, 1%, 2%, 5%, 7.5%, 10%, and 15%) and seven aspect ratios (the ratio of platelet length over thickness ρ = 1, 2, 5, 10, 20, 50 and 100) of the reinforcing clay particles are utilized. Numerical experiments show that the effective modulus of the PNCs at small strains increases with the increase of either the clay volume fraction or the platelet aspect ratio largely following those predicted by classic micromechanics models. However, at the low particle aspect ratios (e.g., ρ = 1, 2, 5 and 10), the ultimate tensile strength of the clay composite is nearly independent of the clay volume fraction up to 5% in the present study, i.e., the polymeric matrix governs the PNC strength; at the large particle aspect ratios (e.g., ρ = 20 and 50), the ultimate tensile strength is significantly enhanced with growing clay volume fraction higher than 5% and reaches 150% of that of the polymeric matrix at ρ = 50 and V f = 10%. A comparative study is conducted for stack and stagger models for the prediction of the mechanical properties of PNCs. It shows that the stack model predicts slightly larger values of the effective stiffness and tensile strength than the stagger model. The numerical study shows that a large platelet aspect ratio through full exfoliation of the clay particles in matrix is crucial to achieving the preferable mechanical properties of PNCs as evidenced in experiments. The present results can be utilized to quantitatively explain the mechanical properties of clay particle-reinforced composites and PNCs within the framework of classic micromechanics, and provide guidelines for computer-aided nanocomposites design for processing property-tailorable PNCs.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Computational Study of the Effects of Processing Parameters on the Nonlinear Elastoplastic Behavior of Polymer Nanoclay Composites

Rahman

2017

J. Compos. Sci.

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“…The chemical structure of HNTs shows that the external surface contains siloxane (Si-O-Si) groups, aluminol (Al-OH), and silanol (Si-OH) groups [17,18]. The effect of the biopolymer charge on nanocomposite materials was thoroughly discussed in [19]. HNTs possess a much better dispersion property and potential ability for the formation of hydrogen bonding [20] than other natural silicates such as montmorillonite and kaolinite.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Surface Improvement of Halloysite Nanotubes

et al. 2017

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A novel development on halloysite-polyvinyl alcohol (HNTs-PVA) nanocomposites has been conducted using malonic acid (MA) by crosslinking PVA and HNTs. PVA-MA crosslinking produces smooth surfaces, which play an important role in enhancing the properties of HNTs-PVA nanocomposite. The crystallographic structures of crosslinked HNTs-PVA show almost no change as depicted by the X-ray diffraction (XRD)-2θ-peak, suggesting that MA has no or little influence on the crystallographic structure of the HNTs-PVA. Images taken by field emission scanning electron microscope (FESEM) suggest possible effects of MA on the morphology and internal features of HNTs-PVA by reducing the agglomeration of HNTs, which is considered a decisive step in improving the surface qualities of HNTs. Investigating the samples using the Brunauer-Emmelt-Teller (BET) technique showed that the surface area was increased by about 10 times, reaching the second highest recorded results compared to the HNTs, which could be considered a breakthrough step in enhancing the properties of HNTs-PVA due to MA crosslinking.

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“…Moreover, they have biocompatibility [15] and show no toxicity in vivo [16] and in vitro [17]. These characteristics make HNTs excellent smart materials for the most diverse applications-for example: food packaging [18][19][20], drug delivery [21][22][23][24][25][26], environment remediation and wastewater treatment [27], cultural heritage [28][29][30][31][32], and additives for enhancing the performances of polymers [14,33].…”

Section: Introductionmentioning

confidence: 99%

Stability of Halloysite, Imogolite, and Boron Nitride Nanotubes in Solvent Media

et al. 2018

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Featured Application: The review is focused on the stabilization of nanotubular materials in solvent media. This aspect is a key starting point for any application of nanotube-based formulations for pharmaceutical and industrial applications.Abstract: Inorganic nanotubes are attracting the interest of many scientists and researchers, due to their excellent application potential in different fields. Among them, halloysite and imogolite, two naturally-occurring aluminosilicate mineral clays, as well as boron nitride nanotubes have gained attention for their proper shapes and features. Above all, it is important to reach highly stable dispersion in water or organic media, in order to exploit the features of this kind of nanoparticles and to expand their applications. This review is focused on the structural and morphological features, performances, and ratios of inorganic nanotubes, considering the main strategies to prepare homogeneous colloidal suspensions in various solvent media as special focus and crucial point for their uses as nanomaterials.

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Effect of the Biopolymer Charge and the Nanoclay Morphology on Nanocomposite Materials

Cited by 108 publications

References 60 publications

Computational Study of the Effects of Processing Parameters on the Nonlinear Elastoplastic Behavior of Polymer Nanoclay Composites

Computational Study of the Effects of Processing Parameters on the Nonlinear Elastoplastic Behavior of Polymer Nanoclay Composites

Surface Improvement of Halloysite Nanotubes

Stability of Halloysite, Imogolite, and Boron Nitride Nanotubes in Solvent Media

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