Role of poly(ethylene glycol) grafted silica nanoparticle shape in toughened PLA-matrix nanocomposites

Xia, Shuang; Liu, Xiaobing; Wang, Jianfeng; Kan, Ze; Chen, Hong; Fu, Wenxin; Li, Zhibo

doi:10.1016/j.compositesb.2019.03.050

Cited by 37 publications

(18 citation statements)

References 58 publications

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“…In this case, the %E of the PLA/SeMP composite film showed a tendency of first improvement and then deterioration. The trend noted for the %E might mainly be attributable to the particle shape [59]. When the mass fraction of SeMPs was 1%, the best %E of 181.70% ± 20.51% was noted.…”

Section: Tensile Propertiesmentioning

confidence: 90%

Development of Polylactic Acid Films with Selenium Microparticles and Its Application for Food Packaging

et al. 2020

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Selenium is a natural element which exists in the human body and plays an important role in metabolism. Along with this, selenium also possesses antibacterial and antioxidant properties. Using selenium microparticles (SeMPs) in food packaging films is exceptional. In this experiment, a solution casting method was used to make film. For this purpose, we used polylactic acid (PLA) as a substrate for the formation of a film membrane while SeMPs were added with certain ratios to attain antibacterial and antioxidant properties. The effects of SeMPs on the PLA film and the value of SeMPs in food packaging film production were investigated. The effects of the SeMPs contents on the features of the film, such as its mechanical property, solubility, swelling capacity, water vapor permeability, antioxidant activity, and the antibacterial activity of the composite membrane against Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative) strains, were studied. The results manifest that the PLA/SeMPs films showed higher water resistance, UV resistance, antioxidant activity, and antibacterial activity than pure PLA film. When the concentration of SeMPs was 1.5 wt%, the composite membrane showed the best comprehensive performance. Although the tensile strength and elongation at break of the membrane were slightly reduced by the addition of SeMPs, the results show that PLA/SeMPs films are still suitable for food packaging and would be a very promising material for food packaging.An important reason behind the need for food packaging with antibacterial properties is the ever-growing issue of increasing foodborne microorganisms, which necessitates higher requirements for the functionality of food packaging that ensures the retention of the food quality [12]. The PLA membrane has no antimicrobial property. The incorporation of nanomaterials (nano-metals, nano-cellulose, nano-clay and so on) improves the properties and helps to obtain antibacterial activity, prevent ultraviolet radiation and other additional functional properties [13]. In this regard, metal nanoparticles such as those of titanium, silver, and zinc have been found to improve the antimicrobial activity of biodegradable polymer films [14][15][16]. Some studies have shown the successful incorporation of nanoparticles in the PLA films to enhance the properties of films. Athanasoulia et al. [17] made the TiO 2 /PLA membrane by extrusion melt blending and investigated the influence of the incorporation of TiO 2 nano particles on the performance and features of a brittle crystalline poly-matrix. They found that a 20/80 w/w TiO 2 /PLA nanocomposite offered favorable bacteriostatic effects both under UV light and in the dark. Shebi et al. [18] prepared the honeycomb membrane by using the breath figure method. This study explained that the nanomaterials (H-PLA/GST) showed obvious bacteriostatic properties to S. aureus, both in visible light and in dark conditions. Munteanu et al. [19] used the electrostatic spinning method to mix polylactic acid (PLA), silver ...

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Section: Tensile Propertiesmentioning

confidence: 90%

Development of Polylactic Acid Films with Selenium Microparticles and Its Application for Food Packaging

et al. 2020

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“…By incorporating nanoclay platelets, besides the gas permeability reduction, one can also expect promising mechanical properties for nanocomposite. [3,25] Mainly, diffusivity and solubility are two parameters in permeation characteristics that are kinetic and thermodynamic parameters; relating to the gas mobility through the filler and the gas solubility in filler/polymer of the filler-polymer interface. [18,20] The interfacial adhesion between filler and polymer is another factor which can affect the gas permeation.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical and Experimental Analysis of the Effect of Nanoclay on Gas Perm‐Selectivity of Biodegradable PLA/EVA Blends in the Presence and Absence of Compatibilizer

Karimpour‐Motlagh

Moghadam

Khonakdar

et al. 2020

Macro Materials & Eng

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Poly (lactic acid) (PLA)‐based compounds are widely used in thin‐film and food packaging industries. Herein, PLA/ethylene vinyl acetate copolymer (EVA)/nanoclay nanocomposites are prepared in various compositions by melt blending. The gas permeability against N2, CO2, and O2 gases is determined as a function of composition and morphology of the nanocomposites. Inclusion of high aspect ratio of platelet‐like nanoclay to the blend reduces the gas diffusion. The best barrier properties against all gases is observed on introducing 5 wt% poly(ethylene/n‐butyl acrylate glycidyl methacrylate) copolymer as compatibilizer to the PLA/EVA/nanoclay (75/25/5) system. The scanning and transmission electron microscopic analyses and wide‐angle X‐ray scattering studies reveal that inclusion of compatibilizer to the filled‐blends improves the blend morphology, dispersion state, and intercalation level of clay platelets which are preferably localized at the interface of the blend. Analysis of selectivity parameter (α) shows the lowest O2 permeability and the highest αCO2/N2 and αO2/N2 values for the compatibilized filled‐blend (75/25/5/5). In situ aspect ratio of clay and the degree of intercalation are theoretically evaluated based on the permeability data using various empirical models. It is found that the compatibilized filled‐blend has the highest aspect ratio and intercalation level that are responsible for the optimum perm‐selectivity performance.

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“…Compared with organic toughening agents, inorganic nanoparticles 18,19 have larger specific surface areas, more defects and more surface atoms, which could combine closely with UF and PF polymer matrix, and improve the ability of UF and PF to bear larger load. More importantly, nanoparticles can pass external stress effectively and absorb a great deal of energy under the external force 20–22 . Thus, inorganic nanoparticle materials have attracted extensive attention for improving the toughness of foams for the past few years.…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, nanoparticles can pass external stress effectively and absorb a great deal of energy under the external force. [20][21][22] Thus, inorganic nanoparticle materials have attracted extensive attention for improving the toughness of foams for the past few years. Li et al 23 reported the compressive strength, compressive modulus, and tensile strength of PF were increased 47.37, 38.55, and 57.14% after adding silica nanoparticles, respectively.…”

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confidence: 99%

Preparation and properties of nano ZnO toughed phenol–urea‐formaldehyde foam

Wang

Zheng

et al. 2020

J of Applied Polymer Sci

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Urea formaldehyde (UF) and phenol formaldehyde (PF) foam possess outstanding flame-retardant properties, excellent insulation, and low thermal conductivity. These properties make them suitable for thermal insulation in buildings. However, the mechanical properties still need to be improved. In this study, orthogonal test was designed to optimize the level components of PF/UF composite foam first, then nano ZnO was added to the PF/UF composite foam to improve its toughness. The effects of nano ZnO on the morphology, apparent density, pulverization rate, thermal conductivity and thermal degradation property, flame retardancy, and mechanical properties of the ZnO/PF/UF nanocomposite foam were studied. The addition of nano ZnO improved the bending and compressive strength and decreased the pulverization rate of the composite foam significantly. The ZnO/PF/UF nanocomposite foam also presented better flame retardant properties than PF/UF composite foam. The largest oxygen index values of ZnO/PF/UF nanocomposite foam could reach 39.31%, while the thermal conductivity and the maximum rate of weight loss temperature were increased to 0.036 W/(mÁK) and 279 C, respectively. Moreover, ZnO/PF/UF nanocomposite foam showed low apparent density property (0.27 g/cm 3). K E Y W O R D S composites, foams, mechanical properties, nanoparticles, thermosets 1 | INTRODUCTION At present, the thermal insulation materials used in building mainly include organic thermal insulation materials and inorganic thermal insulation materials. Organic insulation material (polymer foam material) is a microporous material made from polymer matrix filled with gas, which presents low density, low water absorption, high porosity, and excellent insulation performance. 1-3 Thus, it is widely used in the construction industry owing to excellent flame retardancy, chemical resistance, environmental friendly, thermal insulation, low price, and low water absorption. Urea formaldehyde (UF) foam and phenol formaldehyde (PF) foam has been extensively promoted as the most suitable alternative for thermal insulation building materials. 4-8 However, UF foam lacks active functional groups, thus, it always presents high brittleness, high pulverization ratio, low strength, and toughness. Meanwhile, PF foam also suffers from some mechanical weaknesses. For these reasons, it is necessary to focus on the improvement of PF/UF composite foam mechanical properties, such as, compressive and bending strength, friability and pulverization rate, while still maintaining their excellent flame retardant properties. In general, the toughness of foams can be improved by two methods: the physical method and the chemical

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Role of poly(ethylene glycol) grafted silica nanoparticle shape in toughened PLA-matrix nanocomposites

Cited by 37 publications

References 58 publications

Development of Polylactic Acid Films with Selenium Microparticles and Its Application for Food Packaging

Development of Polylactic Acid Films with Selenium Microparticles and Its Application for Food Packaging

A Theoretical and Experimental Analysis of the Effect of Nanoclay on Gas Perm‐Selectivity of Biodegradable PLA/EVA Blends in the Presence and Absence of Compatibilizer

Preparation and properties of nano ZnO toughed phenol–urea‐formaldehyde foam

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