Effect of sol–gel derived nano-silica and organic peroxide on the thermal and mechanical properties of low-density polyethylene/wood flour composites

Mishra, Ajay Kumar; Luyt, A. S.

doi:10.1016/j.polymdegradstab.2007.11.006

Cited by 24 publications

(11 citation statements)

References 32 publications

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“…The bands at 719 cm −1 (balance of methylene group sequences), 1369 cm −1 (C–H flexion of methyl groups), 1461 cm −1 (C–H folding of methylene groups), 2848 cm −1 (C–H stretching), and 2916 cm −1 (methylene stretching) corroborate the characteristic LDPE peaks (Mishra and Luyt, 2008; Olmos et al., 2012; Rajandas et al., 2012).…”

Section: Resultssupporting

confidence: 61%

Low-density polyethylene films incorporated with silver nanoparticles to promote antimicrobial efficiency in food packaging

Brito

Bresolin

Sivieri

et al. 2019

Food sci. technol. int.

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Technological innovations in packaging are intended to prevent microbiological contaminations for ensuring food safety and preservation. In this context, researchers have investigated the antimicrobial effect of low-density polyethylene films incorporated with the following concentrations of silver nanoparticles: 1.50, 3.75, 7.50, 15.00, 30.00, 60.00, and 75.00 µg/ml. The films were characterized using field emission gun scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetry, and differential scanning calorimetry. From the results of these techniques, it could be concluded that the silver nanoparticles incorporated in the low-density polyethylene films did not influence their physical, chemical, and thermal properties. The direct contact assays, shake-flask assays, and bacterial images obtained using scanning electron microscopy were used to analyze the antimicrobial activity of the films. In the microbial analyses, it was verified that the nanostructured films exhibited antimicrobial properties against all the microorganisms studied, although more notably for fungi and Gram-negative bacteria than the Gram-positive bacteria. Moreover, it was discovered that the packages, in which silver nanoparticles were incorporated, inhibited the growth and reproduction of bacterial cells during the early stages. These results suggest that the extruded low-density polyethylene films incorporated with silver nanoparticles may be an essential tool for improving food quality and safety.

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Section: Resultssupporting

confidence: 61%

Low-density polyethylene films incorporated with silver nanoparticles to promote antimicrobial efficiency in food packaging

Brito

Bresolin

Sivieri

et al. 2019

Food sci. technol. int.

View full text Add to dashboard Cite

show abstract

“…Figure c shows the FTIR spectra of the reactively extruded PLA/CNC nanocomposites in the presence of different inorganic nanofillers (evident from distinct FTIR peaks), which are found to inhibit the gel fraction yield, but with molecular properties comparable to PLA. The presence of nanosilica and montmorillonite are evident from the low-intensity peaks in the ∼1126 and 800 cm –1 region, representing the Si–OH bond stretching and Si–O symmetric stretching, respectively. , Both alumina and CNFs shows the representative peaks of PLA with greater intensity, probably due to higher gel yield and molecular weight properties (as explained earlier). PLA/DCNC-S/Alumina shows the representative peak of Al–O–Al at 752 cm –1 and the C–C peak formed due to reactive grafting between PLA/CNCs shifted to 980 cm –1 .…”

Section: Resultsmentioning

confidence: 71%

Reactive Extrusion of Polylactic Acid/Cellulose Nanocrystal Films for Food Packaging Applications: Influence of Filler Type on Thermomechanical, Rheological, and Barrier Properties

Dhar

Gaur

Soundararajan

et al. 2017

Ind. Eng. Chem. Res.

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In this study, we successfully demonstrate single-step industrially scalable reactive extrusion of polylactic acid (PLA)/ cellulose nanocrystal (CNC)-based cast films which leads to reduced necking, improved processability, melt strength, and rheological behavior. PLA chains grafted onto CNCs, formed cross-linked gel-like structures of high molecular weight (M w ≈ 150−245 kDa), with varying grafting efficiency (14%−67%) or gel-fraction yield (16%− 69%), depending on the type of compatibilizers used. The reactively processed films show reduction in both oxygen properties (20%− 65%) and water vapor barrier properties (27%−50%), along with improved thermomechanical properties. These films finds potential applications for the storage of oil-and dairy-based products, which show shelf lives of ∼5 months and ∼2 weeks, respectively, and are within the standard migration limits, as per the set legislations. Therefore, the present study provides a novel, easily processable extrusion-based approach for manufacturing sustainable PLA/ CNC-based green and eco-friendly films with improved recyclability, biodegradability, and nontoxicity for potential applications as food packages on a commercial scale.

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“…A complete in situ synthesis of silica sol-gel could be achieved by using an excess water and/or the use of chemical catalysts such as butylamine, fluoride, and ammonium hydroxide [ 32 , 34 ]. High molar ratio of water to TEOS (≥4) would be sufficient to drive toward a complete conversion of silica [ 35 ]. Instead, an early stage of partial reversible hydrolysis could occur, leading to alcohol and water condensations to form siloxane bonds ( Figure 1 ).…”

Section: Introductionmentioning

confidence: 99%

“…However, there are rarely any studies that have been conducted on the synthesis of polymeric composite reinforced with modified OPF with sol-gel silica. Utilization of silica produced via sol-gel process for lignocellulosic fibre in thermoplastics showed that the dispersion of silica nano particle size 10–50 nm through sol-gel in the matrix shows improvement in the tensile modulus and thermal stability of LDPE-based composites [ 35 ]. It is also stated that the sol-gel process improves the dispersion of filler and adhesion to hydrophobic matrix such as polyethylene and reaction speed is controllable.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Mechanical and Thermal Properties of Modified Oil Palm Fiber-Reinforced Polypropylene Composite via Multi-Objective Optimization of In Situ Silica Sol-Gel Synthesis

et al. 2021

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A multi-objective optimization of in situ sol-gel process was conducted in preparing oil palm fiber-reinforced polypropylene (OPF-PP) composite for an enhancement of mechanical and thermal properties. Tetraethyl orthosilicate (TEOS) and butylamine were used as precursors and catalysts for the sol-gel process. The face-centered central composite design (FCCD) experiments coupled with response surface methodology (RSM) has been utilized to optimize in situ silica sol-gel process. The optimization process showed that the drying time after the in-situ silica sol-gel process was the most influential factor on silica content, while the molar ratio of TEOS to water gave the most significant effect on silica residue. The maximum silica content of 34.1% and the silica residue of 35.9% were achieved under optimum conditions of 21.3 h soaking time, 50 min drying time, pH value of 9.26, and 1:4 molar ratio of TEOS to water. The untreated oil palm fiber (OPF) and silica sol-gel modified OPF (SiO2-OPF) were used as the reinforcing fibers, with PP as a matrix and maleic anhydride grafted polypropylene (MAgPP) as a compatibilizer for the fiber-reinforced PP matrix (SiO2-OPF-PP-MAgPP) composites preparation. The mechanical and thermal properties of OPF-PP, SiO2-OPF-PP, SiO2-OPF-PP-MAgPP composites, and pure PP were determined. It was found that the OPF-S-PP-MAgPP composite had the highest toughness and stiffness with values of tensile strength, Young’s modulus, and elongation at break of 30.9 MPa, 881.8 MPa, and 15.1%, respectively. The thermal properties analyses revealed that the OPF-S-PP-MAgPP exhibited the highest thermally stable inflection point at 477 °C as compared to pure PP and other composites formulations. The finding of the present study showed that the SiO2-OPF had the potential to use as a reinforcing agent to enhance the thermal-mechanical properties of the composites.

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Effect of sol–gel derived nano-silica and organic peroxide on the thermal and mechanical properties of low-density polyethylene/wood flour composites

Cited by 24 publications

References 32 publications

Low-density polyethylene films incorporated with silver nanoparticles to promote antimicrobial efficiency in food packaging

Low-density polyethylene films incorporated with silver nanoparticles to promote antimicrobial efficiency in food packaging

Reactive Extrusion of Polylactic Acid/Cellulose Nanocrystal Films for Food Packaging Applications: Influence of Filler Type on Thermomechanical, Rheological, and Barrier Properties

Enhanced Mechanical and Thermal Properties of Modified Oil Palm Fiber-Reinforced Polypropylene Composite via Multi-Objective Optimization of In Situ Silica Sol-Gel Synthesis

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