Effect of Silica Nanoparticles on Properties of Coatings Based on Acrylic Emulsion Resin

Effect of nanosilica size on physic-mechanical properties, thermal stability and weathering durability of coating based on acrylic emulsion. Nanocomposite coating formulas were filled by 2 wt.% nanosilica particles which were used in this study, namely: nanosilica from Sigma (15-20nm), nansilica from rice husk (~70-200 nm) and nanosilica from Arosil – Belgium (7-12 nm). Obtained results showed that viscosity flow of coating formula containing nanosilica from Arosil saw the highest flow-time while coating formulas filled other nanosilica and unfilled nanosilica experienced similar flow-time. In presence of nanosilica, coating properties were improved in comparison with neat coating. However, coating filled by nanosilica from rice husk indicated the best properties in studied coating formula. It may explained that size of nanosilica from rice husk was the largest in studied nanosilica particles and thus easily dispersing into coating formula.

Download Full-text

The Influence of Alkaline Treatment on Mechanical Properties and Morphology of Rice Husk Fibre Reinforced Polylactic Acid

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.911.13 ◽

2014 ◽

Vol 911 ◽

pp. 13-17 ◽

Cited By ~ 1

Author(s):

Abdullah Farah Dina ◽

Sa’ad Siti Zaleha ◽

Bonnia Noor Najmi ◽

Ibrahim Nor Azowa

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Brittle Fracture ◽

Polylactic Acid ◽

Rice Husk ◽

Alkaline Treatment ◽

Distilled Water ◽

Internal Mixer ◽

Fesem Micrographs ◽

Thermal Stability Of

This study focuses on the influence of surface treatment and fibre sizes on mechanical behavior, physical properties and morphology of rice husk fibre (RHF) reinforced polylactic-acid (PLA). Modified RHF was prepared by using 6w.t.% sodium hydroxide (NaOH) and distilled water. PLA composite reinforced with 25w.t.% volume fractions of modified RHF was mixed using the internal mixer and fabricated by the mini injection moulding. Tensile and flexural strength results showed that the PLA composite with 100, 200 and 500μm particles sizes of water treated fibre are much higher than those of alkaline treated. DSC measurement was performed and indicated that the Tg,Tmand ΔHmof PLA reduced after reinforcement with water treated and alkaline treated fibres. TGA results showed that the treatment reduced the thermal stability of the PLA. FESEM micrographs for flexural fractured surfaces of composites showed micro crack and pores due to brittle fracture of the PLA matrix adjacent to the fibre as a result of the brittle nature of the PLA resin.

Download Full-text

Tailoring the Mechanical Performance of Epoxy Resin by Various Nanoparticles

Polymers and Polymer Composites ◽

10.1177/096739110801600806 ◽

2008 ◽

Vol 16 (8) ◽

pp. 527-533 ◽

Cited By ~ 2

Author(s):

Sheng Liu ◽

Hui Zhang ◽

Zhong Zhang ◽

Taihua Zhang ◽

Stephan Sprenger

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Tensile Strength ◽

Epoxy Resin ◽

Silica Nanoparticles ◽

Mechanical Performance ◽

Sol Gel ◽

Nanoparticle Dispersion ◽

Nanosilica Particles ◽

The Cost

Flexible organic elastomeric nanoparticles (ENP) and two kinds of rigid inorganic silica nanoparticles were dispersed respectively into a bisphenol-A epoxy resin in order to tailor and compare the performance of mechanical properties. It was found that the well-dispersed flexible ENP greatly enhanced the toughness of the epoxy with the cost of modulus and strength. Comparatively, the rigid silica nanoparticles improved Young's modulus, tensile strength and fracture toughness simultaneously. Both fumed and sol-gel-formed nanosilica particles conducted similar results in reinforcing the epoxy resin, although the latter exhibited almost perfect nanoparticle dispersion in matrix. The toughening mechanisms of nanocomposites were further discussed based on fractographic analysis.

Download Full-text

Mechanical Properties of Rice-Husk Cement Composites Modified by SAE

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.71-78.3470 ◽

2011 ◽

Vol 71-78 ◽

pp. 3470-3473 ◽

Cited By ~ 1

Author(s):

De Sheng Xiong ◽

Fu Qin Han ◽

Mo Chen

Keyword(s):

Mechanical Properties ◽

Electron Microscope ◽

Rice Husk ◽

Mechanical Test ◽

Alkali Treatment ◽

Cement Composites ◽

Acrylic Emulsion ◽

Effective Additive ◽

Scanning Electron ◽

Material Standard

Cement-based composites were prepared from rice husk and styrene-acrylic emulsion (SAE) with semi-dry production process. The volume of SAE, the rice husk content and alkali treatment on the properties of the composites were studied. Particle-matrix bonding were observed with scanning electron microscope (SEM). The mechanical test of the rice-husk cement composites proved that SAE is an effective additive for reinforcing the composites, the mechanical properties improved significantly by alkali treatment and adding SAE. the properties can meet the requirement of the china building material standard(JC411—2007) when the content of SAE reached 3%.

Download Full-text

Mechanical and Thermal Properties of Montmorillonite-Reinforced Polypropylene/Rice Husk Hybrid Nanocomposites

Polymers ◽

10.3390/polym11101557 ◽

2019 ◽

Vol 11 (10) ◽

pp. 1557 ◽

Cited By ~ 8

Author(s):

Khaliq Majeed ◽

Ashfaq Ahmed ◽

Muhammad Saifullah Abu Bakar ◽

Teuku Meurah Indra Mahlia ◽

Naheed Saba ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Thermal Properties ◽

Rice Husk ◽

Hybrid Nanocomposites ◽

Commercial Application ◽

Mechanical And Thermal Properties ◽

Melt Mixing ◽

Compatibilizing Agent ◽

Thermal Stability Of

In recent years, there has been considerable interest in the use of natural fibers as potential reinforcing fillers in polymer composites despite their hydrophilicity, which limits their widespread commercial application. The present study explored the fabrication of nanocomposites by melt mixing, using an internal mixer followed by a compression molding technique, and incorporating rice husk (RH) as a renewable natural filler, montmorillonite (MMT) nanoclay as water-resistant reinforcing nanoparticles, and polypropylene-grafted maleic anhydride (PP-g-MAH) as a compatibilizing agent. To correlate the effect of MMT delamination and MMT/RH dispersion in the composites, the mechanical and thermal properties of the composites were studied. XRD analysis revealed delamination of MMT platelets due to an increase in their interlayer spacing, and SEM micrographs indicated improved dispersion of the filler(s) from the use of compatibilizers. The mechanical properties were improved by the incorporation of MMT into the PP/RH system and the reinforcing effect was remarkable as a result of the use of compatibilizing agent. Prolonged water exposure of the prepared samples decreased their tensile and flexural properties. Interestingly, the maximum decrease was observed for PP/RH composites and the minimum was for MMT-reinforced and PP-g-MAH-compatibilized PP/RH composites. DSC results revealed an increase in crystallinity with the addition of filler(s), while the melting and crystallization temperatures remained unaltered. TGA revealed that MMT addition and its delamination in the composite systems improved the thermal stability of the developed nanocomposites. Overall, we conclude that MMT nanoclay is an effective water-resistant reinforcing nanoparticle that enhances the durability, mechanical properties, and thermal stability of composites.

Download Full-text

Microstructure, thermal stability, and mechanical properties of modified polycarbonate with polyolefin and silica nanoparticles

Polymers for Advanced Technologies ◽

10.1002/pat.4064 ◽

2017 ◽

Vol 28 (12) ◽

pp. 1794-1803 ◽

Cited By ~ 7

Author(s):

Iman Taraghi ◽

Abdolhossein Fereidoon ◽

Sandra Paszkiewicz ◽

Anna Szymczyk ◽

Renata Chylinska ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Silica Nanoparticles

Download Full-text

The influence of silica nanoparticles on thermal degradation and mechanical properties of nanocomposites based on aliphatic polyurethanes

Hemijska industrija ◽

10.2298/hemind170829014p ◽

2018 ◽

Vol 72 (4) ◽

pp. 215-227

Author(s):

Jelena Pavlicevic ◽

Milena Spirková ◽

Oskar Bera ◽

Mirjana Jovicic ◽

Dejan Kojic ◽

...

Keyword(s):

Mechanical Properties ◽

Activation Energy ◽

Thermal Stability ◽

Thermal Degradation ◽

Silica Nanoparticles ◽

Degradation Mechanism ◽

Building Blocks ◽

Silica Content ◽

Single Step ◽

Onset Temperature

Nanocomposites based on aliphatic polyurethanes have recently attracted a lot of attention regarding economical and ecological aspects, due to their improved thermal and mechanical properties. The aim of this paper was to investigate the influence of silica nanoparticles, differing in size and specific surface, on thermal stability and degradation, lifetime and mechanical characteristics of the obtained nanocomposites. Two series of nanocomposites based on aliphatic polyurethanes were obtained by using a single-step procedure and by addition of silica nanoparticles of types A380 or N999 at different loadings (0,0 0.15, 0.5, 1,0 and 3.5 wt.%). It was found that the increase in heating rate caused shifting of the onset temperature to higher values (from 283 to 312 ?C). According to the shape of DTG curves, it was observed that the degradation mechanism of prepared nanocomposites consists of two overlapping processes, related to the scission of hard and soft building blocks. Based on DTG results, the addition of larger N999 silica nanoparticles induced lower thermal degradation, shifting the maximum rate temperatures of the first and second degradation stages to lower values, and caused the change in the degradation mechanism. Addition of smaller silica nanoparticles (A380) did not significantly affect the mechanism of the degradation reaction, indicating homogeneity of the obtained nanocomposites. The presence of A380 nanoparticles improved thermal stability of nanocomposites, by increasing the onset temperature from 286 ?C for the pristine elastomer to 303 ?C for the sample containing 3.5 wt.% of silica. Existence of interactions of A380 silica nanoparticles with hard and soft phases was observed, based on the increase in the maximum rates of the first and second degradation steps. The activation energy of thermal degradation of polyurethanes modified with A380 silica nanoparticles was obtained by using the Flyn-Wall and Toop models. Dependence of the activation energy and the lifetime of nanocomposites based on aliphatic polyurethanes on the silica content were estimated. The highest Ea values (determined for 1 and 5 % weight loss) were found for nanocomposites containing 0.5 and 0.15 wt. % of A380 silica nanoparticles (121 and 161.2 kJ/mol). A negative effect of the silica addition on mechanical properties of nanocomposites was observed. The polyurethanes containing smaller SiO2 particles (A380) had a higher tensile strength, elongation at break and hardness as compared to the elastomers filled with larger silica nanoparticles (N999).

Download Full-text

Microstructure And Properties Of WC-Co HVAF Coatings Obtained From Standard, Superfine And Modified By Sub-Micrometric Carbide Powders

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0203 ◽

2015 ◽

Vol 60 (2) ◽

pp. 759-766 ◽

Cited By ~ 4

Author(s):

H. Myalska ◽

K. Szymański ◽

G. Moskal

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

High Velocity ◽

Steel Substrate ◽

Technological Properties ◽

Coating Properties ◽

Properties Of Coatings ◽

Microstructure And Properties ◽

Basic Properties

Abstract In this paper, microstructure and some properties of various coatings based on WC-Co obtained by the High Velocity Air Fuel technique are discussed. Initially, two WC-Co 83-17 powders of standard and superfine size were examined as a feedstock for a coatings deposition on a steel substrate. A standard Amperit 526.074 powder and an Inframat superfine powder were applied. Then three different sub-micrometric powders, WC, Cr3C2 and TiC were applied to modify the microstructure of WC-Co (Amperit 526.074). The aim of the investigations was to compare the microstructure and basic properties of coatings deposited from different components. The influence of sub-micrometric additions on mechanical properties of basic coatings was analyzed. Microstructure characterization of powders by using SEM and characterization of their technological properties as well, are presented. For all manufactured coatings obtained by a High Velocity Air Fuel method, the microhardness, porosity, adhesion to a substrate, and fracture toughness were determined. An improvement in WC-Co coating properties, as a result of sub-micrometric carbides addition, was revealed.

Download Full-text