Thermal and Mechanical Properties of Sol-Gel Silica Coated Fabrics

This paper investigated the influence of the nanoparticles on the thermal and mechanical properties of PA66 and various nanocomposites containing different weight fraction of polyoxometalate nanoparticles were prepared. The structural features of the nanocomposite are characterised using TEM, ATR-FITR, DMA and TGA. The results show that nanoparticles, around 5.5 nm in size are well-dispersed inside the polymer matrix. The physical interaction between PA66 and the POM nanoparticles led to a significant effect on the thermal and mechanical properties of PA66. Dynamic mechanical analysis (DMA) revealed a considerable change in the storage modulus of the nanocomposite. With only 1wt% of POM, the storage modulus of PA66 at 25oC is enhanced by 45%. Furthermore, the thermal stability of the nanocomposite is also enhanced, possibly owing to the absorption of oxygen by the nanoparticles. The results demonstrated that the obtained nanocomposites, via the combination of the excellent mechanical and thermal properties of PA66 with the intriguing optical, electrical and chemical properties of POM, were promising for catalytic, energy storage, memory devices, automobile and construction applications.

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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

Polymer Degradation and Stability ◽

10.1016/j.polymdegradstab.2007.11.006 ◽

2008 ◽

Vol 93 (1) ◽

pp. 1-8 ◽

Cited By ~ 19

Author(s):

A.K. Mishra ◽

A.S. Luyt

Keyword(s):

Mechanical Properties ◽

Wood Flour ◽

Sol Gel ◽

Organic Peroxide ◽

Low Density Polyethylene ◽

Low Density ◽

Thermal And Mechanical Properties ◽

Nano Silica

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Preparation, Characterization, and Enhanced Thermal and Mechanical Properties of Epoxy-Titania Composites

The Scientific World JOURNAL ◽

10.1155/2014/515739 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 19

Author(s):

Zakya Rubab ◽

Adeel Afzal ◽

Humaira M. Siddiqi ◽

Shaukat Saeed

Keyword(s):

Mechanical Properties ◽

Elevated Temperatures ◽

Sol Gel ◽

High Stress ◽

Thermal And Mechanical Properties ◽

Mechanical Mixing ◽

Scanning Calorimetry ◽

X Ray ◽

Thermal Oxidative Stability ◽

Epoxy Polymers

This paper presents the synthesis and thermal and mechanical properties of epoxy-titania composites. First, submicron titania particles are prepared via surfactant-free sol-gel method using TiCl4as precursor. These particles are subsequently used as inorganic fillers (or reinforcement) for thermally cured epoxy polymers. Epoxy-titania composites are prepared via mechanical mixing of titania particles with liquid epoxy resin and subsequently curing the mixture with an aliphatic diamine. The amount of titania particles integrated into epoxy matrix is varied between 2.5 and 10.0 wt.% to investigate the effect of sub-micron titania particles on thermal and mechanical properties of epoxy-titania composites. These composites are characterized by X-ray photoelectron (XPS) spectroscopy, scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric (TG), and mechanical analyses. It is found that sub-micron titania particles significantly enhance the glass transition temperature (>6.7%), thermal oxidative stability (>12.0%), tensile strength (>21.8%), and Young’s modulus (>16.8%) of epoxy polymers. Epoxy-titania composites with 5.0 wt.% sub-micron titania particles perform best at elevated temperatures as well as under high stress.

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Synthesis of Flexible Aerogel Composites Reinforced with Electrospun Nanofibers and Microparticles for Thermal Insulation

Journal of Nanomaterials ◽

10.1155/2013/375093 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 12

Author(s):

Huijun Wu ◽

Yantao Chen ◽

Qiliang Chen ◽

Yunfei Ding ◽

Xiaoqing Zhou ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Conductivity ◽

Thermal Insulation ◽

Polyvinylidene Fluoride ◽

Sol Gel ◽

Electrospun Nanofibers ◽

Ambient Atmosphere ◽

Thermal And Mechanical Properties ◽

Gel Processing ◽

Exchange Surface

Flexible silica aerogel composites in intact monolith of 12 cm were successfully fabricated by reinforcing SiO2aerogel with electrospun polyvinylidene fluoride (PVDF) webs via electrospinning and sol-gel processing. Three electrospun PVDF webs with different microstructures (e.g., nanofibers, microparticles, and combined nanofibers and microparticles) were fabricated by regulating electrospinning parameters. The as-electrospun PVDF webs with various microstructures were impregnated into the silica sol to synthesize the PVDF/SiO2composites followed by solvent exchange, surface modification, and drying at ambient atmosphere. The morphologies of the PVDF/SiO2aerogel composites were characterized and the thermal and mechanical properties were measured. The effects of electrospun PVDF on the thermal and mechanical properties of the aerogel composites were evaluated. The aerogel composites reinforced with electrospun PVDF nanofibers showed intact monolith, improved strength, and perfect flexibility and hydrophobicity. Moreover, the aerogel composites reinforced with the electrospun PVDF nanofibers had the lowest thermal conductivity (0.028 W·m−1·K−1). It indicates that the electrospun PVDF nanofibers could greatly improve the mechanical strength and flexibility of the SiO2aerogels while maintaining a lower thermal conductivity, which provides increasing potential for thermal insulation applications.

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