Synthesis, characterization and thermal properties of novel PMDA-PAPD/silica hybrid network polymers

2006 ◽  
Vol 3 (1-2) ◽  
pp. 65-73 ◽  
Author(s):  
Fengxian Qiu ◽  
Yan Jiang ◽  
Yuming Zhou ◽  
Juzheng Liu
Keyword(s):  
Thermal Properties ◽  
Hybrid Network ◽  
Network Polymers ◽  
Silica Hybrid

PMMA–silica hybrid thin films with enhanced thermal properties prepared via a non-hydrolytic sol–gel process

2008 ◽  
Vol 109 (1) ◽  
pp. 143-147 ◽  
Author(s):  
Xiaomei Song ◽  
Xingxue Wang ◽  
Haitao Wang ◽  
Wei Zhong ◽  
Qiangguo Du
Keyword(s):  
Thin Films ◽  
Thermal Properties ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Hybrid Thin Films ◽  
Silica Hybrid

Preparation, thermal properties, and flame retardance of epoxy-silica hybrid resins

2003 ◽  
Vol 41 (15) ◽  
pp. 2354-2367 ◽  
Author(s):  
Ying-Ling Liu ◽  
Chuan-Shao Wu ◽  
Yie-Shun Chiu ◽  
Wen-Hsuan Ho
Keyword(s):  
Thermal Properties ◽  
Flame Retardance ◽  
Silica Hybrid

scholarly journals Preparation and characterization of polysaccharide - silica hybrid aerogels

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Gabrijela Horvat ◽  
Milica Pantić ◽  
Željko Knez ◽  
Zoran Novak
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Surface Area ◽  
Nitrogen Adsorption ◽  
Silica Aerogels ◽  
Drastic Increase ◽  
Organic Precursors ◽  
Hybrid Aerogels ◽  
Silica Hybrid

Abstract Hybrid aerogels based on polysaccharides - silica were prepared and characterized. Tetramethylorthosilicate (TMOS) was used as inorganic precursor and various polysaccharides (alginate, pectin, xanthan and guar) were used as organic precursors. TMOS was added to polysaccharide aqueous solutions, resulting in stable wet gels. There were no additional chemicals or cross-linkers in the process. Produced wet gels were dried under supercritical conditions with CO2 in order to preserve their structure. The nitrogen adsorption results were compared to pure polysaccharide aerogels, prepared in our previous research. It is shown, that the addition of silica to pectin, xanthan, alginate and guar significantly improved their structural properties, primarily seen in the drastic increase of the surface area. Guar-silica aerogels reached the highest surface area of 679 m2 g−1. The thermal properties, including thermal degradation and thermal conductivity were highly improved. Among the prepared hybrid aerogels, pectin-silica samples had the lowest thermal conductivity of 19 mWm−1 K−1.

Free volume, thermal and morphological properties of photo-crosslinked thiol-Ene/ nanodiamond hybrid network

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Aslı Beyler Cigil ◽  
Seyfullah Madakbaş ◽  
Cumali Tav ◽  
Uğur Yahşi ◽  
Memet Vezir Kahraman
Keyword(s):  
Thermal Properties ◽  
Free Volume ◽  
Volume Fraction ◽  
Polymer Networks ◽  
Attenuated Total Reflection ◽  
Hybrid Network ◽  
Morphological Properties ◽  
Content Type ◽  
Free Volume Fraction ◽  
The Impact

Purpose The purpose of this research paper is to investigate the changes in free volume by adding acrylate modified nanodiamond particles. In this study, a cross-linked thiol-ene (T) network was obtained under ultraviole light. The changes in free volume were analyzed when acrylate-modified nanodiamond (M-ND) particles were added to the nanocomposites obtained. Positron annihilation lifetime spectroscopy (PALS), a well-established method, was used for this analysis. In addition, the effect of nanocomposites containing different ratios of acrylate M-ND particles (1, 2, 3 and 5 Wt. %) on the surface and the thermal properties were also examined. Design/methodology/approach The impact of different quantities of acrylate M-ND on the free volume and surface morphological properties of thiol-ene polymer networks were studied by using scanning electron microscopy, differential scanning calorimetry, attenuated total reflection, Fourier transform infrared spectroscopy, PALS and thermogravimetric analysis measurements. Findings The thermal properties of T/M-ND were found to depend on the weight percentages of the M-ND content. For increasing weight percentages of M-ND added to thio-lene polymer networks, the glass transition temperature (Tg) increased from 103°C to 154°C. The ortho-positronium (o-Ps) lifetime (free volume) and free volume fraction characterization of T/M-ND nanocomposites were investigated using PALS. Increasing temperature caused both the o-Ps lifetime (free volume) to change with increasing saturation and to linearly increase the intensity; however, an increasing weight percentage of M-ND caused no change at all for the o-Ps lifetime (free volume) and the free volume fraction. Originality/value According to published literature, and to the best of the authors’ knowledge, this is the first time a study examining the free volume properties in a thiol-ene system has been carried out.

Formation of silica/epoxy hybrid network polymers

2003 ◽  
Vol 315 (1-2) ◽  
pp. 197-205 ◽  
Author(s):  
Steven R Davis ◽  
Adrian R Brough ◽  
Alan Atkinson
Keyword(s):  
Hybrid Network ◽  
Network Polymers

The thermal properties of some amine tetraphenylboron salts8-Quinolinol and its derivatives

1960 ◽  
Vol 23 ◽  
pp. 332-336 ◽  
Author(s):  
W WENDLANDT ◽  
J VANTASSEL ◽  
G ROBERTHORTON
Keyword(s):  
Thermal Properties
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