Preparation and characterization of polyurethane/silica aerogel nanocomposite materials

Abstract

In this investigation, silica aerogel (SA)/Rigid Polyurethane (PUR) foam composites and silica aerogel/Polyurethane (PU) composites were prepared by dry mixing of granular and grinded silica aerogels with polyol part. They were then combined with diisocyanate part. Three different types of PUR foams and an elastomeric coating grade of PU were studied as well. Results show that thermal conductivity of foams did not decrease by adding silica aerogel. It even increased for some grades which is assumed to be due to the change in cell configuration of these foams. It was also found that sound insulation performance of these cellular composites did not improve significantly. Unlike foam composites, addition of silica aerogel into elastomeric PU improved its thermal and acoustic insulation properties. Because of the more promising properties of elastomeric PU composites, further examinations including measurements of compression strength and water contact angle of silica aerogel/PU composites were also taken. Final results showed a significant improvement in general properties of PU coatings by adding little amounts of silica aerogel (1-4 wt %). V C 2016Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44521.

Facile Synthesis of Flexible Methylsilsesquioxane Aerogels with Surface Modifications for Sound- Absorbance, Fast Dye Adsorption and Oil/Water Separation

“…Since aerogels were first investigated as low sound speed materials, more and more studies about sound the absorption of aerogels were reported, most of which were related to soft organic fiber-composite SiO 2 aerogels [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ], such as silica–cellulose hybrid aerogels, polyurethane/silica aerogels, polyethylene terephthalate fiber nonwovens/silica aerogels, unplastisized polyvinyl chloride/silica aerogels and so on. All of these aerogel composites possess high flexibility and porosity, which inspired us to test the sound absorption of the resultant MSQ aerogels with similar properties.…”

Poliüretanın ısı yalıtım özelliklerinin silika esaslı partiküllerle iyileştirilmesi

“…Gözenekli yapıda üretilen silika, ısı yalıtım uygulamalarında oldukça fazla dikkat çekmiştir. Bu tür maddelerin üretiminde sodyum silikat, tetraetoksi silan (TEOS), tetrametoksi silan metiltrimetoksisilan, 3 amino-propil trietoksi silan prekürsor olarak kullanılmaktadır [7]. Ancak silika aerojel üretimi sentezlenme süresi ve maliyeti yüksek olan bir süreçtir.…”

Mechanical, acoustic, and thermal performances of shear thickening fluid–filled rigid polyurethane foam composites: Effects of content of shear thickening fluid and particle size of silica

“…used a perforation process to provide rigid polyurethane (PU) foam plates with greater load absorption and better acoustic absorption at medium and high frequencies. Dourbash et al . proposed silica aerogel/rigid polyurethane foam composites and silica aerogel/polyurethane composites.…”

“…In order to attain acoustic absorption, Lin et al 3 used a perforation process to provide rigid polyurethane (PU) foam plates with greater load absorption and better acoustic absorption at medium and high frequencies. Dourbash et al 4 proposed silica aerogel/rigid polyurethane foam composites and silica aerogel/polyurethane composites. They found that adding silica aerogel to elastomeric PU led to improved acoustic insulation performance.…”