Topic
Polystyrene
About: Polystyrene is a research topic. Over the lifetime, 28444 publications have been published within this topic receiving 508696 citations. The topic is also known as: PS & Poly(styrene).
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TL;DR: The metathesis of dioxaborolanes is reported, which is rapid and thermally robust, and used to prepare vitrimers from polymers as different as poly(methyl methacrylate), polystyrene, and high-density polyethylene that, although permanently cross-linked, can be processed multiple times by means of extrusion or injection molding.
Abstract: Windmills, cars, and dental restoration demand polymer materials and composites that are easy to process, assemble, and recycle while exhibiting outstanding mechanical, thermal, and chemical resistance. Vitrimers, which are polymer networks able to shuffle chemical bonds through exchange reactions, could address these demands if they were prepared from existing plastics and processed with fast production rates and current equipment. We report the metathesis of dioxaborolanes, which is rapid and thermally robust, and use it to prepare vitrimers from polymers as different as poly(methyl methacrylate), polystyrene, and high-density polyethylene that, although permanently cross-linked, can be processed multiple times by means of extrusion or injection molding. They show superior chemical resistance and dimensional stability and can be efficiently assembled. The strategy is applicable to polymers with backbones made of carbon-carbon single bonds.
766 citations
TL;DR: Stereoregularite du polymere obtenu en presence d'un compose du titane et de un organoaluminique as discussed by the authors, in presence of un compose du Titane et d'Un organo aluminique.
Abstract: Stereoregularite du polymere obtenu en presence d'un compose du titane et d'un organoaluminique
748 citations
TL;DR: In this paper, a linear crystalline polymers of α-olefins are synthesized and the properties of polypropylene, poly-α-butylene, and polystyrene are discussed.
Abstract: Publisher Summary This chapter discusses crystalline high polymers of α-olefins. The linear crystalline polymers of α-olefins are synthesized and the chapter also discusses the properties of crystalline polypropylene, poly-α-butylene, and polystyrene. Depending on the structure of the catalyst, different amounts, ranging from 0 to 100%, of the polymerization products are crystallizable and can be separated easily from the much more soluble noncrystalline polymers by solvent extraction. The new crystalline poly hydrocarbons have higher melting point, higher density, and lower solubility in organic solvents than the corresponding amorphous polyhydrocarbons having intrinsic viscosity of the same order of magnitude. The infrared spectra of crystalline polypropylene, of melted samples of the same polymer and of the amorphous polypropylene, show between 2 and 7.5 μ, the high adsorption regions characteristic of hydrocarbons.
728 citations
709 citations
TL;DR: In this paper , the authors developed a robust and sensitive sampling and analytical method with double shot pyrolysis - gas chromatography/mass spectrometry and applied it to measure plastic particles ≥700 nm in human whole blood from 22 healthy volunteers.
701 citations