Preparation of SiC whisker and application in reinforce of polystyrene resin composite materials

Abstract

A simple approach to fabricate silicon carbide (SiC) whisker is reported via using cellulose nanocrystal (CNC) as templates. The CNC with a length between 2 and 4 lm and a width about 40 nm is prepared by hydrolysis of microcrystalline cellulose (MCC) in strong sulfuric acid condition. The sol-gel reaction of tetraethyl orthosilicate (TEOS) is employed to coat the CNC in the presence of acetic acid as acid catalyst. The SiC whisker is obtained by calcination of CNC/SiO 2 hybrid at 1200 C.

α‐Thiophene end‐capped styrene copolymer containing fullerene pendant moieties: Synthesis, characterization, and gas sensing properties

“…9 There has been significant attention from both academic and industrial communities for CRP techniques due to its versatility in the synthesis of polymers with predictable molecular weights, low dispersities and specific functionalities, and its general applicability for a wide range of monomers. 10 Polymers can be functionalized at both side chain 11 and chain end 12 to improve their properties for different applications. Fullerene (C 60 ) is one of the most popular examples to be functionalized.…”

Reversible deactivation radical polymerization of polyfunctional monomers

“…As a result of RDRP in a thermodynamically good solvent [136] and in a thermodynamically poor solvent with an added polymer stabilizer (dispersion polymerization) [34,35,[137][138][139], the following polymer products can be prepared: monodisperse functional microbeads based on methyl methacrylate [140]; narrowly disperse, densely crosslinked, surface functionalized micro beads based on 4 vinylpyridine, glycidyl methacrylate, and 2 hydroxyethyl methacrylate [141]; thermosensi tive nanogels based on a macrodeactivator (poly(N,N' dimethylacrylamide with a trithiocarbon ate group at the chain end), 2 methoxyethyl acrylate, methoxy poly(ethylene glycol acrylate), and poly(eth ylene glycol diacrylate) [142]; biocompatible ther mosensitive nanogels based on methoxy(diethylene glycol methacrylate), methoxy poly(ethylene glycol methacrylate), and poly(ethylene glycol dimethacry late) [143]; microbeads with immobilized surface dithioester groups [144]; water compatible polymer microbeads [145]; Atrazine imprinted polymer microbeads (a capacity up to 2.89 mg/g) based on methacrylic acid and 4 vinylpyridine [146]; diben zothiophene imprinted (a capacity up to 2.89 mg/g) silica gel particles modified by methacrylic acid and 4 vinylpyridine copolymers [147]; Cefalexin imprinted (a capacity up to 59.4 mg/g) thermosensi tive polymer shell of yeast based on N isopropylacryl amide and ethylene glycol dimethacrylate [148]; 2,4 dichlorophenoxyacetic acid-and phenoxyacetic acid-imprinted polymer microbeads made from N isopropylacrylamide [149]; lysozyme imprinted thermosensitive spherical nanogels of N isopropyl acrylamide [150]; and polymer microbeads based on styrene, methyl methacrylate, and divinylsulfide [22,151].…”

“…This is the term that is most frequently used in the Russian liter ature [10][11][12][13][14][15][16][17][18][19][20][21][22], whereas outside Russia, apart from three dimensional polymerization, different terminol ogy is used-crosslinking polymerization [23][24][25][26][27], branching polymerization [28,29], network polymeriza tion [30], etc.-depending on the process conditions and the structures of the resulting polymers. In spite of the versatile conditions of performing three dimen sional radical polymerization that result in a wide vari ety of polymer materials strongly differing in proper ties (polymer networks, branched polymers, micro and nanogels) [13,[31][32][33][34][35], from the chemical point of view, the same process is used. The difference consists in the creation of special conditions leading to the absence or, in contrast, the occurrence of various physical phenomena (microsyneresis, precipitation, occlusion, etc.)…”

Surface Microstructure Regulation of Porous Polymer Microspheres by Volume Contraction of Phase Separation Process in Traditional Suspension Polymerization System

“…microspheres. [1][2][3][4] Many application fields require the microspheres with high surface area, including enzyme or catalyst immobilization, [5][6][7] physical adsorption, [8,9] detection, [10] and sensing. [11] The surface area of microspheres consists of two parts: the external surface area and the surface area of internal pore wall.…”