Oxidative Coupling Copolycondensation of 2,6-Dimethylphenol with 2,5-Dimethylphenol: Highly Thermostable Poly(phenylene ether)
نویسندگان
چکیده
منابع مشابه
Poly(N-4-vinylbenzyl-1,4,7-triazacyclononane) Copper Complex Grafted Solid Catalyst for Oxidative Polymerization of 2,6-Dimethylphenol.
A new solid phase catalyst, poly(N-4-vinylbenzyl-1,4,7-triazacyclononane) copper(I) complex, grafted onto polystyrene particles, has been employed for the oxidative polymerization of 2,6-dimethylphenol using an aqueous biphasic (water/toluene) solvent system. The solid catalyst was synthesized by first grafting N-(4-vinylbenzyl)-1,4,7-triaza-cyclononane onto polystyrene particles using a radica...
متن کاملCatalytic degradation of 3 , 5 - dimethylphenol with goethite and hydrogen peroxide
Phenolic compounds are one class of organic contaminants with high toxicity. In the present work, we study the degradation of 3,5-dimethylphenol (3,5-DMP) in heterogeneous phase with Fe(III)(hydr)oxides (goethite). The transformation of 3,5-DMP in aqueous suspension has been investigated under monochromatic irradiation at 365 nm. The disappearance of 3,5DMP was efficient upon irradiation of 3,5...
متن کاملSelective phenol methylation to 2,6-dimethylphenol in a fluidized bed of iron-chromium mixed oxide catalyst with o–cresol circulation
BACKGROUND 2,6-dimethylphenol (2,6-DMP) is a product of phenol methylation, especially important for the plastics industry. The process of phenol methylation in the gas phase is strongly exothermic. In order to ensure good temperature equalization in the catalyst bed, the process was carried out using a catalyst in the form of a fluidized bed - in particular, the commercial iron-chromium cataly...
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The present work is aimed at investigating the mechanical and in vitro biological properties of polyphenylene ether ether sulfone (PPEES)/nanohydroxyapatite (nHA) composite fibers. Electrospinning was used to prepare nanofiber composite mats of PPEES/nHA with different weight percentages of the inorganic filler, nHA. The fabricated composites were characterized using Fourier transform infrared ...
متن کاملSelective C-C coupling reaction of dimethylphenol to tetramethyldiphenoquinone using molecular oxygen catalyzed by Cu complexes immobilized in nanospaces of structurally-ordered materials.
Two high-performance Cu catalysts were successfully developed by immobilization of Cu ions in the nanospaces of poly(propylene imine) (PPI) dendrimer and magadiite for the selective C-C coupling of 2,6-dimethylphenol (DMP) to 3,3',5,5'-tetramethyldiphenoquinone (DPQ) with O2 as a green oxidant. The PPI dendrimer encapsulated Cu ions in the internal nanovoids to form adjacent Cu species, which e...
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ژورنال
عنوان ژورنال: Polymer Journal
سال: 2009
ISSN: 1349-0540,0032-3896
DOI: 10.1295/polymj.pj2009067r