A novel cross-linking process using two high molecular weight aromatic poly（thioether）s, which were synthesized by the reactions of 4,4＇-thiobisbenzenethiol with 4,4＇-difluorobenzophenone and 4,4＇-difluorodipheny...A novel cross-linking process using two high molecular weight aromatic poly（thioether）s, which were synthesized by the reactions of 4,4＇-thiobisbenzenethiol with 4,4＇-difluorobenzophenone and 4,4＇-difluorodiphenylsulfone, respectively, and commercially available lower molecular weight poly（p-phenylene sulfide） was investigated. These reactions were carried out in bulk by the addition of silver tetrafluroborate and α,α＇-dibromo-p-xylene at 190℃ over a period of 45 min. Furthermore, the same procedure could be modified to cross-link compression-molded films of these three polymers. The thermal and solubility behaviors of these polymers before and after cross-linking reactions, are presented.展开更多
Tetrabutylammonium fluoride （TBAF） effectively facilitated a denitrative substitution reaction of electron-deficient nitroarenes with phenylthiotrimethylsilane （PhSTMS） under mild and base-free neutral conditions ...Tetrabutylammonium fluoride （TBAF） effectively facilitated a denitrative substitution reaction of electron-deficient nitroarenes with phenylthiotrimethylsilane （PhSTMS） under mild and base-free neutral conditions at room temperature, providing a practical and efficient synthesis of useful unsymmetrical diaryl thioethers. Nitroarenes bearing ortho- and para-positioned electron-withdrawing groups are the most reactive substrates, indicating that this reaction most possibly proceeded via the nucleophilic aromatic substitution （SNAr） mechanism.展开更多
文摘A novel cross-linking process using two high molecular weight aromatic poly（thioether）s, which were synthesized by the reactions of 4,4＇-thiobisbenzenethiol with 4,4＇-difluorobenzophenone and 4,4＇-difluorodiphenylsulfone, respectively, and commercially available lower molecular weight poly（p-phenylene sulfide） was investigated. These reactions were carried out in bulk by the addition of silver tetrafluroborate and α,α＇-dibromo-p-xylene at 190℃ over a period of 45 min. Furthermore, the same procedure could be modified to cross-link compression-molded films of these three polymers. The thermal and solubility behaviors of these polymers before and after cross-linking reactions, are presented.
基金the National Natural Science Foundation of China(No.20902070)Natural Science Foundation of Zhejiang Province(No.Y4100579)Qianjiang Talents Program of Zhejiang Province(No.QJD0902004) for financial supports
文摘Tetrabutylammonium fluoride （TBAF） effectively facilitated a denitrative substitution reaction of electron-deficient nitroarenes with phenylthiotrimethylsilane （PhSTMS） under mild and base-free neutral conditions at room temperature, providing a practical and efficient synthesis of useful unsymmetrical diaryl thioethers. Nitroarenes bearing ortho- and para-positioned electron-withdrawing groups are the most reactive substrates, indicating that this reaction most possibly proceeded via the nucleophilic aromatic substitution （SNAr） mechanism.
