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Synthesis of Poly(phthalazinone ether ketone) Containing Sodium Sulfonate Groups via Direct Polymerization 被引量:3
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作者 Shou Hai ZHANG Xi Gao JIAN +1 位作者 Guo Qing WANG wen xia li 《Chinese Chemical Letters》 SCIE CAS CSCD 2002年第10期926-928,共3页
1, 2-Diliydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one(DHPZ) was sulfonated in concentrated Sulfuric acid. Poly(phthalazinone ether ketone) containing pendant sodium sulfonate group was synthesized from sulfonated and ... 1, 2-Diliydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one(DHPZ) was sulfonated in concentrated Sulfuric acid. Poly(phthalazinone ether ketone) containing pendant sodium sulfonate group was synthesized from sulfonated and pure 1,2-dihydro-4-(4-hydroxyphenyl)(2H)phthalazin-1-one, and 4,4'-difluorodiphenylketone. The sulfonated monomer and sulfonated polymer were characterized with FT-IR and H-1-NMR. 展开更多
关键词 SULFONATION SYNTHESIS poly(phthalazinone ether ketone).
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The Hausdorff Dimension of Sets Related to the General Sierpinski Carpets 被引量:1
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作者 Yong Xin GUI wen xia li 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2010年第4期731-742,共12页
In this paper we study a class of subsets of the general Sierpinski carpets for which the allowed two digits in the expansions occur with proportional frequency. We calculate the Hausdorff and box dimensions of these ... In this paper we study a class of subsets of the general Sierpinski carpets for which the allowed two digits in the expansions occur with proportional frequency. We calculate the Hausdorff and box dimensions of these subsets and give necessary and sufficient conditions for the corresponding Hausdorff measure to be positive finite. 展开更多
关键词 general Sierpinski carpets Hausdorff dimension Hausdorff measure
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