期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
大孔交联聚苯乙烯吸附树脂的合成及其对叶绿素铜的吸附性能 被引量:5
1
作者 范云鸽 刘永宁 +1 位作者 史作清 何炳林 《高等学校化学学报》 CSCD 北大核心 1994年第9期1412-1415,共4页
通过改变苯乙烯-二乙烯苯共聚物的交联度和使用不同结构的二乙烯苯,合成了树脂Ⅰ-Ⅵ,在工业二乙烯苯共聚体系中加入少量丙烯酸甲酯合成了树脂Ⅶ;交联聚苯乙烯经Friedel-Grafts酰化反应在其苯环上引入乙酰基制备了树... 通过改变苯乙烯-二乙烯苯共聚物的交联度和使用不同结构的二乙烯苯,合成了树脂Ⅰ-Ⅵ,在工业二乙烯苯共聚体系中加入少量丙烯酸甲酯合成了树脂Ⅶ;交联聚苯乙烯经Friedel-Grafts酰化反应在其苯环上引入乙酰基制备了树脂Ⅷ。用物理技术和化学方法表征了树脂的结构。树脂对叶绿素铜的吸附量不仅与其二乙烯苯含量有关,还与二乙烯基的位置(间-,对-)异构有关,树脂骨架极性的增加,不利于树脂对叶绿素铜的吸附。 展开更多
关键词 联聚苯乙烯 吸附树脂 叶绿素铜
下载PDF
FLUORESCENCE STUDIES ON MORPHOLOGICAL CHANGE OF ST/DVB CROSSLINKED GELS DURING CHLOROMETHYLATION
2
作者 ZHANG Jixiang LI Hexian +3 位作者 WANG Guochang WANG Lin WANG Ying HE Binglin 《Chinese Journal of Reactive Polymers》 2002年第2期185-191,共7页
The morphological change of St/DVB crosslinked gels during chloromethylation wasstudied by fluorescence spectroscopy using St/DVB crosslinked and hypercrosslinked gels as controlsamples. It has been found that with in... The morphological change of St/DVB crosslinked gels during chloromethylation wasstudied by fluorescence spectroscopy using St/DVB crosslinked and hypercrosslinked gels as controlsamples. It has been found that with increase of chlorine content, the excimer emission band (~325nm)approaches to vanish, while the intensity of multi-ring aggregate emission band (~420nm) quicklyreaches a maximum, and then decreases sharply accompanied by appearance ofa new broad bandcentred at ca 488nm which roughly coincides with the typical emission band of hypercrossllinkedSt/DVB gels. Mearwhile, the result of IR measurement suggests that methylene bridge between phenylrings forms and increases with chloromethylation process. These results are explained in terms ofaside reaction of post-crosslinking, which densifies the loosely crosslinked networks and undoes thedensely entangled microgel nuclei. As a result, the morphology of the crosslinked gels becom es morehomogeneous with chloromethylation. 展开更多
关键词 Crosslinked Polystyrene CHLOROMETHYLATION Fluorescence Spectroscopy Hypercrosslinked Gels
下载PDF
SYNTHESIS AND FLUORESCENCE STUDY OF St/DVB COPOLYMERS LABELLED WITH PYRENE GROUPS
3
作者 Wang Guochang Liang Yuanfong +4 位作者 Gao Huan Liang Lijun He Binglin Chen liusheng Du Jinhuan 《Chinese Journal of Reactive Polymers》 1995年第1期90-98,共9页
Two kinds of St/DVB copolymer beeds containing (1 - pyrenyl) formyl and(1 -pyrenyl) methyl groups respectively have been synthesized by both functionalization and copolymerization. The fluorescence spectra of the swo... Two kinds of St/DVB copolymer beeds containing (1 - pyrenyl) formyl and(1 -pyrenyl) methyl groups respectively have been synthesized by both functionalization and copolymerization. The fluorescence spectra of the swollen polymers synthesized are similar in shape to those of the corresponding model compounds, whilethe intensity ratio of excimer to monomer shows clear dependence on the contents ofthe pyrene groups. 展开更多
关键词 Crosslinked polymer PYRENE FLUORESCENCE EXCIMER
下载PDF
Design and Synthesis of 4,4'-Disubstituted-[2,2']-Bipyridines for Catalyzing CO/Styrene Copolymerization with Palladium(Ⅱ)
4
作者 郭锦棠 郁培云 +1 位作者 王海霞 赵海洋 《Transactions of Tianjin University》 EI CAS 2015年第5期406-411,共6页
A series of 4,4'-disubstituted-[2,2']-bipyridines, featuring electron withdrawing/donating functional groups such as amino, chloro, nitro, ethoxycarbonyl, carboxy, methyl, methoxy and hydroxymethyl, have been syn- t... A series of 4,4'-disubstituted-[2,2']-bipyridines, featuring electron withdrawing/donating functional groups such as amino, chloro, nitro, ethoxycarbonyl, carboxy, methyl, methoxy and hydroxymethyl, have been syn- thesized and employed in the copolymerization of carbon monoxide (CO) and styrene. The available bipyridine and its derivatives were coordinated with palladium ( II ) acetate for catalyzing the copolymerization of CO and styrene, and the concomitant polyketone was characterized by means of t3C NMR, FTIR, differential scanning calo- rimetry (DSC) and element analysis techniques concerning its structure and thermal performance. The effect of dif- ferent electron-donating and electron-withdrawing groups on catalyst performance and molecular weight of co- polymer was studied under certain experimental condition. It has been proved that the enhancement of electron donating and conjugative effects on bipyridine ligand will not only improve the catalytic activity of the composi- tion, but also increase the molecular weight of the as-prepared polyketone. The catalytic activity is the highest in hydroxymethyl substituted 2,2'-bipyridine ligand(l 356 gSTCO/(gPd · h)), when the molecular weight and polydispersity index of the polyketone are Mn = 8 502, Mw = 1 3440 and Mw/Mn = 1.581, respectively. 展开更多
关键词 BIPYRIDINE CO/styene copolymerization palladium (II) complex POLYKETONE
下载PDF
Preparation of Thermoplastic Elastomer from Polypropylene-SIR 10 Rubber Blends with Addition of Dicumil Peroxide as Initiator and Divinylbenzene as a Crosslinker
5
作者 Amir Hamzah Siregar Yugia Muis Destia Saera Daulay 《Journal of Chemistry and Chemical Engineering》 2012年第12期1099-1105,共7页
Preparation of thermoplastic elastomer of Polypropylene-SIR 10 rubber blends with addition of DCP (dicumil peroxide) as initiator and DVB (divinylbenzene) as a crosslinker has been done. Blends of Polypropylene-SI... Preparation of thermoplastic elastomer of Polypropylene-SIR 10 rubber blends with addition of DCP (dicumil peroxide) as initiator and DVB (divinylbenzene) as a crosslinker has been done. Blends of Polypropylene-SIR 10 rubber with variation of weight 60/40 (w/w), 50/50 (w/w) and 40/60 (w/w) with variation concentration of DCP and DVB 1 phr, 2 phr and 3 phr were mixed into internal mixer at temperature 180 ℃. Then, the blends were pressed at 185 ℃ and specimen were molded according to the ASTM D638. The characterization were carried out based on tensile strength testing, crosslink percentage, morphology surface analysis with SEM and fungtional group analysis with FTIR (Fourier Transform Infra Red). The result showed that the blends of Polypropilene-SIR 10 rubber 60/40 (w/w) with 2 phr DCP and 1 phr DVB posses a higher tensile strength with value 1.37 Kgf/mm2 and value of elongation at break 17.58%, and value of percentage crosslink 82.4%. The result of morphology test with SEM showed that the blend was well homogenous. Spectra analysis with FT-IR has shown physical interaction among components of the blends. 展开更多
关键词 Polypropylena SIR 10 rubber DCP DVB mechanical test.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部