A chloromethylated styrene-divinylbenzene copolymer support system functionalized with 4-benzaldehyde and 2-benzaldehyde was prepared. The degree of functionalization with aldehyde groups is well suited for the subseq...A chloromethylated styrene-divinylbenzene copolymer support system functionalized with 4-benzaldehyde and 2-benzaldehyde was prepared. The degree of functionalization with aldehyde groups is well suited for the subsequent use of the products as Wittig reagents. The polymer bound aldehyde was reacted with Wittig reagents to give olefin groups grafted on styrene-divinylbenzene copolymers. The reactions were carded out in phase transfer catalysis conditions. A simple procedure for the calculation of the degree of functionalization and the statistical modeling of the structural repetitive unit of the copolymer are reported.展开更多
In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylben...In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylbenzene copolymer microbeads(LDPS),their actions are preliminarily investigated in this paper.Experimental results indicate that when both the gelatine and polyvinyl alcohol(PVA)are used dispersion agents,the better effect is achieved,DVB is helpful to the formation of the lower density fine particles,the proportionof the DVB/St should be between 1:1-1.5:1.Compared with toluene,gasoline is the more effective diluent for the above target.展开更多
以4-氯甲基苯乙烯(CMS)为单体,CuCl/2,2′-联吡啶(bpy)为催化体系,通过原子转移自由基聚合反应(ATRP)制得超支化聚4-氯甲基苯乙烯(h -PCMS);再采用黄原酸钾对 h -PCMS表面的功能端基进行修饰,制得端基带有大量双硫酯基团的大分子链转移...以4-氯甲基苯乙烯(CMS)为单体,CuCl/2,2′-联吡啶(bpy)为催化体系,通过原子转移自由基聚合反应(ATRP)制得超支化聚4-氯甲基苯乙烯(h -PCMS);再采用黄原酸钾对 h -PCMS表面的功能端基进行修饰,制得端基带有大量双硫酯基团的大分子链转移剂(h -PCMS macro-CTA);通过可逆加成-断裂链转移聚合(RAFT)方法,以 h -PCMS macro-CTA依次引发甲基丙烯酸甲酯(MMA)和甲基丙烯酸丁酯(BMA)聚合制备星型多臂聚合物 h -PCMS 2300 - g -PMMA 5500 - b -PBMA 33000 ,分子量分布为1.6,其结构和性能经1H NMR,IR,GPC和DSC表征。展开更多
以偶氮二异丁腈(AIBN)为引发剂,十二烷基三硫代碳酸酯(DDMAT)为小分子链转移剂,将对氯甲基苯乙烯(VBC)、苯乙烯(St)进行可逆加成断裂链转移自由基(RAFT)无规共聚,合成两种单体物质的量比分别为1∶3和3∶1的二元无规共聚物聚对氯甲基苯乙...以偶氮二异丁腈(AIBN)为引发剂,十二烷基三硫代碳酸酯(DDMAT)为小分子链转移剂,将对氯甲基苯乙烯(VBC)、苯乙烯(St)进行可逆加成断裂链转移自由基(RAFT)无规共聚,合成两种单体物质的量比分别为1∶3和3∶1的二元无规共聚物聚对氯甲基苯乙烯-co-聚苯乙烯(PVBC-co-PS)。随后以氯化亚铜(CuCl)/2,2′-联吡啶(bpy)(物质的量比=1∶2.5)为催化体系,采用ATRP法将甲基丙烯酸丁酯(BMA)接枝到PVBC-co-PS上,通过凝胶渗透色谱仪(GPC)、核磁共振波谱仪( 1 H NMR)、傅里叶红外光谱仪(FTIR)、差示扫描量热仪(DSC)对聚合物进行了表征。结果表明,采用RAFT与ATRP联用技术成功制备两种具有不同接枝率的刷型共聚物聚对氯甲基苯乙烯-co-聚苯乙烯-g-聚甲基丙烯酸丁酯(PVBC-co-PS-g-PBMA)。展开更多
<正> Seven polystyrene-type adsorbents (Ⅰ—Ⅶ) were synthesized by the modification of styrene-divinylbenzene copolymer respectively with hydroxymethyl, aminomethyl, methoxymethyl, phenoxymethyl, (4-hydroxy phe...<正> Seven polystyrene-type adsorbents (Ⅰ—Ⅶ) were synthesized by the modification of styrene-divinylbenzene copolymer respectively with hydroxymethyl, aminomethyl, methoxymethyl, phenoxymethyl, (4-hydroxy phenoxy)methyl, (4-acetylphenoxy)methyl, and acetyl groups. Their structures were characterized with chemical methods and physical techniques. The adsorption capacities of the adsorbents to stevioside and gypenosides were determined via batch test in which the HPLC method was used for the analysis of Saponin concentration of solution. The results showed that all the adsorbents could adsorb these saponins to a certain extent, but Ⅵ and Ⅶ had large capacities owing to their moderate polarities.展开更多
文摘A chloromethylated styrene-divinylbenzene copolymer support system functionalized with 4-benzaldehyde and 2-benzaldehyde was prepared. The degree of functionalization with aldehyde groups is well suited for the subsequent use of the products as Wittig reagents. The polymer bound aldehyde was reacted with Wittig reagents to give olefin groups grafted on styrene-divinylbenzene copolymers. The reactions were carded out in phase transfer catalysis conditions. A simple procedure for the calculation of the degree of functionalization and the statistical modeling of the structural repetitive unit of the copolymer are reported.
文摘In view of the importance of dispersion agent,the amount of the crosslinking monomer and the diluent in suspension polymerization for the production of particle size narrowly distributed low-density stryene divinylbenzene copolymer microbeads(LDPS),their actions are preliminarily investigated in this paper.Experimental results indicate that when both the gelatine and polyvinyl alcohol(PVA)are used dispersion agents,the better effect is achieved,DVB is helpful to the formation of the lower density fine particles,the proportionof the DVB/St should be between 1:1-1.5:1.Compared with toluene,gasoline is the more effective diluent for the above target.
文摘以4-氯甲基苯乙烯(CMS)为单体,CuCl/2,2′-联吡啶(bpy)为催化体系,通过原子转移自由基聚合反应(ATRP)制得超支化聚4-氯甲基苯乙烯(h -PCMS);再采用黄原酸钾对 h -PCMS表面的功能端基进行修饰,制得端基带有大量双硫酯基团的大分子链转移剂(h -PCMS macro-CTA);通过可逆加成-断裂链转移聚合(RAFT)方法,以 h -PCMS macro-CTA依次引发甲基丙烯酸甲酯(MMA)和甲基丙烯酸丁酯(BMA)聚合制备星型多臂聚合物 h -PCMS 2300 - g -PMMA 5500 - b -PBMA 33000 ,分子量分布为1.6,其结构和性能经1H NMR,IR,GPC和DSC表征。
文摘以偶氮二异丁腈(AIBN)为引发剂,十二烷基三硫代碳酸酯(DDMAT)为小分子链转移剂,将对氯甲基苯乙烯(VBC)、苯乙烯(St)进行可逆加成断裂链转移自由基(RAFT)无规共聚,合成两种单体物质的量比分别为1∶3和3∶1的二元无规共聚物聚对氯甲基苯乙烯-co-聚苯乙烯(PVBC-co-PS)。随后以氯化亚铜(CuCl)/2,2′-联吡啶(bpy)(物质的量比=1∶2.5)为催化体系,采用ATRP法将甲基丙烯酸丁酯(BMA)接枝到PVBC-co-PS上,通过凝胶渗透色谱仪(GPC)、核磁共振波谱仪( 1 H NMR)、傅里叶红外光谱仪(FTIR)、差示扫描量热仪(DSC)对聚合物进行了表征。结果表明,采用RAFT与ATRP联用技术成功制备两种具有不同接枝率的刷型共聚物聚对氯甲基苯乙烯-co-聚苯乙烯-g-聚甲基丙烯酸丁酯(PVBC-co-PS-g-PBMA)。
文摘<正> Seven polystyrene-type adsorbents (Ⅰ—Ⅶ) were synthesized by the modification of styrene-divinylbenzene copolymer respectively with hydroxymethyl, aminomethyl, methoxymethyl, phenoxymethyl, (4-hydroxy phenoxy)methyl, (4-acetylphenoxy)methyl, and acetyl groups. Their structures were characterized with chemical methods and physical techniques. The adsorption capacities of the adsorbents to stevioside and gypenosides were determined via batch test in which the HPLC method was used for the analysis of Saponin concentration of solution. The results showed that all the adsorbents could adsorb these saponins to a certain extent, but Ⅵ and Ⅶ had large capacities owing to their moderate polarities.
