在丙烯酰胺聚合反应中聚苯乙烯磺酸效应的研究

<正> 在聚合体系中添加具有一定结构的高分子化合物作模板,并利用此模板高分子与单体分子间存在的某种相互作用使单体分子按一定的排列进行聚合,这是所谓“模板聚合”的最初尝试,近年来,模板聚合已成为一类新的聚合方法,利用模板大分子对其周围单体分子反应过程和生成物结构、分子量的影响,有些研究者已由此成功地实现了对新生成物分子量和空间构型的控制,从而为实现高分子设计开创了新的途径。     

STUDY ON THE EFFECT OF POLYSTYRENE SULFONIC ACID MACROMOLECULES ON THE POLYMERIZATION OF ACRYLAMIDE

The effect of polystyrene sulfonic acid (PSSA) macromolecules on the polymerization of acrylamide (AM) has been studied. It was found that the rates of polymerization of AM were greatly increased in the presence of PSSA in the polymerization system.The maximum value of the rate of polymerization of AM was obtained when the ratio of [—SO_3H]: [AM] reached 3:1. When the insoluble crosslinked PSSA was used instead of the soluble one, this effect decreased considerably. The interaction between molecules of PSSA and AM was determined by infrared spectroscopy, elementary analysis and X-ray photoelectron spectroscopy. The combination form, —SO_3-NH_3~ CO—, formed between sulfonic group and amide group was found to be existed since the infrared absorption band of —NH_2 shifted from 3400cm~(-1) to 3150 cm~(-1), the binding energy of electron N_(18) changed from 399.7 eV to 401.3 eV, and the atomic ratio of N to S of the products was similar to the ratio of reagents. Based on these experimental results, the mechanism of AM polymerization in the presence of PSSA is proposed. The initial step is the combination of AM with sulfonic group to form —CONH_3~ , then followed by polymerization on the PSSA macromolecule. The role of PSSA on the polymerization of AM is discussed.     

甲基丙烯酸三苯墓甲酯和甲基丙烯酸酯类的共聚物在溶液中的螺旋诱导和解旋作用

甲基丙烯酸三苯墓甲酯和甲基丙烯酸酯类的共聚物在溶液中的螺旋诱导和解旋作用陈传福，刘卫宏，陈永明，任长玉，习复（中国科学院化学研究所北京１０００８０）关键词甲基丙烯酸三苯基甲酯，甲基丙烯酸甲酯，光学活性，螺旋诱导，解旋在手性阴离子复合引发剂存在下，甲基...     

以Fréchet型树状分子为侧基的聚甲基硅氧烷的合成与表征

合成了一类新型的以Fréchet型聚芳醚树状分子为侧基的聚甲基硅氧烷高分子, 并对其进行了GPC, DSC, TGA, AFM, 荧光以及紫外可见光谱等方面的表征.     

螺旋链聚甲基丙烯酸三苯甲酯包敷硅胶分离旋光异构体

用螺旋链聚甲基丙烯酸三苯甲酯（ＰＴｒＭＡ）包敷硅胶高效液相色谱法分离了十五对ＰＴＨ衍生氨基酸和药物旋光异构体,十四对系首次在ＰＴｒＭＡ柱上进行分离,其中十三对旋光异构体获得了分离。     

STUDY ON METHANOLYSIS STABILITY OF OPTICALLY ACTIVE COPOLYMERS OF TRIPHENYLMETHYL METHACRYLATE AND METHYL METHACRYLATE

The methanolysis of poly(triphenylmethyl methacrylate) (PTrMA) and its copoly-mers P(TrMA-co-MMA), P(TrMA-b-MMA) has been studied in the presence of anhydrousmethanol at 40℃ by electroconductometric method. It has been found that the methanoly-sis stability can be obviously improved for the copolymer, especially, the radom copolymer,P(TrMA-co-MMA).     

POLYMERIZATION MECHANISM OF N-VINYLCARBAZOLE WITH CHIRALLY ORGANIC SALT AS CATALYST

The polymerization mechanism is described by the conductance changewith the time during the polymerization. The mechanism can be explained by the equi-librium feature (i.e. main ion-pairs) between the free ions and the ion-pairs dissociated bythe organic salt (-) Sp~/(*~+) (+) CSA~(*~-) (An asterisk represents the chirality) and the schemeof the polymerization process is described mainly by the charge transfer complexes havingchiral induction power.     

2008年全国高中学生化学竞赛暨冬令营开幕式致辞(节选)

全国高中学生化学竞赛是一项有益于激发广大高中学生学习化学的兴趣、培养学生分析思考和创造性解决问题能力的活动,同时也是探索化学教育改革,提倡素质教育,早期发现和培养优秀学生的途径和方法之一.     

光学活性高分子的手性固定相

光学活性高分子的手性固定相陈传福,任长玉,习复（中国科学院化学研究所北京１０００８０）１前言众所周知,自然界和合成的旋光物质往往是以对映体的形式存在。例如,具有手性结构的合成与半合成药物多数为外消旋体。一般而言,含有手性中心的药物异构体,在药动力学和...     

氧化还原引发体系的丙烯酰胺聚合动力学研究

<正> Suen等采用氯酸盐-亚硫酸盐氧化还原引发体系在不同的pH条件下进行丙烯酰胺溶液聚合,结果表明,起始聚合速度与([ClO_3][H_2SO_3])~(1/2)成正比,井本用K_2S_2O_8为引发剂研究了pH对丙烯酰胺聚合的影响,认为pH在3—8范围内,起始聚合速度几乎不受pH影响,当pH达到9以上时,则急剧下降,我们采用过硫酸盐-亚硫酸盐、过硫