Synthesis and metal binding behavior of hydroxamic acid resins from poly(ethyl acrylate) crosslinked with divinylbenzene and hydrophilic crosslinking agent

Porous poly(hydroxamic acid) chelating resin was prepared by the reaction with poly(ethyl acrylate) crosslinked with divinylbenzene and hydrophilic crosslinking agent, and hydroxylamine. The hydrophilic crosslinking agents and diluent used in this article were ethylene glycol dimethacrylate or butanediol dimethacrylate, and 2,2,4-trimethyl pentane, respectively. The characterization of this type chelating resin was carried out by IR spectroscopy, density measurement, and scanning electron microscopy. Various metal binding properties such as extraction, kinetics, and selectivity were investigated with atomic absorption spectrometer and inductively coupled plasma spectrometer. Poly(hydroxamic acid) resins crosslinked with mixed crosslinking agents showed better metal extraction properties and faster adsorption rate than those crosslinked with divinylbenzene alone. And alkali treatment enhances the binding rate for metal ions because of the formation of other chelating ligands or micropores. © 1995 John Wiley & Sons, Inc.     

以阳离子乳化剂进行丙烯酸丁酯－苯乙烯乳液共聚的动力学研究

采用十二烷基二甲基苄基氯化铵（１２２７）乳化剂，对丙烯酸丁酯（ＢＡ）－苯乙烯（Ｓｔ）进行乳液共聚，研究了影响聚合速度的各种因素，得出了聚合速率方程和表观活化能．     

La和Bi对乙炔与甲酸甲酯加氢酯化合成丙烯酸甲酯的镍基催化剂性能的影响(英文)

在２２０℃和５０－６０大气压条件下,利用固定床对ＮｉＯ／ＳｉＯ２、ＮｉＯ／Ａｌ２Ｏ３、ＮｉＯ－Ｌａ２Ｏ３／Ａｌ２Ｏ３和ＮｉＯ－Ｂｉ２Ｏ３／Ａｌ２Ｏ３催化剂上的乙炔与甲酸甲酯加氢酯化合成丙烯酸甲酯进行了研究。镍基催化剂对乙炔的加氢酯化合成丙烯酸甲酯具有很好的活性。用浸透法制备的Ｍｏ／ＳｉＯ２催化剂的活性和丙烯酸甲酯的选择性均比离子交换法差。ＮｉＯ／Ａｌ２Ｏ３催化剂用Ｌａ或Ｂｉ改性后,其催化活性大大提高。ＸＰＳ、ＸＲＤ和ＴＰＲ结果表明,当催化剂用Ｌａ或Ｂｉ改性后,ＮｉＯ的晶粒明显减小,催化剂表面的Ｎｉ／Ａｌ原子比增大,催化剂的第二个还原峰温大大降低。     

气相色谱法分离和测定环境空气中的丙烯酸乙酯和甲基丙烯酸甲酯

用活性炭吸附环境空气中的丙烯酸乙酯和甲基丙烯酸甲酯 ,经二硫化碳 (CS2 )解吸后用气相色谱法测定 .在填充 2 .5 %DNP + 2 .5 %Bentone 34/ChromosorbWHPDMCS的玻璃色谱柱 (长 2m内径 3mm)上 ,丙烯酸乙酯与甲基丙烯酸甲酯及干扰物之间能较好地分离 .方法的回收率 :丙烯酸乙酯为 86.4%～ 1 0 3.0 % ,甲基丙烯酸甲酯为 86.3 %～ 1 0 1 .2 % ,变异系数 :丙烯酸乙酯为 4.1 %～ 4.4% ,甲基丙烯酸甲酯为 4.4%～ 4.9% ,当采样体积为 2 0L ,解吸液体积为 2 .0 0mL ,进样 2 μL时 ,丙烯酸乙酯和甲基丙烯酸甲酯的最低检测浓度分别为 0 .0 2mg/m3和 0 .0 1mg/m3.     

Maleic diamide polymerizable surfactants. Applications in emulsion polymerization

A series of new polymerizable non-ionic and ionic surfactants (surfmers) with amides groups on both sides of the C=C double bonds have been prepared upon reaction of maleic isoimide carrying a long alkyl chain (or a benzyl group) with a hydrophilic amine derivative. Their critical micellar concentration (CMC) was measured with a surface tensiometer. They have been engaged in batch emulsion polymerization of styrene, and semi-batch seeded copolymerization of styrene and butyl acrylate, giving stable latexes during the polymerization process, and upon extraction with ethanol, showing a high rate of incorporation at the particle surface. However these surfmers do not confer good steric stabilization properties, which may be expected from the use of non-ionic surfactants. To cite this article: I. Klimenkovs et al., C. R. Chimie 6 (2003).     

Atom transfer radical polymerization of (meth)acrylates and their novel block copolymers with vinyl acetate

Homopolymerization of methyl acrylate (MA) and methyl methacrylate (MMA) by atom transfer radical polymerization (ATRP) were carried out at 90 °C using methyl-2-bromopropionate (MBP) as initiator, copper halide (CuX, X=Cl, Br) as catalyst, 2,2^′-bipyridine (bpy) or N,N,N^′,N^′,N^″-pentamethyldiethylenetriamine (PMDETA) as ligand in 1-butanol (less polar and containing OH) and acetonitrile (more polar) solvents. It was found that with CuCl/bpy catalyst ATRP of MA and MMA in 1-butanol proceeded faster than that in acetonitrile. The rate of ATRP of MA and MMA in acetonitrile and 1-butanol was comparable when CuCl/PMDETA used as catalyst system. The number-average molecular weights increased with conversion and polydispersities were low . The ATRP of MA and MMA with vinyl acetate telomer having trichloromethyl end group (PVAc-CCl₃) were also used to synthesize new block copolymers. The structures and molecular weight of synthesized PVAc-b-PMA and PVAc-b-PMMA were characterized by ¹H NMR, FTIR spectroscopy and gel permeation chromatography (GPC) and shown that the block copolymers were novel.     

疏水改性羟乙基纤维素的流变性能研究

对疏水改性羟乙基纤维素(HMHEC)溶液的流变性质进行了系统研究,探讨了不同的浓度、温度、盐浓 度、pH值和剪切速率对其溶液表观粘度的影响.结果表明HMHEC溶液临界缔合浓度为0.3 g/100 ml.当HMHEC的浓度低于临界缔合浓度时,HMHEC溶液增稠以分子内缔合为主,增稠幅度小;当高于临界缔合浓度后,便会形成以大分子间缔合为主的动态物理交联网络结构.HMHEC水溶液具有良好的耐温耐盐及抗剪切性能,而且pH稳定性良好.     

紫外光固化脂环族环氧丙烯酸酯涂料的制备及性能

通过丙烯酸（AA）与脂环族环氧树脂的开环反应合成了可紫外光（UV）固化的脂环族环氧丙烯酸酯树脂（CEA）。采用红外光谱（FT-IR）对树脂结构进行了表征,研究了反应温度、反应时间对产率的影响。用活性稀释剂与CEA制备了涂料预聚物,用转板黏度计测定了预聚物的黏度,采用差示扫描量热（DSC）仪、综合热分析仪和铅笔硬度计对树脂固化膜进行了分析。结果表明：当丙烯酸与环氧基团摩尔比为1.03,120°C下反应25.8 h时,反应转化率可达96.58%。CEA固化膜的玻璃化转变温度为64°C,初始分解温度为314°C,活性稀释剂的加入增强了固化膜的耐热性,固化膜铅笔硬度可达6H。     

高吸水性树脂的合成与应用

综述了高吸水性树脂的研究、发展状况。并指出了高吸水性树脂研究中存在的问题。     

功能基化聚丙烯酸甲酯固定化青霉素酰化酶

合成了一系列大孔丙烯酸甲酯－二乙烯苯交联共聚物,经酰肼化、叠氨后固定青霉素酰化酶,考察了反应条件对固定化酶的影响,当交联剂用量为３０％,至孔剂量为１３０％,混合致孔剂（正庚烷与乙酸乙酯）中正庚烷的质量分数为５５％时,所制的载体经活化后得到的固定化酶酶活较高,为９５ｕ／ｇ（湿）,用分批式反应器连续水解青霉素Ｇ钾盐,使用６３批次后仍保留酶活７９．４％。