PTC法合成对羧基苯甲酰二茂铁四乙酰葡萄糖酯

前文[1]报道了邻羧基苯甲酰二茂铁四乙酰葡萄糖基酯的合成及其抗贫血活性研究 ,发现邻羧基苯甲酰二茂铁及其四乙酰葡萄糖基酯具有较好的抗贫血性能,有望成为一类新型的补铁剂.     

光催化降解磷酸酯类农药的研究

以TiO₂/beads作为光催化剂,研究了磷酸酯类农药光催化降解的规律.结果表明,低浓度的磷酸酯类农药光催化降解符合一级动力学方程;4.0×10^-4mol/L的敌敌畏和久效磷农药,375W中压汞灯照射1.5h,其残留量小于10%,光照3.5h,有机磷被完全光催化降解至PO₄^3-.     

杂多配合物催化合成羧酸异戊酯的研究

杂多配合物催化合成羧酸异戊酯的研究王玉和，周百斌，关良智，王晓光，单永奎，李萍，周宏立（哈尔滨师范大学化学系哈尔滨１５００８０）关键词杂多酸，酯化作用，异戊酯，催化羧酸异戊酯广泛用于调制各种香型的食品香料，用作溶剂、萃取剂、制革、人造丝、涂料、化妆品...     

PREPARATION AND PROPERTIES OF FUMED SILICA/CYANATE ESTER NANOCOMPOSITES

Fumed silica/bisphenol A dicyanate ester（BADCy）nanocomposites were prepared by introducing different contents of nano-sized fumed SiO₂ into the BADCy matrix.Two different average primary particle diameters of 12 and 40 nm were chosen.Dibutyltindilaurate（DBTDL）catalyst was chosen to catalyze the cyanate ester group into triazine group via cyclotrimerization reaction.The SEM micrographs indicated that the fumed SiO₂ particles were homogeneously dispersed in the poly（bisphenol A dicyanate）matrix by means of ultrasonic treatment and the addition of a coupling agent. The FTIR spectroscopy shows that,not only DBTDL catalyzes the polymerization reaction but also-OH groups of the SiO₂ particles surface help the catalyst for the complete polymerization of BADCy monomer.The thermal stability of the cured BADCy can be improved by adequate addition of fumed SiO₂.A slight increase in the dielectric constant and dielectric loss values were identified by testing the dielectric properties of the prepared nanocomposite samples.By increasing the SiO₂ content,there was a slight increasing in the thermal conductivity values of the tested samples.The obtained results proved that the fumed silica/BADCy nanocomposites had good thermal and dielectrical properties and can be used in many applications such as in the thermal insulation field.     

超支化聚磷酸酯阻燃剂对尼龙6的成炭促进作用

以三氯氧磷和双酚A为原料制备了具有超支化结构的聚磷酸酯阻燃剂(HPPEA),通过红外(FTIR),核磁(1H-NMR,31P-NMR)及热重分析表征了产物的结构和热稳定性.将HPPEA与三聚氰胺聚磷酸盐(MPP)进行复配,通过熔融共混法制备阻燃尼龙6,通过氧指数法和垂直燃烧法测试了其阻燃性能,采用热重分析(TGA)研究...     

异辛基膦酸单异辛酯稀土配合物的快原子轰击质谱(FABMS)

酸性磷酸酯金属配合物组成和结构的测定有利于阐明萃取机理,是萃取化学中令人感兴趣的课题。标题配合物由于热稳定性差、挥发性小而且分子量大(结构筒式I,简称LnL_3),常规的质谱分析(EIMS、CIMS)难以进行。本文应用FABMS成功地对此配合物作了测定,并用亚稳跃迁技术对其裂解规律进行了探讨。     

吐温-80对固定化脂肪酶催化酮基布洛芬氯乙酯对映体选择性水解反应的影响

酮基布洛芬为2-芳基丙酸类非甾体抗炎药的一种,其药效与立体构型有很大关系[1].生物法催化的动力学拆分是获得单一对映体酮基布洛芬的有效方法之一[2,3].最近,我们发现在利用皱褶假丝酵母(Candida rugosa)脂肪酶Lipase OF催化拆分酮基布洛芬氯乙酯时,向反应体系中加入非离子表面活性剂吐温-80,不仅可大幅度提高反应速度,而且更重要的是解决了原来Lipase OF选择性较差的问题,从而为酮基布洛芬的对映体拆分提供了一种新方法.     

聚马来松香乙二醇酯Cu(Ⅱ)配合物固定化漆树漆酶的研究

制备了聚马来松香乙二醇酯(MEEP)Cu2 、Ni2 、Ca2 和Mg2 金属离子配合物,并分别以4种配合物为载体固定化漆树漆酶,初步探讨了反应时间对酶固定化的影响,考察了固定化酶的性质.实验结果表明,在反应温度为25℃条件下,漆树漆酶的最佳固定化时间为16h;MEEPCu2 配合物固定化酶的固定化结果较好,重复使用6次后,酶相对保留活力为55.0%;该固定化酶的最适作用温度为40℃,pH值范围为5.89～9.23,固定化漆树漆酶具有比游离酶更好的热稳定性和更广泛的pH值适用范围.     

APPLICATION OF THE SULFONATE ESTER GROUP AS A LINKER FOR SOLID PHASE ORGANIC SYNTHESIS

A use of sulfonate ester as a linker in synthesis of w-aminoalkanols was reporte.Diols were tethered onto polystyryl sulfonyl chloride resin,yielding sulfonate resins(2).After cleaved by diethyl amine,diisopropylamine and propylamine respectively,three w-aminoalkanlos were obtained.     

聚马来松香乙二醇酯Cu(II)配合物固定化漆树漆酶的研究

制备了聚马来松香乙二醇酯(MEEP)Cu2 、Ni2 、Ca2 和Mg2 金属离子配合物,并分别以4种配合物为载体固定化漆树漆酶,初步探讨了反应时间对酶固定化的影响,考察了固定化酶的性质。实验结果表明,在反应温度为25℃条件下,漆树漆酶的最佳固定化时间为16h;MEEPCu2 配合物固定化酶的固定化结果较好,重复使用6次后,酶相对保留活力为55.0%;该固定化酶的最适作用温度为40℃,pH值范围为5.89~9.23,固定化漆树漆酶具有比游离酶更好的热稳定性和更广泛的pH值适用范围。     

聚醚酯嵌段共聚物熔体的流变性能

采用毛细管流变仪测定了组成比、聚醚分子量、熔融时间和熔融温度对嵌段聚醚酯熔体表观粘度的影响．结果发现在所研究的温度和切变速率范围内,该结构聚醚酯熔体为假塑性非牛顿流体,其粘度随聚酯段含量的增加而增加,随熔融时间增加而降低,随聚醚分子量的增大而增大．聚醚酯的零切粘度可由Ｓｐｅｎｃｅｒ Ｄｉｌｌｏｎ 公式外推得到,零切粘度对温度的依赖关系服从Ａｎｄｒａｄｅ 公式．     

一种半晶性联苯酯侧基聚酰亚胺

聚酰亚胺作为一种高强度、高模量、耐热性材料正越来越广泛地得到应用．但是，因其刚性或半刚性的分子链，以及分子之间强烈的相互作用，使其熔融温度很高(很多高于其分解温度)，并且不溶解于大多数有机溶剂，这为成型加工带来困难．在聚酰亚胺大分子主链上引入侧链或侧基，     

KINETIC MODELING OF ESTERIFICATION OF EPOXY RESIN IN THE PRESENCE OF TRIPHENYLPHOSPHINE FOR PRODUCING VINYL ESTER RESIN: MECHANISTIC RATE EQUATION

Due to its mechanical properties and ease of use, vinyl ester resin is enjoying increasing consideration. This resin normally is produced by reaction between epoxy resin and unsaturated carboxylic acid. In the present study, bis-phenol A based epoxy resin and methacrylic acid was used to produce vinyl ester resin. The reaction was conducted under both stoichiometric and non-stoichiometric conditions in the presence of triphenylphosphine as catalyst. The stoichiometric and non-stoichiometric experiments were conducted at 95, 100, 105 and 110℃and at 90 and 95℃, respectively. The first order rate equation and mechanism based rate equation were examined. Parameters are evaluated by least square method. A comparison of mechanism based rate equation and experimental data show an excellent agreement. Finally, Arrhenius equation and activation energy were presented.     

APPLICATION OF THE SULFONATE ESTER GROUP AS A LINKER FOR SOLID PHASE ORGANIC SYNTHESIS

1. INTRODUCTIONIn recent years, solid phase organic synthesis (SPOS) has been increasingly used in the synthesis of small organic molecules [1]. The rapid development of SPOS brings with it the need for expanding a variety of linkers in order to accommodate new synthesis methods[2], and especially in the case of combinatorial chemistry, to allow additional diversity elements.Recently, Rueter and coworkers reported the use of a sulfonate ester as a linker in SPOS [3,4] and the compati…     

胆甾酯侧链聚硅氧烷液晶固定相的制备与色谱性能

将合成的胆甾酯侧链聚硅氧烷高分子液昌化合物涂渍在弹性石英毛细管内壁上，制备毛细管气相色谱固定相，该固定相具有较高的柱效，较好的热稳定性和分离选择性，对蒽，菲，芴及苊混合物和二氯苯异构体混合物具有良好的分离效果。     

Stereoselective synthesis of syn-β-amino esters using the TiCl4/R3N reagent system

The reactions of benzaldehyde imines and esters with the TiCl₄/R₃N reagent system give syn-β-amino esters as the major products in 38-87% yields.     

甲苯二异氰酸酯形成的聚氨酯脲与接枝乙烯基酯树脂互穿网络研究

本文首先通过分子设计技术合成了一系列侧链长度可以控制的接枝乙烯基酯树脂 (接枝VER :BO g VER ,2 0 0 g VER ,390 g VER) ,并用它们与甲苯二异氰酸酯合成的聚氨酯脲 (PUU)形成同步互穿网络(SIN) .通过DSC、SEM等考察了接枝VER的结构对PUU/接枝VERSIN的形态与力学性能的影响 .在PUU/BO g VERSIN中 ,BO g VER网络主要与PUU网络中的硬段相容和互穿 ;对于PUU/ 2 0 0 g VERSIN而言 ,2 0 0 g VER网络与PUU网络中的软段和硬段均有一定的相容性 .由于这两种SIN中两个网络间均有一定的相容性和互穿 ,故这类接枝网络能显著地增强PUU网络 ,使材料的力学性能有较大幅度的提高 .390 g VER网络本身存在的微相分离结构 ,使PUU/ 390 g VERSIN两个网络也存在显著的相分离形态 ,导致390 g VER网络对PUU网络的增强效果并不明显 .