耐盐性聚丙烯酸盐类高吸水树脂的制备

耐盐性聚丙烯酸盐类高吸水树脂的制备宋彦凤，崔占臣，陈欣芳（吉林大学材料科学系长春１３００２３）关键词丙烯酸钠，丙烯酰胺，丙烯酸羟乙酯，共聚物，吸水树脂，耐酸性高吸水树脂是一种应用比较广的功能性高分子材料［１～５］．它的吸水率可高达几百倍乃至几千倍。但...     

酚醛型吸附树脂对水体系中吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂在水体系中对吡啶和N，N-二甲基苯胺的静态和动态吸附行为．结果表明，在水中树脂对吡啶和N，N-二甲基苯胺的吸附主要以疏水吸附机理进行；吸附吡啶和N．N-二甲基苯胺的初始阶段，即达到38．3～48．9％平衡吸附时，吸附速率数据和半经验速率方程很吻合：酚醛型吸附树脂等温吸附吡啶和N，N-二甲基苯胺的平衡吸附数据符合Langmuir方程，相关系数在0．99以上，酚醛型吸附树脂吸附吡啶和N，N-二甲基苯胺属单分子层吸附：用80％的乙醇溶液作洗脱剂来洗脱吸附吡啶已达饱和的JDW-2树脂，效果是很理想的．在3．6个床体积内洗脱率达91．52％，4．8个床体积内洗脱率达到94．85％。表明酚醛型吸附树脂具有优良的洗脱性能．     

PAA/PVA SIPN高吸水性树脂的制备及性能研究

采用水溶液法合成了聚丙烯酸-聚乙烯醇(PAA-PVA)半互传网络型高吸水性树脂,其工艺条件的优化结果为:丙烯酸(AA)与PVA质量比为10∶0.5,AA中和度为80%,加入AA单体质量0.14%的引发剂和0.025%的交联剂,产物吸水率为530g/g,吸盐水率达63g/g。并采用红外光谱法表征了半互穿网络结构的形成。     

THE SYNTHESIS AND CHARACTERIZATION OF SOME POROUS CROSS—LINKED POLY （VINYLACETOPHENONE） RESINS AND THEIR CAPACITIES IN ADSORBING GYPENOSIDES

In search of a suitable adsorbent used for the enrichment and separation of natural saponins from an aqueous solution,a series of porous cross-linked poly (vinylaceto-phenone) resins I-Ⅸ were synthesized via the Friedel-Crafts acylation of styrene-divinyl-benzene copolymer beads.Their carbonyl contents were characterized by infrared spectra and elemental analysis.Their physical properties such as bulk densities,skeleton densities,and specific surface areas were also determined.The tests for the resins adsorption of gypenosides showed that only those resins with high carbonyl contents and large specific surface areas could favorably adsorb gypenosides from an aqueous solution with much higher capacities.     

炭化树脂负载杂多酸催化剂的制备和表征

炭化树脂负载杂多酸催化剂的制备和表征高峰孙经武（天津大学应用化学系，天津３０００７２）钟顺和（天津大学化学工程系，天津３０００７２）关键词炭化树脂，磷钨酸，负载型催化剂，烷基化反应分类号Ｏ６４３杂多酸作为一种新型的多功能催化剂正日益受到人们的关注［...     

AASI新型吸附树脂对芳香氨基酸的吸附、洗脱性能研究

用AASI新型吸附树脂来吸附苯丙氨酸、酪氨酸，研究了pH、温度，溶液中盐浓度对吸附性能的影响以及树脂结构与吸附性能间的关系，计算了树脂BET比表面的有效利用率。     

树脂对茶多酚与咖啡因的吸附分离

从低档绿茶末的水提取液中，利用离子交换，吸附树脂成功地分离出茶多酚与咖啡因，并详细考察了其交换与吸附性能。与其它方法相比，该树脂法具有产品收率高，成本低廉等特点。     

笼形聚偕胺肟树脂的研究──酸处理树脂吸附H_2PdCl_4

考查了无机酸、羧酸和酚类化合物处理的笼形聚偕胺肟树脂吸附酸性溶液中H_2PdCl_4的能力，其中H_3BO_3/ACAO、HSCH_2CO_2H/ACAO和p－NH_2C_6H_4H/ACAO树脂对H_2PdCl_4的吸附容量分别是2．023、2．368和2．083mmol/g-R或215、252和222mgPd／g－R。优于相同条件下的碱处理树脂（BCAO吸附容量为1．828mmol/g-R）。研究了吸附动力学，讨论了吸附机理。     

从头计算方法比较TiSi_2的C54相和C49相

采用平面波超软赝势描述多电子体系,利用密度泛函理论和广义梯度近似,计算出C54相和C49相TiSi2的晶格常数、体弹性模量、形成能、电子态密度(DOS)和Mulliken电荷布居等性质.通过比较这两种物质的性质,发现尽管两者形成能很相近,但C49相结构对称性差、体弹性模量小、熔点低,Ti原子d轨道的反键强、离子性弱.这些性质上的差异和C49相TiSi2在固相反应中优先形成有关.     

ELUTION OF TUNGSTEN BY SODIUM COMPOUNDS AND ACCELERATION EFFECTS OF COEXISTENT COUNTER IONS IN MIXED ELUANT

The elution of WO4^2- ions by NaOH、NaNO3、NaCl and NH4Cl on strong basic anion exchange resins in quaternary ammonium form I and the adsorption properties after elution were studied.In addition,the elution curve,the permeation curve and the exchange capacities of operation were presented.The eluate containing tungsten with high content and excessive eluant of low content were obtained by employing the process of eluting using mixed solution of NaCl and NaOH.It′s possible to obtain Na2WO4·2H2O with high purity by evaporating and crystallizing the eluate.The results of mixed elution showed that the diffusion coefficients of Cl^-、OH^- and WO4^2- ions in solution or exchange agent varied due to the coexistence of counter ions and then the exchange velocity of WO4^2-→Cl^- and WO4^2-→OH^- was accelerated.