Reactive Polymers最新文献_第2页

Benzylation of benzene, toluene and anisole with benzyl alcohol catalyzed by cation-exchange resins 阳离子交换树脂催化苯、甲苯和苯甲醚与苯甲醇的苄基化反应

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00019-F

Maria Sol Marques da Silva, Claudia Lucas da Costa, Miriam de Magdala Pinto, Elizabeth Roditi Lachter

{"title":"Benzylation of benzene, toluene and anisole with benzyl alcohol catalyzed by cation-exchange resins","authors":"Maria Sol Marques da Silva, Claudia Lucas da Costa, Miriam de Magdala Pinto, Elizabeth Roditi Lachter","doi":"10.1016/0923-1137(95)00019-F","DOIUrl":"10.1016/0923-1137(95)00019-F","url":null,"abstract":"<div>The catalytic activity of gel and macroreticular ion-exchange resins (Lewatit and Amberlyst-15) was evaluated for the reaction of benzene with benzyl alcohol and benzyl chloride at 80°C in the liquid phase. With benzyl chloride, the monobenzylation product, diphenylmethane, was obtained in low yield, both with the gel and the macroreticular resins. Better results were obtained with benzyl alcohol as benzylation agent and the most active resin was Amberlyst-15. The benzylation of toluene and anisole with benzyl alcohol, catalyzed by Amberlyst-15, was also evaluated, the conversion of benzyl alcohol being proportional to the concentration of acid sites in the resin. Monobenzylation to benzyl toluene or benzyl anisole is the main reaction and the selectivity was usually found to be higher than 80%, when a toluene/alcohol or anisole/alcohol molar ratio of 10 is used. Secondary reactions to dibenzyl toluenes, dibenzyl anisole and benzyl ether occur to a varying extent, depending on the substrate ratios. In all cases, predominance of ortho/para isomers was observed.</div>","PeriodicalId":20864,"journal":{"name":"Reactive Polymers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-1137(95)00019-F","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74317838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Polyhydroxamic acids: synthesis, ion exchange separation and atomic absorption spectrophotometric determination of divalent metal ions 多羟基肟酸:合成、离子交换分离和原子吸收分光光度法测定二价金属离子

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00022-B

Y.K. Agrawal, K.V. Rao

引用次数: 11

Thermally reversible polymeric sorbents for acid gases, IV. Affinity tuning for the selective dry sorption of NOx 酸性气体的热可逆聚合物吸附剂，IV.选择性干燥吸附NOx的亲和调节

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00024-D

Abderrahmane Diaf, Eric J. Beckman

引用次数: 22

Ion-exchanging properties and coordinating behaviour of poly[3,5-(1-propio-2,4-dihydroxy phenylene)butylene] 聚[3,5-(1-丙基-2,4-二羟基苯基)丁烯]离子交换性能及配位行为

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00003-2

J.R. Patel, D.H. Sutaria, M.N. Patel

引用次数: 13

Functionalization of silica gel and montmorillonite by silane coupling reagent, IV. Application as immobilized catalysts in dioxygen oxidation of organic compounds 硅烷偶联剂对硅胶和蒙脱土的功能化研究，四。固定化催化剂在有机化合物双氧氧化中的应用

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00020-J

Yasuhiko Kurusu

引用次数: 10

Introduction of pyridine moeities into sulfochlorinated polyethylene hollow fibers 氯化亚砜中空纤维中吡啶分子的引入

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00017-D

S. Belfer, S. Binman, E. Korngold

引用次数: 3

Polyethyleneimine gel-coat on silica. High uranium capacity and fast kinetics of gel-coated resin 聚乙烯亚胺凝胶涂层二氧化硅。高铀容量和快速动力学的凝胶包覆树脂

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00004-3

M. Chanda , G.L. Rempel

{"title":"Polyethyleneimine gel-coat on silica. High uranium capacity and fast kinetics of gel-coated resin","authors":"M. Chanda , G.L. Rempel","doi":"10.1016/0923-1137(95)00004-3","DOIUrl":"10.1016/0923-1137(95)00004-3","url":null,"abstract":"<div>A new process has been developed for gel-coating a weak-base resin polyethyleneimine (PEI) as a thin layer on high surface area silica using preloaded Cu(II) as the host ion on silica and glutaraldehyde as the cross-linking agent, followed by removal of the host ion by leaching with acid. The >NCH(OH) group introduced by the reaction with glutaraldehyde is found to enhance both U and Fe sorption, the effect, however, being relatively more pronounced on the latter. An <math><mtext>O</mtext><mtext>N</mtext></math> mole ratio ∼0.70 of the gel-coated PEI resin is found to be optimum for U sorption. In U sorption from dilute (0.1–0.4 mM) aqueous solutions of UO2SO4 at pH 4–5, the gel-coated resin exhibits several times higher capacity than a conventional bead-form resin Dowex-1X8. However, the capacity of the resin-coated silica sorbent, containing a large percentage of low-capacity silica, is only comparable to that of the bead-form Dowex resin at low solution concentrations. The gel-coated resin also exhibits a significantly faster rate of attainment of equilibrium sorption as compared to the bead-form Dowex resin, the sorption kinetics being diffusion-controlled with a high value of 8.4 × 10−6 cm2/s for the product of distribution coefficient and effective diffusivity. The stripping of the sorbed U from the gel-coated sorbent with 2 N H2SO4 is nearly instantaneous.</div>","PeriodicalId":20864,"journal":{"name":"Reactive Polymers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-1137(95)00004-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78565596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

Preparation of poly[ethylene-g-(vinylbenzyl chloride)] and functionalization with bis(phosphonic acid) derivatives 聚乙烯-g-(乙烯基氯化苄)的制备及双膦酸衍生物的功能化

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00002-Z

Mats J. Sundell, Kenneth B. Ekman, Bror L. Svarfvar, Jan H. Näsman

{"title":"Preparation of poly[ethylene-g-(vinylbenzyl chloride)] and functionalization with bis(phosphonic acid) derivatives","authors":"Mats J. Sundell, Kenneth B. Ekman, Bror L. Svarfvar, Jan H. Näsman","doi":"10.1016/0923-1137(95)00002-Z","DOIUrl":"10.1016/0923-1137(95)00002-Z","url":null,"abstract":"<div>Poly[ethylene-g-(vinylbenzyl chloride)] (1) film was prepared and used as an intermediate for the synthesis of polymer supported bis(phosphonic acid) derivatives. (1) was synthesized by preirradiation grafting of vinylbenzyl chloride (VBC) on polyethylene film. A reaction time of 29 h gave (1) with a chlorine capacity of 4.7 mmol Cl/g. As shown by energy dispersive X-ray analysis, the depth of the graft modification can be varied from surface to bulk modification by controlling the reaction time. The gel content of the film was found to increase with increased extent of grafting. A 28% VBC grafted film was found to have a gel content of 91%. The swelling of the Poly[ethylene-g-(vinylbenzyl chloride)] (1) film in toluene or THF was rapid A 145% VBC grafted film swells 260 area % within 2 min in refluxing toluene. Tetraisopropyl methylene-bisphosphonate (2) or tetraethyl ethane-1,1-bisphosphonate (3) were reacted with NaH and used for nucleophilic substitution of chlorine in the poly[ethylene-g-(vinylbenzyl chloride)] film. Forty-six percent of the chlorine groups were substituted within 24 h using the sodium salt of tetraisopropyl methylenebisphosphonate (2) in a 10-fold excess in refluxing toluene. Under the same reaction conditions, using the sodium salt of tetraethyl ethane-1,1-bisphosphonate (3) gave 50% substitution. Energy dispersive X-ray analysis showed that the substitution reaction proceeds throughout the film at the same rate, which implies that the reaction is not mass-transfer controlled. Hydrolysis of the polymer supported bisphosphonate in hydrochloric acid to yield the bis(phosphonic acid) form gave a film which swells 60 area % in water at room temperature and 100 area % at 100°C.</div>","PeriodicalId":20864,"journal":{"name":"Reactive Polymers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-1137(95)00002-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73542851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Molecularly imprinted composite polymers based on trimethylolpropane trimethacrylate (TRIM) particles for efficient enantiomeric separations 基于三甲基丙烷三甲基丙烯酸酯(TRIM)颗粒的分子印迹复合聚合物，用于有效的对映体分离

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00018-E

Magnus Glad , Per Reinholdsson , Klaus Mosbach

{"title":"Molecularly imprinted composite polymers based on trimethylolpropane trimethacrylate (TRIM) particles for efficient enantiomeric separations","authors":"Magnus Glad , Per Reinholdsson , Klaus Mosbach","doi":"10.1016/0923-1137(95)00018-E","DOIUrl":"10.1016/0923-1137(95)00018-E","url":null,"abstract":"<div>A convenient method to prepare spherical microparticulate composite adsorbents is described. Molecularly imprinted crosslinked methacrylate polymers were copolymerized with preformed microparticulate support particles of trimethylolpropane trimethacrylate (TRIM) containing residual double bonds. The resulting composite adsorbent could be packed in HPLC columns after just a simple washing procedure and was used for efficient chiral separation of amino acid derivatives. The pore system of the TRIM-particles could be filled with large amounts of functional polymer. The enantioselectivity for the print molecule Boc-L-Phe-OH was in the same range as that obtained by traditional bulk phase molecular imprinting, while the performance in HPLC was improved, both in terms of efficiency and pressure stability. The effect of various degrees of crosslinking and of monomer concentration on polymer characteristics, such as porosity and specific surface area, and its impact on the structure of the final polymer is discussed as well as the chromatographic performance of the resulting matrices.</div>","PeriodicalId":20864,"journal":{"name":"Reactive Polymers","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1995-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0923-1137(95)00018-E","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86981284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 72

Sorption of organic compounds from aqueous media by hypercrosslinked polystyrene sorbents ‘Styrosorbrs 超交联聚苯乙烯吸附剂对水介质中有机化合物的吸附

Reactive Polymers Pub Date : 1995-05-01 DOI: 10.1016/0923-1137(95)00021-A

M.P. Tsyurupa, L.A. Maslova, A.I. Andreeva, T.A. Mrachkovskaya, V.A. Davankov

引用次数: 98