SYNTHESIS OF MACROPOROUS COPOLYMER OF VCA AND DVB

The reactivity ratios of vinyl acetate(VAc) and divinyl benzene (DVB) were calculated from the Q and e values.The possibility of the copolymerization of these two monomers was predicted and the copolymerization was carried out by suspension polymerization technique in the presence of pore producing agent (toluene and gasoine).The relative ratio of acetoxy group and benzene ring in the copolymer were monitored by IR measurement during the polymerization.The variation of pore properties,such as spectific surface area,porosity and average pore diameter,with polymerization time were determined.The copolymers at various polymerization time were alcoholyzed and thus the variation of the hydroxyl group content with polymerization time was studied.     

SYNTHESIS AND STRUCTURE OF MACROPOROUS MA—TMPTA COPOLYMERS AND THEIR APPLICATION IN ADSORPTION OF FLAVONOIDE FROM GINKGO LEAVES EXTRACT

Spherical macroporous copolymers of methyl acrylate and trimethylopropane triacrylate with different surface and pore structure were synthesized via suspension polymerization.and their surface and pore structure were characterized by measurements of surface area,apparent density and skeleton density and calculation of average pore diameter,The results revealed that crosslinking degree and porogent determined the physical structure of these copolymers.Some of the copolymers were applied to adsorptive purification of ginkgo leaves extract to enhance the content of flavonoids,the results showed that most of the copolymers could by used to increase the flavonids content.     

大孔乙酸乙烯酯－异氰尿酸三烯丙酯共聚物珠体的合成与结构表征

以乙酸丁酯和２００＃汽油为混合致孔剂，采用悬浮聚合方法合成了大孔乙酸乙烯酯－异氰尿酸三烯丙酯共聚物珠体。对其孔结构、表面结构、溶胀性能和热稳定性进行了详细研究。     

SYNTHESIS OF SPHERICAL MACROPOROUS ADSORBENT BASED ON UREA—FORMALDEHYDE CONDENSED POLYMER

Spherical macroporous adsorbents with active sites capable of hydrogen bonding adsorption based on urea-formaldehyde condensed polymer were synthesized via reversed suspension polymerization.The properties of the obtained adsorbent were also investigated in detail.The results showed that the water permeability could be improved by adding hydroxyl-contatining organic compound moiety into the adsorbent.The specific surface area and average pore diameter of these adsorbents increaswed while the porosity first increased then decreased with the increase of the amount of the added hydroxyl-containing compound.     

三烯丙基异氰酸尿酯－二乙烯苯－醋酸乙烯大孔共聚物的合成及其醇解反应

根据文献查得的Ｑ、ｅ值，计算了三烯两基异氰酸尿酯－二乙烯苯－醋酸乙烯三元共聚体系的竞聚率，预测了它们进行共聚的可能性．以甲苯和汽油为致孔剂，采用悬浮聚合的方法合成了此三元大孔共聚物，并研究了致孔剂用量、交联度等对共聚物孔性能的影响。实验发现，此共聚体系在适当条件下，可以制得很高比表面积的大孔共聚体，比表面积可高达１２１４ｍ２／ｇ。对合成的共聚物又进行了醇解反应，得到了含羟基的共聚体。     

SYNTHESIS AND FLUORESCENCE STUDY OF St／DVB COPOLYMERS LABELLED WITH PYRENE GROUPS

Two kinds of St/DVB copolymer beeds containing(1-pyrenyl) formyl and (1-pyrenyl) methyl groups respectively have been synthesized by both functionalization and copolymerization.The fluorescence spectra of the swollen polymers synthesized are similar in shape to those of the corresponding model compounds,while the intensity ratio of excimer to monomer shows clear dependence on the contents of the pyrene groups.     

丙烯酸甲酯-氰尿酸三烯丙酯共聚物的合成及其孔结构的研究Ⅰ.

氰尿酸三烯丙酯(TAC)与丙烯酸甲酯(MA)在致孔剂如环己烷、正丁醚或甲苯-汽油(200~#)存在下,用悬浮聚合得到一系列大孔共聚物。对这些共聚物孔结构的研究表明,它们的平均孔径达10000—80000(?),同时研完了致孔剂的分子结构和用量对共聚物孔结构的影响,并初步讨论特大孔共聚物形成的机理。     

A THEORETICAL STUDY ON THE STRUCTURES AND ENERGIES OF DIMER AND TRIMER OF DELTIC ACID （2，3—DIHYDROXYCYCLOPROPENE—1—ONE）

<正> The structures of deltic acid,its diner, and its trimer have been studied by semiempirical chemical method AMI.The stabilization energies of dinerization and trinerization are 32 and 65 kJ/mol- aspectively. The length of hydrogen-bond R(O...H-0) in diner is 3.04A,while the sane bond is slightly longer in trimer(R=3.06A).     

TREATMENT AND RESOURCE REUSE OF 1，2，4—ACID PRODUCING EFFLUENT WITH MACROPOROUS POLYMERIC ADSORBENT

The treatment and resource reuse of 1,2,4-acid producing wastewater by self-mademacroporous adsorption resin ND,A-107 was studied in this paper. Optimum adsorption anddesorption process parameters were acquired by systematically study. The polymeric resin NDA-10 7indicated good adsorption & desorption of 1,2, 4-acid in the wastewater. The removal efficiency of1,2,4-acid, CODer is about 78%, 72% respectively. It is evident that this adsorption process is anefficient treatment method for 1,2,4-acid producing wastewater. At the same time, the accumulationand resource reuse of l,2, 4-acid can be realized in this process.     

SYNTHESIS AND CHARACTERIZATION OF POLY（STYRENE—ETHYLENE OXIDE）DIBLOCK COPOLYMERS

Well-defined diblock copolymers of styrene(St) and ethylene oxide(EO) have been prepared by sequential living anionic polymerization of the two comonomers in THF.Diphenyl methyl potassum has been used as initiator.The block copolymers were characterized in detail by methods of size exclusion chromatography(SEC),^1H-NMR,FT-IR,dynamic mechanical analysis(DMA) and WAXD.     

三烯丙基异氰尿酸酯-醋酸乙烯酯交联聚合物研究(Ⅲ)——致孔剂对共聚物结构的影响

醋酸乙烯酯与异氰尿酸三烯丙酯在不同致孔剂如正辛烷、正庚烷、十氢化萘或醋酸丁酯存在下,用悬浮聚合法得到一系列大孔共聚物,测定和比较了这些共聚物的孔结构。实验结果表明:致孔剂的分子结构和用量对共聚物孔结构有显著的影响,其平均孔径最大可达5000Å,并初步讨论了致孔机理。     

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.     

SYNTHESIS AND CHARACTERIZATION OF COPOLYMER OF 2,5-BIS[（4-METHOXYPHENYL）OXYCARBONYL]STYRENE AND STYRENE WITH HIGH MOLECULAR WEIGHT

The random copolymers of styrene and 2,5-bis[(4-methoxyphenyloxycarbonyl)styrene] (MPCS) with different copolymerization ratio were synthesized by conventional free radical polymerization. The copolymer having high molecular weight was experimentally elucidated using a combination of proton nuclear magnetic resonance spectroscopy and gel permeation chromatography. The liquid crystalline behavior of the copolymer was studied using differential scanning calorimetry, X-ray diffractometry and polarized optical microscopy. It was found that the liquid crystalline behavior was dependent on the content of styrene. Experimental results show that the copolymer could turn into a liquid crystalline phase at about 180℃ when the content of styrene was less than 20%. The mechanical properties of the copolymer were also studied. Preliminary results indicate that the tensile strength decreases while the tensile modulus increases as the content of MPCS is increased.