聚硅氧烷改性苯乙烯—丙烯酸丁酯共聚乳液膜性能的研究

采用共混和共聚两种改性方法制备了不同聚硅氧烷含量的苯乙烯－丙烯酸丁酯（Ｓｔ－ＢＡ）共聚乳液，测定了改性Ｓｔ－ＢＡ乳液膜的表面性能，吸水率及力学性能，并用ＳＥＭ对膜断面的形态结构进行了观察。结果表明：与共混改性相比，共聚改性Ｓｔ－ＢＡ乳液膜具有互穿网络结构，从而明显抑了聚硅氧烷向膜表面的迁移以及两相间的相分离过程，提高了改性Ｓｔ－ＢＡ乳液膜的耐水性及耐污染性，共聚改性Ｓｔ－ＢＡ乳液膜中聚硅氧烷含量在     

四元共聚乳液的合成及性能研究

采用异相粒子成核阶段滴加单体乳液的改进种子乳液聚合方法合成了 PBMA／P（BMA－AA－AM）和 PBMA／P（BMA－AA－HMA）2种功能复合聚合物乳液。研究了乳化剂,功能单体对乳液的影响。结果表明：随着乳化剂SLS、OS－15含量的增大,乳液粒径减小,乳液稳定性有一极佳值存在;随着功能单体含量增大,乳液粒径增大。     

聚硅氧烷改性苯乙烯－丙烯酸丁酯共聚乳液膜性能的研究

采用共混和共聚两种改性方法制备了不同聚硅氧烷含量的苯乙烯一丙烯酸丁酯（ＳＴ－ＢＡ）共聚乳液，测定了改性ＳＴ－ＢＡ乳液膜的表面性能、吸水率及力学性能，并用ＳＥＭ对膜断面的形态结构进行了观察。结果表明：与共混改性相比，共聚改性ＳＴ－ＢＡ乳液膜具有互穿网络结构，从而明显抑制了聚硅氧烷向膜表面的迁移以及两相间的相分离过程，提高了改性ＳＴ－ＢＡ乳液膜的耐水性及耐污染性。共聚改性ＳＴ－ＢＡ乳液膜中聚硅氧烷含量在１０％～１５％，改性效果明显，而对力学性能无明显影响。     

苯乙烯—丙烯酸酯—醋酸乙烯酯三元共聚乳液的合成

通过控制加料方式将醋酸乙烯酯引入苯乙烯－丙烯酸脂共聚乳液中，降低了苯－丙乳液的成本，同时乳液的性能不发生变化。着重讨论了醋酸乙烯酯、丙烯酸、乳化剂的用量对乳液的影响。     

水解VAE/苯丙乳液共混体系研究

乙烯－醋酸乙类共聚物（ＶＡＥ）乳液碱催化水解与苯乙烯－丙烯酸丁酯共聚物（ＰＢＡ－Ｓｉ）乳液共混改性,考察共混体系稳定性及流变性能,以ＴＥＭ及ＤＳＣ表征共混乳胶膜的形态结构及共混相容性,研究ＶＡＥ乳液的不同水解程度及不同配比对共混乳胶膜力学性能的影响。     

高性能硅丙乳液的研制

采用活性有机硅单体－γ甲基丙烯酰氧基丙基三甲氧基硅烷（A－174）改性丙烯酸酯乳液，研制成高性能硅丙乳液。性能测试结果表明，该乳液膜具有优良的力学性能和耐水性。．比较了不同A－174用量改性丙烯酸酯乳液的性能，探讨了其合成工艺。用该硅丙乳液配制的外墙乳胶涂料，其各项性能指标达到国标一级品的要求。     

聚氨酯/聚丙烯酸酯复合乳液的研制进展

综述了近年来聚氨酯－丙烯酸酯（PUA）复合乳液研究的新进展，总结介绍了各类聚氨酯－聚丙烯酸酯复合乳液（PUA共混复合乳液、PUA复合核／壳乳液、互穿网络PUA复合乳液）的制备方法和性能特点。并对该领域进一步的发展作了展望。     

PU-PMMA共聚乳液的合成与性能

合成了PU－PMMA核－壳乳液，探讨了PMMA含量对乳液耐水性，力学性能等的影响。     

标准简介

标准简介ＧＢ／Ｔ９７５６－１９９５合成树脂乳液内墙涂料本国家标准系推荐性标准。它代替了ＧＢ９７５６－８８。本标准规定了合成树脂乳液内墙涂料的产品分等、技术要求、试验方法、检验规则及标志、包装、运输。贮存等要求。本标准适用于由合成树脂乳液为基料与颜料、...     

醋酸乙烯—丙烯酸—甲基丙烯酸甲酯三元共聚乳液的研究

通过正交试验和综合评分的方法，对影响ＶＡＣ－ＡＡ－ＭＭＡ三元共聚乳液的７个因子进行了系统研究，得出共聚乳液的优化配方。试验结果表明，加入少量ＡＡ和ＭＭＡ与ＶＡＣ进行乳液共聚对改善ＶＡＣ均聚乳液的耐水性和胶接强度效果明显，作薄木贴面用胶，制品达到并超过日本二类特种胶合板标准的要求。ＦＴＩＲ分析表明，共聚乳液在固化过程中发生交联反应。     

Spectrophotometric and potentiometric studies of chelates formed between some metals and some azo dyes

The chelation of phenylazo derivatives of α-and β-naphthols with Co(II), Ni(II) and Cu(II) compounds have been studied in solution spectrophotometrically, while chelation with Ti(IV), Zr(II)O, Th(IV) and U(II)O2 compounds has been studied potentiometrically. The proton-ligand stability constants, the formation constants and the coordination of the chelates have been determined.     

Effect of preextension on electrical conductivity and physicomechanical properties of butyl rubber (IIR) loaded with different types of carbon black

The effect of preextension on the variation of the electrical conductivity (σ) of butyl rubber (IIR) loaded with high abrasion furance (HAF) and fast extrusion furance (FEF) carbon black with carbon concentration have been investigated. The change in σ has been explained as a result of the interaction between carbon and rubber and the effect of the occluded rubber. The effect of preextension on the electrical resistivity (ρ) variation with strain has also been studied. The changes have been interpreted as being due to either breakdown or reagglomeration, depending on the concentration of carbon black.     

聚苯乙烯修饰α-磷酸锆的合成与表征

采用十八烷基二甲基叔胺(DMA)与对氯甲基苯乙烯(CMS)合成的季铵盐(DMA-CMS)与α-磷酸锆(α-ZrP)进行阳离子交换反应,合成了具有反应活性的有机修饰磷酸锆(ZrP-DMA-CMS)。再利用本体聚合法,使该有机化处理的磷酸锆与苯乙烯反应,合成了聚苯乙烯修饰的磷酸锆P(St-ZrP-DMA-CMS)。运用FT-IR、TGA、XRD对所制备的ZrP-DMA-CMS及P(St-ZrP-DMA-CMS)进行了分析。XRD分析表明,DMA-CMS修饰的磷酸锆层间距离由0.8nm扩大为4.0nm;聚苯乙烯修饰的磷酸锆,其层间距则由4.0nm进一步扩大到4.4nm。TGA分析表明,聚苯乙烯修饰的磷酸锆P(St-ZrP-DMA-CMS)热稳定性比α-ZrP提高了17%。     

Crystallization behavior and mechanical properties of poly(aryl ether ether ketone)/poly(ether imide) blends

Crystallinity and mechanical properties of blends with different amounts of semicrystalline poly(aryl/ ether ether ketone) (PEEK) and amorphous poly(ether imide) (PEI) polymers have been studied. The blends, prepared by melt mixing, have been investigated by differential scanning calorimeter (DSC) to analyze the miscibility between the components and the final crystalline content. Moreover, for the 20/80 PEEK/PEI blend, crystallization in dynamic and isothermal conditions has been carefully investigated in order to find proper conditions for maximum development of crystallinity. Mechanical tests (static and dynamic) have been performed to evaluate the properties of the as-molded and crystallized blends and to compare them with those of crystalline PEEK and amorphous PEI neat resins. Finally, a few SEM observations have been performed to compare the fractured surface of the blend with those of the pure constituents.     

Studies on Some New Ru(III) Complexes Using aryl-azo Pentane- 2,4-dione and 2,6-bis (2'-Benzimidazolyl) Pyridine as Ligands: Synthesis, Spectroscopic, Luminescent, Electrochemical and Biological Activities

Some ruthenium(III) complexes with aryl-azo 2,4-pentanedione as co-ligands (L(1)H - L(3)H(2)) have been synthesized and characterized spectroscopically IR, (1)H NMR, UV/Vis, ESR, conductimetric) along with elemental analysis and FAB-mass data. Their luminescent and redox properties have been studied. The antibacterial, anti-HIV and antitmnour activities have also been reported.     

Extraction chromatographic method of preconcentration and separation of lead (II) with high molecular mass liquid cation exchanger

A selective method has been developed for the extraction chromatographic separation of lead (II) with Versatic 911 (liquid cation exchanger) coated on silanised silica gel. Lead (II) has been extracted from 0.1 M acetate buffer at the range of pH 4.5-6.5. The effects of pH, flow-rate, stripping agents on extraction and elution have been investigated. Exchange capacity of the prepared exchanger at different temperatures with respect to lead (II) has been determined. The extraction equilibrium constant (K_ex) and different standard thermodynamic parameters have also been calculated by temperature variation method. The effect of pH on R_f values in ion exchange paper chromatography has been investigated. In order to investigate the sorption isotherm, two equilibrium models, the Freundlich and Langmuir isotherms, were analyzed. Lead (II) has been separated from synthetic binary and multi-component mixtures containing various metal ions associated with it in ores and alloy samples. The method effectively permits sequential separation of lead (II) from synthetic quaternary mixture containing its congeners Cu (II), Sn (II), Hg (II) and Cu (II), Cd (II), Bi (III) of the same analytical group. The method was found effective for removal and recovery of lead (II) from industrial waste and standard alloy samples following its preconcentration on the column. A plausible mechanism for the extraction of lead (II) has been suggested.     

Oil resistant thermoplastic elastomers of nitrile rubber and high density polyethylene blends

Different grades of oil resistant thermoplastic elastomers (TPE) based on blends of nitrile rubber (NBR) and high density polyethylene (HDPE) have been developed. Chemical treatment of HDPE to evolve compatibility with NBR and dynamic vulcanization with different curatives have been studied. Determination of physico‐mechanical and thermal properties and relative crystallinity of these blends have been carried out. Oil resistance characteristics of the blends have been evaluated in different commercially used oils and fuels for applications as a substitute for NBR/polyvinyl chloride (PVC) blends.     

Recent resist developments in Japan—a review

Several kinds of resist materials for microlithography have been developed in Japan. Poly(4-vinyl phenol) sensitized with 3,3′-diazidodiphenyl sulfone has been proved to be a high resolution negative deep UV resist with high sensitivity and good resistance to dry etching. The use of this resist enables a 1:1 projection printer to replicate fine patterns with 1 micrometer (μm) minimum feature size at the rate of 90 wafers per hour. Poly(methyl isopropenyl ketone) (PMIPK) has been investigated as a positive deep UV resist. Several resists composed of PMIPK with or without sensitizers are commercially available. Dry-developable photo- and deep UV resists comprising PMIPK and aromatic bisazides have been developed. Poly(glycidyl methacrylate) having the sensitivity of 0.4 micro Coulomb (μC)/per square centimeter (cm²) is now being routinely used as a negative electron beam resist in the fabrication of chromium masks. Recently, aromatic polymers such as chloromethylated polystyrene, iodinated polystyrene, chloromethylated poly(α-methylstyrene), poly(vinylnaphthalene) and its copolymers have been investigated as dry-etching resistant electron beam resists.     

联苯单元丙烯酸酯的合成及光固化研究

本文研究了含有液晶基元联苯的新型光活性单体的合成及结构表征。新型光活性单体与甲基丙烯酸β羟乙酯(HEMA)、光引发剂复配成光固化胶,研究了紫外光固化膜的硬度、冲击性能、柔韧性、耐溶剂性、耐水性及耐热性等性能与结构的关系。