COPOLYMERS OF 2-ACRYLAMIDO-2-METHYL-1-PROPANESULFONIC ACID/MALEIC ACID： SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY

2-Acrylamido-2-methy1-1-propanesulfonic acid(AMPS),and maleic acid(MA)copolymerized with different feed ratios using N,N-dimethylformamide as a solvent and benzoyl peroxide(Bz_2O_2)as an initiator at 70℃.Structure and composition of copolymers for a wide range of monomer feed were determined by elemental analysis(content of N for AMPS-units).Monomer reactivity ratios for AMPS(M_1)-MA(M_2)pair were determined by the application of conventional linearization methods such as Fineman-Ross(F-R),Kelen-Tüd(?)s(KT)and Extended Kelen-Tüds(EKT)and a nonlinear error invariable model method using a computer program RREVM.The characterizations were done by Fourier transform infrared spectroscopy(FTIR),differential scanning calorimetry(DSC)thermal gravimetry analysis(TGA),and and X-ray diffraction.The antimicrobial effects of polymers were also tested on various bacteria,and yeast.     

LOW DENSITY POLYETHYLENE/CLAY NANOCOMPOSITES MODIFIED BY ETHYLENE COPOLYMERS： EFFECTS OF FUNCTIONALIZED SEGMENTS ON MORPHOLOGY

Melt extrusion was used to prepare binary nanocomposites of ethylene copolymers and organoclay and trinary nanocomposites of low-density polyethylene （LDPE）, ethylene copolymer and organoclay. X-ray diffraction （XRD） and transmission electron microscopy （TEM） were used to analyze the structure of the clay phase and the morphology of the nanocomposites. Influences of the comonomer in the copolymer and the content of the copolymer on the morphology of the resulting nanocomposites were discussed. The binary and the trinary composites may form intercalated or exfoliated structures depending on the interaction between the copolymer and the clay layers and the content of the copolymer.     

聚合物载体-稀土金属配合物的研究IV.含亚硫酰基聚合物载体-稀土金属配合物的合成,表征及其催化活性

Styrene-2-(methylsulfinyl)ethyl methacrylate copolymer-supported MCl3 complexes, where M = La, Pr, Nd, Eu, Ho, Er, Tm, and Yb, were prepared and characterized by IR spectroscopy. The catalytic activity of the polymer-supported NdCl3-(iso-Bu)3Al system towards stereospecific polymerisation of butadiene was 2-3 times higher than that of NdCl3-(iso-Bu)3Al-DMSO system. The cis-1,4 content of polybutadiene formed was >98%.     

梳状高分子固体电解质的二级玻璃化转变及离子传输研究

研究了交替马来酸酐共聚物多缩乙二醇酯(CP350)-LiSCN配合物的热行为及离子传输特性。实验表明: CP350/LiSCN配合物在所研究[Li]/[EO]配比范围呈均相无定形并具有二级玻璃化转变。两种玻璃化转变温度均随盐含量的增加而上长。离子电导率随盐浓度的变化而出现一极大值, 室温电导率最大可达2.19×10^-^5s/cm。导电行为符合VTF方程。     

高分子负载苯并噻唑 盐的制备及其催化反应

制备了载于交联聚苯乙烯和苯乙烯与甲基丙烯酸羟乙酯的共聚物的苯并噻唑盐, 并研究了用这些高分子载体苯并噻唑盐催化的醛对α,β-不饱和化合物的Michael加成反应.     

γ辐照 聚全氟乙丙烯(F46)的电子自旋共振研究 I.真空中俘获自由基的定量研究

A method for determining respectively the concentration of free radicials...CF2-CF2.(RI), ...CF2-CF-CF2...(RII)and...CF2- C(CF3)-CF2...(RIII) trapped in γ-irradiated F46 in vacuum at room temperature by analysing the ESR overlapping spectra is proposed. A quantitative relation between the concentration of free readicals and the total dose of γ-irradiation has been studied. The generating rate o free radicals caused by irradiation, i.e. G-value, has been calculated; it is 2.0 for RIII, 1.2 for RI, and 0.59 for RII. the magnitude of G value of free radicals is in the reverse order of their stability. Hence, we assume that the G value of free radicals in F46 mainly depends on the escaping rate of F2 and other fluorine-containing small molecules from surface of polymer into space. Therefore the looser the molecular chain, the larger becomes the G value of free radical. From that, we consider that both unstable free radicals RIII and RI with larger G-value mainly locate in the amorphous region, and the stable free radical RII with lower G-value is in the crystalline region. Recombinations between free radicals RII and RIII, or between RII and RI are forbidden at the temperature lower than 80C. An explanation for the saturation phenomenon of concentration of free radicals is given.     

甲醇羰基化为乙酸的新型高聚物铑催化剂的合成, 结构与性能

以交联或非交联的丁烯酮2-乙烯吡啶共聚物为配体的新型铑配合物催化剂能在较温和的条件下直接催化甲醇羰基化为乙酸, 实验结果表明, 这类新型高聚物铑配合物具有螯合型顺-二羰基铑(I)的结构特征, 并且有良好的热稳定性及高的催化活性和选择性, 其周转率可达10^4摩尔甲醇转化(摩尔铑)^-^1(时)^-^1, 产物除乙酸甲酯和乙酸外, 无其它副产物, 选择性近100%。     

聚醚型非离子表面活性剂的混合表面膜 II: 环氧乙烷环氧丙烷共聚物与异辛基苯酚聚氧乙烯加成物和聚丙二醇的混合膜

本文进一步测定了环氧乙烷环氧丙烷共聚物与异辛基苯酚聚氧乙烯加成物和聚丙二醇等分子混合物在40%NaNO3水溶液表面所成膜的表面压(π)-分子面积(a)关系. 结果表明组成混合膜的两种组份可能形成了完全混溶的二维溶液.     

Surface segregational behaviour studied as an effect of thickness by SIMS and AFM in annealed PS-PMMA blend and block copolymer thin films

The surface behaviour of a two-phase polymer mixture depends on the chemical structure of the polymer components, the interaction between the two polymers and the processing conditions. The microscopic morphology and the surface composition need to be known in order to fully utilize the thin film properties. The technique of static time-of-flight secondary ion mass spectrometry (ToF-SIMS) is used to obtain the molecular surface composition of thin films of blends and block copolymers. The depth profiling tool of Nano-SIMS, a dynamic SIMS technique, helps to provide the chemical mapping of the surface in 2D and 3D. The surface morphology is investigated using AFM. Thin films of PS and PMMA diblock copolymers with molecular weight of 12K-12K and 10K-10K and blends of PS/PMMA (10K/10K) for thicknesses ranging from 5 nm to 50 nm are examined. For the blends, the ToF-SIMS spectra for all the thicknesses show the same behaviour of a high increase of PMMA on the surface after annealing. Nano-SIMS images reveal the formation of nanostructures on the annealed surfaces and AFM studies show these nanostructures to be droplets having distinct phase shift from the surrounding matrix. The droplet dimensions increase with the increase of the thickness of the film but the absolute intensity from the ToF-SIMS spectra for all the annealed films remains almost the same. For the copolymers, the ToF-SIMS spectra show that there is a decrease of PMMA on the surface for the annealed films when compared to the as-cast ones. AFM morphology reveals that, for different thicknesses, annealing induces different topographical features like droplets, holes, spinodal patterns, etc. but with no distinct phase shift between the patterns and the surrounding matrix. The two different copolymers of comparable molecular weight are found to exhibit very different topography even when the thickness of the films remained the same. The surface composition from the ToF-SIMS data, however, was not found to vary even when the topography was completely different.     

γ-辐照聚全氟乙丙烯的电子自旋共振研究 II: 真空中俘获自由基的自氧化过程

Autooxidation processes of free radicals trapped in γ irradiated F46 copolymer in vacuum at room temperature were studied by means of ESR. It is shown that these processes are under the dual control of both the diffusion of oxygen and the total concentration of free radicals, and they are independent of the autooxidation reaction rate constant. In general, the diffusion constant calculated by simple diffusion equation is an apparent diffusion constant, it is a function of the total concentration of free radicals. Only when the total concentration of free radicals is low enough (in our case n相似文献