Polyimide (PI)/silica (SiO2) nanohybrid composite waveguide films prepared from Pyromellitic dianhydride (PMDA), 2,2-Bis (3-amino-4-hydroxyphenyl) hexafluoropropane (6FHP), nonlinear optical (NLO) molecule, coupling agent APTES and hydrolysate of TEOS via sol-gel process and thermal imidization. The silicacontent in the hybrid waveguide films varied from 0 to 22.5/wt%. The PI hybrids prepared were characterized by IR, thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), etc. They exhibit fair good optical transparency. The SiO2 phase is well dispersed in the polymer matrix. DSC and TGA results show that these hybrid waveguide materials have excellent thermal stability.

neration studies were also carried out to select right regenerant and the reuse property of this adsorbent was determined. Experimental results showed that this adsorbent exhibited maximum adsorption capacity of 98.8% at pH of 5-7, contact time for 40min, and dose of 0.2g when used to treat 50ml of Fˉ-containing aqueous solution.

Some thermal stable fluorine-containing polymides with side-chain second-order nonlinear optical (NLO) chromophores have been developed, which were prepared by one primidized, hydroxyl polyimide, follwed by the covalent bonding of a chromphore onto the weight percent. Dteailed physical properties showed that the resulting polyimides have good solubility in common organic solvents, relative high glss transition temperatures. Polymer waveguide devices can be easily spin-coated, ensuring a long-term alignment stability at elevated temperatures. These devices exhibit large electro-optic coefficients, 25pm V-1 at 0.83μm, which reained>95% at 120℃ for more than 100h.

Hybrid nanocomposite films of silica (SiO2) in polyimide (PI) from 4,40-(hexafluoroisopropylidene) diphthalic arhydride (6FDA), 2,2-Bis (3-amino-4-hydroxyphenyl) hexafluoropropane (6FHP) and nonlinear optical (NLO) molecule have been successfully fabricated by an in situ sol-gel process. The silica content in the hybrid films was varied from 0 to 22.5wt%. These nanocomposite films exhibit fair good optical transparency. Fourier transform infrared (FTIR) spectroscopy results confirm the formation of SiO2 particles in PI matrix. Scanning electron microscope (SEM) images show that the SiO2 phase is well dispersed in the polymer matrix. Their glass transition behavior and thermal stability were investigated by differential scanning calorimeter (DSC) and thermal gravimetric analysis (TG).

用甲基丙烯酸甲酯在硝酸铈铵和偶氮二异丁腈的联合引发下对胶原进行接枝共聚改性，并用制得的胶原接枝共聚物颗粒与氧化铟纳米粒子复合制成涂层。研究了接枝反应温度及萃取剂对胶原接枝共聚物及其复合物涂层的红外发射率的影响，同时对复合物涂层红外发射率的降低机理进行了初步探讨。结果表明，在反应温度为50～55℃时，先后用丙酮和水作为萃取剂，可制得粒径为40～80nm的胶原接枝共聚物颗粒，该颗粒与氧化铟纳米粒子复合后，涂层的红外发射率（8～14Lm）较单一的胶原接枝共聚物和氧化铟纳米粒子的红外发射率明显降低，胶原接枝共聚物纳米颗粒和氧化铟纳米粒子之间显示出较强的复合协同效应。

The La3+-loaded adsorbent was prepared by the reaction between La3+ and ethanolamine-modified vegetable tannic extract, to treat Fˉ wree solved. When other conditions were not changed, pH, temperature, stirring time, and dose were changed respectively and the adsorbance was tested respectively. Theresults show that this adsorbent possesses high saturted adsorptive capacity (18.80mg·g-1) when pH is 5～6, T≤80℃, 0.2g dosage, and 180min agitating time, and the adsorbance reaches the highest (98.5). The adsorbent can be easily regenerated with 0.5mol·L-1 NaOH at pH 12.

Collgen-g-PMMA copolymer and indium oxide nanoparticles were prepared by grafting copolymerization of methyl methacrylate onto collagen and sol-gel process separately, and collagen-g-PMMA/indium oxide nanocomposite was prepared by ultrasonic wave irradiation. Simultaneously two collagen/indium oxide nanocomposites were prepared by liquid-liquid dispersion and ultrasonic wave irradiation respectively in the interest of infrared emissivity investigation (8-14Am). Three nanocomposites were characterized by SEM, TEM, IR spectroscopy, thermogravimetric analysis and infrared emissometer. SEM and TEM indicated that three nanocomposites were of different microstructures, and that collagen-g-PMMA copolymer and indium oxide nanoparticles self-assembled into homogeneously spherical aggregates of 600nm in diameter, which is owing to, we proposed, the high activity of amphiphilic collagen-g-PMMA copolymer nanoparticles. It was found that two nanocomposites showed significantly lower infrared emissivity value than their components, but the rest one did not. Decrease mechanism of infrared emissivity value of nanocomposite was discussed based on microstructure. It was assumed that the decrease in infrared emissivity value of collagen-g-PMMA/indium oxide nanocomposite was attributed to strong interfacial interactions between collagen-g-PMMA and indium oxide.

Interest in nonlinear optical (NLO) organic materials has grown tremendously in recent years, primarily because of the telecommunication industry's need for high-bandwidth optical switching and processing devices to serve information and data transmission.1 Recently, a large efforts in chemical research have been aimed at designing and synthesizing novel electrooptical research have been aimed at designing and synthesizing novel electrooptical chromophores with large optical nonlinearities transparency in the near IR.2 However, it is generally recognized that two other performance charcteristics must be achieved in order to ensure the widespread commercial utilization of eletrooptical waveguide modulator technology, Good thermal stability and low optical loss demands that a number of structure-function relationships be defined.3 In this connection, We wish to report bere here our prelimidary results on a prefluorinated polymide system which incorporates three new electrooptical chromophores. These chromophores, based on a nitro group connected with benzothiazole as the acceptor end of donor-π-bridge-acceptor chromophore and a hydroxyl functional amino group as the donor end, have specific chernical stability. With these materials, a novel series of nonlinear optical polyimides can be obtained for optical modulation in waveguide, due to their good solubility, large optical nonlinearity and specific chemical stability.

weight-average molecular weights (Mn, Mw) up to 28 500 and 78 600, respectively, and a large glass transition temperature of 260℃. Using in situ poling and temperature ramping technique, the optimal temperatures (Topt) for corona poling were obtained to get the largest second-order NLO response. The electro-optical coefficient (γ33) of a polyimide at the wavelength of 830nm was up to 22 pm/V after corona poling under its Topt, and the value remained well at elevated temperatures (retained>87% at 240℃ for more than 120h). The thermal stability of NLO polyimides was studied by the UV spectrometry after poling of the films.