ABSTRACT:We prepared novel poly(methyl methacrylate) (PMMA)/CaCO 3 nanocomposites by using reverse micelle as a template. The nanoparticles of CaCO 3 were prepared by the reverse microemulsion with functional monomer, methyl methacrylate (MMA) as oily phase, and the PMMA/CaCO 3 nanocomposite was obtained via polymerization of MMA monomer. The SEM image showed that the nanoparticles of CaCO 3 were dispersed in the polymer matrix. Dynamic mechanical analysis (DMTA) was performed to investigate the interaction between the nanoparticles and the polymer chains. In the low-temperature ripening process, two tan ␦ peaks were observed in the nanocomposite, corresponding to the glass transitions of the matrix and the interface layer. In the high-temperature ripening process, only one tan ␦ peak was observed, suggesting that the interface layer forms a continuous phase. The nanoparticles behave as a physical crosslinker in the interface layer. Modification of the surface of nanoparticles with polyacrylamide and poly(N,NЈ-methylenedisacrylamide) in the nanocomposite did not show an appreciable effect on the interaction of nanoparticles with the matrix. Upon removal of the aqueous phase around the nanoparticles, we obtained surfacecapped nanoparticles by using an improved reverse microemulsion technique. Another PMMA/CaCO 3 nanocomposite was also obtained with these modified nanoparticles. DMTA analysis of this nanocomposite demonstrated that the aqueous phase layer around the nanoparticles does not significantly affect the interaction between the nanoparticles and the polymer chains.

Sulfonated phthalic magnesium salt (SPMS) was used in the leather deliming process. The deliming properties of SPMS was determined with the indicators such as the change of pH, content of NH4-N, COD of deliming float, deliming speed, etc. The results show that SPMS has a mild deliming ability, excellent buffering and calcium removal performance; the total nitrogen content of deliming float is 3.4% of the conventional deliming process. Comprehensive performance of deliming is well and the delimed crust has a fine, smooth grain. It can be used as non-ammonium deliming agent in the clean leather manufacture, and it will benefits for the energy saving and emission reduction of leather industry.

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Two different dendritic 8-hydroxyquinoline ligands were synthesized through convergent approach, and the products were characterized by nuclear magnetic resonance (NMR) and infrared spectrometry (IR); the fluorescence properties of the dendritic 8-hydroxyquinoline ligands and the corresponding metallic complexes with Zn (II) were also studied by fluorescent spectrometry. The results show that the dendritic modifications of 8-hydroxyquinoline nucleus enhanced the intensity of luminescence, and the peripheral functional groups in the dendritic structure may affect the property of luminescence; the obvious red shift observed in the fluorescence profile of dendritic 8-hydroxyquinoline zinc provides it prospect of extensive application in the discipline of organic electroluminescent materials.

Terminal phenolic hydroxyl triazine dendrimer (HTHP) was prepared by putting cyanuryl chloride and 1,3,5-benzenetriol into acetone and then adding K2CO3 into the mixture as deacid reagent, which is called “One Step Process”. HTHP can be used in the leather tanning process as an additive. The result shows that adding HTHP into leather tanning process can improve the combination tanning property of leather collagen. When we add 10% (based on the mass of pickled skin) of HTHP, the shrinkage temperature of crust is 63.11°C and the mechanism of tanning is same as the vegetable tannin which has abundant of plant polyphenol. When the usage of HTHP is 10% and the aluminum salts is 2.5% (consider the mass of Al2O3), the shrinkage temperature of crust can reach to 82.2°C. It can be concluded that it shows synergism when there are both HTHP and aluminum salts in the process.