In order to develop a new way for utilizing Polyacrylonitril (PAN) fiber wastes, a super-absorbent resin was prepared using the waste of PAN fibers at alkaline hydrolysis condition with Al3+ as cross-linker. The molecular structure of the super-absorbent resin was confirmed by FTIR. The thermal degradation of super-absorbent resin consisted of one main weight loss step. Factors that can influence absorbencies of the super-absorbent resin were investigated, such as the amount of cross-linker. The super-absorbent resin has the water absorbency of 131g/g in distilled water. The super-absorbent resin can be used as a new material to water retention from the soil in agriculture.
The single perovskite BiFeO3 nanoparticles were prepared by a sol-gel process. The BiFeO3 nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy, and Brunauer-Emmett-Teller (BET) method. It was found that the prepared BiFeO3 nanoparticles show the large specific surface area of 136 m2/g, and narrow band gap of 2.12 eV. Consequently, BiFeO3 nanoparticles show high visible-light photocatalytic activity for decomposition of methylene blue in comparison with the commercial Degussa P25. It is concluded that the large specific surface area and the narrow band gap contribute to the high visible-light photocatalytic activity through enhanced adsorption capability and visible-light absorption.
The blends of poly(trimethylene terephthalate) (PTT) with maleated styrene-butylene-co-ethylene-styrene copolymer (SEBS-g-MA) were prepared by melt blending. Their morphologies and crystallization behavior were investigated. Morphology observation shows the well-dispersed phase of SEBS-g-MA in PTT matrix and the partical size of SEBS-g-MA increased as the content of SEBS-g-MA increasing. Differential scanning colorimetry(DSC) experiments showed that the melting point of pure PTT and their blends was almost constant. Addition of 5-30wt% SEBS-g-MA in blends increased crystallization points of PTT phase and the crystallinity of the blends were higher than that of PTT.
Poly (3-hydroxybutyrate-co-3-hydroxyvalerate)/CaCO3 blends were prepared by solution blend method. The effect of CaCO3 on the thermal and crystalline morphology properties was studied by differential scanning calorimetry (DSC), thermogravimetry (TG) and polarizing optical microscopy (POM) analyses. DSC showed the CaCO3 affected the crystallization behavior of PHBV as heterogeneous nucleation agent. TG results indicated better processability of the blends with 3wt% CaCO3 than that of pure PHBV. Integrated Maltese crossed spherulitic morphologies were revealed for both pure PHBV and PHBV/CaCO3 blend. While small-sized PHBV spherulites were formed when CaCO3 added to PHBV.
A series of novel organoclay(OMMT)/super-absorbent resin composites were prepared using the waste of PAN fibers at alkaline hydrolysis condition with Al2(SO4)3 as cross-linker. The effects of OMMT content on the chemical structure and degradation of the super-absorbent resin were investigated. The swelling behavior was also evaluated. The swelling rates of super-absorbent resin went up with increasing OMMT loading to 3wt% and then decreased with further increasing OMMT loadings. OMMT-based super-absorbent resin might have potential applications in many areas, such as construction engineering and hygienic products.
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