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Li H.,Southwest Petroleum University | Zhu J.,University of Sichuan | Zhou Y.,Southwest Petroleum University | Zhou Y.,Sichuan Xinwei Rubber Co. | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

0.7BiFeO3-0.3PbTiO3 thin films with 0%, 1%, 5%, 10 % Mn doping (BFMPT7030/x, x=0, 0.01, 0.05, 0.1) were prepared on LaNiO3/SiO2/Si substrates by a sol-gel process. XRD results indicate that the films are completely crystallized and present highly (100) preferred orientation. Crystalline structure analyses of the thin films reveal that BFMPT7030/0.05 thin film has the smallest grain size (258 nm) and the smallest cell volume (61.25×10-3 nm3). SEM results show that the crystalline grains are fully grown up and the grain size is between 150~300 nm. The BFMPT7030 thin film with 5% Mn doping demonstrates good ferroelectric properties and a saturated hysteresis loop is observed. The leakage current tests show that with increasing of Mn content, the increasing tendency of the leakage current becomes slow as electric field increases. Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

Zhou M.,Southwest Petroleum University | Yang S.,Southwest Petroleum University | Yang S.,University of Sichuan | Zhou Y.,Sichuan Xinwei Rubber CO. | And 5 more authors.
Polymer (Korea) | Year: 2014

A novel poly(AM-DMDAAC)/MMT superabsorbent nanocomposites are prepared by radical polymerization using ammonium persulfate APS and anhydrous sodium sulfite as a free radical initiator and ¿VA-methylene bisacry-lamide (MBA) as a crosslinker. In this paper, an optimization study on the synthesis of superabsorbent nanocomposites is carried out. Orthogonal array experiment indicates that the optimized conditions is acrylamide (AM) content 23 wt%, diallyl dimethyl ammonium chloride (DMDAAAC) content 6 wt%, montmorillonite (MMT) content 4 wt%, initiator content 0.2 wt% and crosslinker content 0.02 wt%. Under the optimization syntheses conditions concluded, the maximum water absorbency in distilled water is 659.53 g-g-1 and in 2 wt% sodium chloride solution is 116.25 g-g-1. Compared with the range values of different factors (R), the order of significance factors in distilled water is C MMT > B (DMDAAC) > A (AM) > D (crosslinker) > E (initiator). MMT is intercalated during polymerization reaction and a nanocomposite structure is formed as shown by TEM analysis and XRD analysis.

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