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Mianyang, China

Qiu Z.-C.,University of Sichuan | Zhang J.-J.,University of Sichuan | Zhou Y.,University of Sichuan | Zhou Y.,Mianyang Normal College | And 4 more authors.
Polymers for Advanced Technologies | Year: 2011

Poly(p-dioxanone) (PPDO)/vermiculite (VMT) nanocomposites with exfoliated structure were prepared successfully by in situ intercalative polymerization of p-dioxanone (PDO) in the presence of organo-modified vermiculite (OVMT) with the aid of ultrasonic action. The nano-structure of the nanocomposites was established using X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) observations. The investigation of crystallization behavior by differential scanning calorimetry (DSC) and polarized optical microscopy (POM) proved that exfoliated OVMT platelets acted as a template for spherulite growth. The thermal stability of nanocomposites was enhanced than that of pure PPDO. Dynamic mechanical analysis (DMA) indicated nanoscale OVMT platelets restricted the motion of PPDO segments, which benefitted the increase of storage and loss modulus. The tensile properties showed that nanocomposites were reinforced and toughened significantly by the addition of nanoscale OVMT platelets. © 2009 John Wiley & Sons, Ltd.

Yang J.,China West Normal University | Yang J.,Mianyang Normal College | Su Z.,Mianyang Normal College | Hu J.,Mianyang Normal College | And 3 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2010

In order to well understand the effect of soil enzyme activity on soil organic matters, the relationship between soil organic matters and soil enzyme activities of the Davidia Involucrate virgin forest on Mt. Baiyun in Mianzhu, Sichuan, China was studied through path analysis. The results showed that urease activity with the maximum of path coefficient and determinative coefficient was the main factor of five soil enzymes affecting soil organic matters. Catalase, acid phosphatase and protease possessing significant correlation with soil organic matters were mainly the indirect factors affecting through urease activity. So the soil urease activity of the D. involucrate virgin forest could characterize the content status of organic matters and be used as an important index of soil fertility.

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