Acknowledgements: This work was supported by the National Natural Science Foundation of China (No. 29875018), the Natural Science Foundation of Gansu Province (No. 3ZS051-A25-050), Science and Technology Tackle Key Problem Item of (No. 2GS064-A52-036-08), Gansu Key Laboratory of Polymer Materials (No. ZD-04-14) and Environmental Protection Foundation of Gansu (No. GH2005-10).
Project supported by the National Natural Science Foundation of China (29875018);the Natural Science Foundation of Gansu Province (3ZS051-A25-050) ;the Doctorate Foundation of Northwestern Politechnical University (CX200309) and Gansu Key Laboratory of Polymer Materials
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