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ABSTRACT: Anion exchange membranes with semi-interpenetrating polymer network (semi-IPN) were prepared based on quaternized chitosan (QCS) and polystyrene (PS). The PS was synthesized by polymerization of styrene monomers in the emulsion of the QCS in an acetic acid aqueous solution under nitrogen atmosphere at elevated temperatures. The semi-IPN system was formed by post-cross-linking of the QCS. A hydroxyl ionic conductivity of 2.80×10(-2) S cm(-1) at 80°C and a tensile stress at break of 20.0 MPa at room temperature were reached, respectively, by the semi-IPN membrane containing 21 wt.% of the PS. The durability of the semi-IPN membrane in alkaline solutions was tested by monitoring the variation of the conductivity and the mechanical strength. The degradation of the conductivity at 80°C was about 5% by immersing the membrane in a 1 mol L(-1) KOH solution at room temperature for 72 h and at 60°C for 50 h, respectively. The tensile stress at break at room temperature could maintain about 20.0 MPa for the membrane soaking in a 10 mol L(-1) KOH solution at ambient temperature for more than 70 h. The water swelling of the semi-IPN membranes was discussed based on the stress relaxation model of polymer chains, and it obeyed the Schott's second-order swelling kinetics.
Journal of Colloid and Interface Science 05/2011; 361(1):219-25. · 3.07 Impact Factor
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Advances in Swarm Intelligence - Second International Conference, ICSI 2011, Chongqing, China, June 12-15, 2011, Proceedings, Part II; 01/2011
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Advanced Intelligent Computing Theories and Applications. With Aspects of Artificial Intelligence, 6th International Conference on Intelligent Computing, ICIC 2010, Changsha, China, August 18-21, 2010. Proceedings; 01/2010
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ABSTRACT: In some cases, it is not necessary for anyone to be convinced a justification of signer’s signature. Motivated by the above
case, in this work we propose a provably secure convertible limited verifier signature scheme which based on the CDH assumption
and the difficulty of solving inverse of hash function, and a prominent property of the scheme is that only the limited verifier
can independently convert the limited verifier signature into the ordinary signature in the conversion phase, the original
signer cannot convert signature instead of the limited verifier. The limited verifier signature schemes available have not
this property. To the best of my knowledge, it seems to be first provably secure convertible limited verifier signature scheme
without using random oracle model.
10/2005: pages 638-644;
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Advances in Web-Age Information Management, 6th International Conference, WAIM 2005, Hangzhou, China, October 11-13, 2005, Proceedings; 01/2005
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ABSTRACT: Recently, Seung-Hyun et al proposed a nominative proxy signature scheme for mobile communication. However, we show that the scheme hasn't nonrepudiation, note that a malicious original signer can forge the proxy signer to sign on any message. Finally, we also present a modification of the scheme to repair the security flaw.
Advanced Information Networking and Applications, 2004. AINA 2004. 18th International Conference on; 04/2004
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Information Security and Cryptology - ICISC 2003, 6th International Conference, Seoul, Korea, November 27-28, 2003, Revised Papers; 01/2003
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IACR Cryptology ePrint Archive. 01/2002; 2002:177.
