1. Qin R X, Liang Z Y, Li G Z, Chen H Y and Wen C L 2012 J. Anhui Agric. 40 14312
2. Zhang S N, Xie H, Huang L and Ma X S 2009 Therm. Resin 24 22
3. Wu L Y, Wang Y M, Meng Q X and Niu Z T 2010 Appl. Chem. Ind. 39 1564
4. Yoshikazu S, Itsuki T 2000 WO patent 068289
5. Kim W S, Jang H S, Hong K H and Seo K H 2001 Macromol. Rapid Commun. 22 825