Relaxation behavior study on PET and PET/Ti3N4 nanocomposites Shenghong Kang, Guangtao Fei, Xingyou Tian, Kang Zheng, Xian Zhang and Jiapeng Shui Eur. Phys. J. Appl. Phys., 65 3 (2014) 30402 Published online: 24 March 2014 DOI: 10.1051/epjap/2014130466