《Table 2 TGA and DTG data of PET fibers》

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《Preparation and Properties of Poly(ethylene terephthalate )(PET) Coated by Chitosan( CS) Based on Sol-gel Method》

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aInitial decomposition temperature；bThe maximum decomposition temperature，corresponding to the temperature peak in the DTG curves

Thermal behaviors of pristine and modified PET fibers w ere investigated by thermogravimetric analysis（TGA）.Figure 7show s the TGA and differential thermal gravity（DTG）curves of pristine PET，hydrolyzed PET，SE-PET and CS-SE-PET fiber.It is easy to notice that all TGA and DGT curves manifest identical trend，indicating that SE and CS slightly affect thermal decomposition mechanism of PET matrix.From Fig.7（a），there is an obvious weight loss in the range of 400 550℃，which can be attributed to the decomposition of PET chains.It revealed that all the PETs have similar thermal stabilities.The related thermal characteristic parameters are shown in Table 2.It revealed that four samples display similar values of Tiand Tmax.This phenomenon could be explained that hydrolysis，SE and CS did not undermine the internal structure and crystallinity of PET matrix.