PET/PbS纳米复合材料的热降解动力学研究  

Kinetics of Thermal Degradation of PET/PbS Nanocomposites

作　　者：张洪伟[1] 俞昊[1] 汪宏斌[2] 李文刚[1] 季诚昌[1] 

机构地区：[1]东华大学纤维材料改性国家重点实验室材料科学与工程学院,上海201620 [2]上海大学材料科学与工程学院,上海200444

出　　处：《合成纤维》2010年第4期6-9,13,共5页Synthetic Fiber in China

基　　金：纺织面料技术教育部重点实验室开放课题的资助。

摘　　要：利用双螺杆挤出机挤出造粒制备了共混型PET/PbS纳米复合材料,并利用热失重(TG)方法研究了PET/PbS和纯PET在空气气氛下的热降解行为,发现PET/PbS和纯PET的热降解过程相似。利用Flynn-Wall-Ozawa法对数据进行处理,结果表明,在失重30%以前,PET/PbS-1(PbS质量分数1%)的降解活化能高于PET的活化能;当失重率在30%～70%时,PET/PbS-1的降解活化能小于PET的降解活化能。在降解前期,由于纳米PbS对PET分子链的某种限制作用,使得复合材料的活化能略高于纯PET;但在后期,PbS催化降解作用占据主导作用,使得复合材料的活化能低于纯PET,稳定性下降。The PET/PbS nanocomposites were prepared by twin-screw extruder, and the thermal degradation kinetics behaviors of PET and PET/PbS in air atmosphere by means of TG were studied. It was found that there was not much difference in the thermal degradation between PET and PET/PbS. The activation energy was determined using Flynn-Wall-Ozawa method. The results showed that the activation energy of PET/PbS was higher than that of PET before 30 % mass loss, and the former was less than the latter between 30 % and 70 % mass loss. It was concluded that in the beginning of degradation, due to the oxidation reaction of PbS and the restriction to PET chains, the activation energy of nanocomposites was higher than PET. The activation energy of nanocomposites was lower than that of PET due to catalytic degradation of PbS at the end of degradation.

关 键 词：聚对苯二甲酸乙二醇酯 纳米硫化铅 热降解 活化能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]