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利用内耗和DSC的方法研究了不同纳米粒子含量PET/SiO2纳米复合材料和纯PET弛豫性能的变化,并计算出次级弛豫峰的激活能和峰高以及主级弛豫的激活参数和峰高.结果发现内耗峰的峰高和主弛豫的激活参数以及次级弛豫的激活能随纳米SiO2的增加而减小.一方面内耗峰的峰高主要是PET的非晶区的分子链或基团运动产生,因此纳米粒子的高效成核效应,促进PET结晶成核,非晶区减小,导致内耗峰减小.另一方面由于纳米粒子与PET产生化学接枝以及氢键等作用,对链段的运动起到了一定的限制作用,导致主弛豫的激活参数和次级弛豫的激活能的增加.因此纳米SiO2颗粒与PET基体之间的化学和物理相互作用导致了PET链段的弛豫特性的变化.
The changes of relaxation properties of PET / SiO2 nanocomposites and pure PET with different nanoparticle content were studied by means of internal friction and DSC, and the activation energy and peak height of the secondary relaxation peak and the activation parameters of the primary relaxation were calculated The results showed that the peak height of the internal friction peak, the activation parameters of the main relaxation and the activation energy of the secondary relaxation decrease with the increase of the nano-SiO2.The peak height of the internal friction peak is mainly the amorphous region of PET Chain or group movement, so the efficient nucleation effect of nanoparticles to promote the nucleation of PET crystallization, amorphous area decreases, resulting in reduced internal friction peak.On the other hand due to the chemical grafting of nanoparticles with PET and hydrogen bonding Which can restrict the motion of the segment and lead to the activation parameters of the main relaxation and the activation energy of the secondary relaxation.Therefore, the chemical and physical interactions between the nano-SiO2 particles and the PET matrix lead to the formation of PET Changes in the relaxation characteristics of the segments.