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以PET/纳米TiO2复合材料为对象,采用TMA、DMTA等手段,从分子运动的角度对该复合体系的松弛行为进行了研究。结果表明,纳米粒子在聚合物基体中与分子链通过物理或化学作用限制分子链的运动与松弛。体现在复合体系的温度-形变谱图中,随纳米TiO2含量的增加,玻璃化转变提前,橡胶平台降低,黏流温度升高。在温度黏弹谱中,与纯PET相比PET/纳米TiO2复合体系的α转变提前,储能模量增加,低温下损耗模量也有所增加。
Taking the PET / nano-TiO2 composite material as the object, the relaxation behavior of the composite system was studied from the perspective of molecular motion by means of TMA and DMTA. The results show that the nano-particles in the polymer matrix and the molecular chain by physical or chemical action of molecular chain movement and relaxation. Reflected in the composite system temperature-deformation spectra, with the increase of nano-TiO2 content, glass transition ahead of the rubber platform to reduce the viscosity flow temperature. In the temperature viscoelastic spectrum, the α transformation of PET / nano-TiO2 composite system is earlier than that of pure PET, the storage modulus increases and the loss modulus increases at low temperature.