Abstract BaTiO3/polymer composites, which combine the high dielectric constant of ceramics with the high dielectric strength of polymers, are used in modern microelectronics as capacitors, piezoelectric transducers and optoelectronic elements. The aim of the work was to determine the effect of barium titanate (BT) nanoparticles on physical properties of polyester resin (PR). The introduction of nanoparticles into a cross-linked polyester resin induces changes in its molecular structure and dynamics as a result of the particle-polymer interface. Molecular dynamics of polyester resin filled with barium titanate nanoparticles with BT content of 0.1% wt. and 1% wt. was studied. The internal motion of cured polyester resin and new PR/BT composites was investigated by different 1H NMR techniques. The temperature dependences of the spin-lattice relaxation times T1 in the laboratory frame and the frequency dispersions of the spin-lattice off-resonance relaxation times T 1 ρ off in the rotating frame were determined. Also, the first derivative of the absorption 1H NMR signal was recorded and the second moment of the signal was determined as a function of temperature. Differential Scanning Calorimetry was employed to study the thermal properties of the samples. The results showed that BT nanoparticles influenced the molecular dynamics and thermal properties of polyester resin. The addition of BT nanoparticles leads to a decrease in the correlation times and in the activation energy of internal motion in composites, compared with those for pure polyester resin. What is more, the glass transition temperature Tg and the thermal decomposition temperature TD of polymer composites shift to lower values.

中文翻译：

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用 1H NMR 技术研究钛酸钡纳米粒子掺杂聚酯树脂的分子动力学

摘要 BaTiO3/聚合物复合材料结合了陶瓷的高介电常数和聚合物的高介电强度，在现代微电子领域被用作电容器、压电换能器和光电元件。这项工作的目的是确定钛酸钡 (BT) 纳米粒子对聚酯树脂 (PR) 物理性能的影响。由于粒子-聚合物界面，将纳米粒子引入交联聚酯树脂会导致其分子结构和动力学发生变化。钛酸钡纳米颗粒填充聚酯树脂的分子动力学，BT 含量为 0.1% wt。和 1% 重量。被研究了。通过不同的 1H NMR 技术研究了固化聚酯树脂和新型 PR/BT 复合材料的内部运动。确定了实验室坐标系中自旋晶格弛豫时间 T1 的温度依赖性和旋转坐标系中自旋晶格偏共振弛豫时间 T 1 ρ off 的频率色散。此外，记录了吸收 1H NMR 信号的一阶导数，并确定了作为温度函数的信号的二阶矩。采用差示扫描量热法来研究样品的热性能。结果表明，BT纳米粒子影响了聚酯树脂的分子动力学和热性能。与纯聚酯树脂相比，添加 BT 纳米粒子导致复合材料中相关时间和内部运动活化能的降低。更，