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Effect of processing factors on dielectric properties of BaTiO3/hyperbranched polyester core-shell nanoparticles

机译：工艺因素对BaTiO3 /超支化聚酯核壳纳米粒子介电性能的影响

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In our recent publication we have demonstrated that BaTiO3/hyperbranched polyester/methacrylate hybrid nano-particles, with a filler fraction of 41 wt.% first dissolved in 2-butoxyethanol and crosslinked during 3 hours (at 125°C), exhibited highly promising dielectric constant as high as 85 at 1kHz. On the other hand, when the same hybrid nanoparticles have been diluted in methyl methacrylate (MMA) and then cured for 12 hours at the same temperature the permittivity of the material decreased significantly and reached 5 at 1 kHz. In the present work we have studied how processing factors, such as the employed diluent and crosslinking duration, affect the dielectric properties of the core-shell nanoparticles. In our first set of experiments we have studied the electrical properties of capacitors fabricated using the solution of hybrid nanoparticles diluted in 2-butoxyethanol. Curing has been monitored for 13 hours at 125°C. We have determined that the duration of thermal curing has a significant effect on dielectric properties of BaTiO3/hyperbranched polyester/methacrylate nanocomposites. In the second set of experiments the diluent influence on the properties of hybrid nanoparticles was investigated. As had been expected, dielectric constants of particles diluted in MMA were lower than those of hybrid particles diluted in 2-butoxyethanol. The origin of this phenomenon was determined by comparing the chemical behavior of the diluents under thermal curing. 2-butoxyethanol characterized by a boiling point of 170°C was evaporated during the thermal curing process. Despite the boiling point of 100°C, MMA polymerization is predominant upon evaporation, and leads to the decrease in the initial filler fraction. This explanation has been validated by measuring the weight losses of samples oven-dried at 125 °C for 13 hours. We discuss in detail the experimental data and results, as well as their use in understandin- the basic physical mechanisms underlying the observed electrical behaviors of hybrid nanoparticles.
机译：在我们最近的出版物中，我们证明了BaTiO 3 /超支化聚酯/甲基丙烯酸酯杂化纳米颗粒，其填料含量为41 wt。％，首先溶解在2-丁氧基乙醇中，并在3小时内（在125℃下）交联。 °C），表现出极有希望的介电常数，在1kHz时高达85。另一方面，当将相同的杂化纳米颗粒稀释在甲基丙烯酸甲酯（MMA）中，然后在相同温度下固化12小时时，材料的介电常数会明显降低，并在1 kHz时达到5。在目前的工作中，我们研究了加工因素，例如使用的稀释剂和交联时间如何影响核-壳纳米颗粒的介电性能。在我们的第一组实验中，我们研究了使用在2-丁氧基乙醇中稀释的混合纳米颗粒溶液制造的电容器的电性能。在125°C下监测固化13小时。我们已经确定，热固化的持续时间对BaTiO 3 /超支化聚酯/甲基丙烯酸酯纳米复合材料的介电性能有显着影响。在第二组实验中，研究了稀释剂对杂化纳米颗粒性能的影响。如所期望的，在MMA中稀释的颗粒的介电常数低于在2-丁氧基乙醇中稀释的杂化颗粒的介电常数。通过比较稀释剂在热固化下的化学行为来确定这种现象的根源。在热固化过程中蒸发了特征在于沸点为170℃的2-丁氧基乙醇。尽管沸点为100°C，但在蒸发后MMA聚合仍占主导地位，并导致初始填料分数降低。通过测量在125°C下烘干13小时的样品的重量损失，可以验证这一解释。我们详细讨论了实验数据和结果，以及它们在了解潜在的杂化纳米粒子电行为的基本物理机制中的用途。

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