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Fine-tuning of the dielectric properties of polysiloxanes by chemical modification

机译：通过化学改性微调聚硅氧烷的介电性能

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摘要

A series of novel polysiloxanes is presented, the glass transition temperatures and dielectric properties of which are systematically fine-tuned by utilizing thiol-ene post-polymerization reactions. The pendant vinyl groups of a high molecular weight polymethylvinylsiloxane P1 were exhaustively reacted with the thiol compounds 1-butanethiol (2) and 3-mercaptopropionitrile 3 both separately to give polymers P2 and P3, respectively, as well as in various ratios x, y so as to create materials P2(x)P3(y) with greatly differing contents of the polar nitrile group (y). All modifications proceeded quantitatively as was confirmed by H-1 NMR spectroscopy. Because of the presence of the polarizable thioether and nitrile groups, the resulting siloxane polymers exhibit permittivity ranging from epsilon' = 4.7 to 18.4 for P2 and P3, respectively. The epsilon' values of all polymers P2(x)P3(y) carrying more than one kind of thiolether group lie within this range. Additionally, broadband dielectric spectroscopy measurements of P2, P2(1)P3(1) and P3 have been conducted in the temperature range from -150 degrees C to 60 degrees C and the frequency range from 0.1 Hz to 1 MHz. Due to their high permittivity, polymers P2, P2(x)P3(y) and P3 are attractive candidates for dielectric elastomer actuators and flexible electronics.
机译：提出了一系列新颖的聚硅氧烷，其玻璃化转变温度和介电性能通过利用硫醇-烯后聚合反应进行系统地微调。高分子量聚甲基乙烯基硅氧烷P1的侧基乙烯基分别与硫醇化合物1-丁硫醇（2）和3-巯基丙腈3分别进行彻底反应，分别得到聚合物P2和P3，以及以不同的比例x，y从而产生极性腈基（y）含量差异很大的材料P2（x）P3（y）。如H-1 NMR光谱所证实的，所有修饰都定量进行。由于存在可极化的硫醚和腈基，所得的硅氧烷聚合物对P2和P3的介电常数分别为ε'4.7至18.4。带有一种以上硫代醚基团的所有聚合物P2（x）P3（y）的ε值都在该范围内。此外，P2，P2（1）P3（1）和P3的宽带介电谱测量已在-150摄氏度至60摄氏度的温度范围和0.1 Hz至1 MHz的频率范围内进行。由于它们的高介电常数，聚合物P2，P2（x）P3（y）和P3是介电弹性体致动器和柔性电子产品的有吸引力的候选材料。

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