Kossov Anton, Makrushin Vladimir, Levin Ivan, Matson Samira
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Prospect 29, 119991 Moscow, Russia.
Polymers (Basel). 2023 Jan 5;15(2):286. doi: 10.3390/polym15020286.
The thermally activated relaxation of poly(1-trimethylsilyl-1-propyne) (PTMSP) samples of various -/-compositions (50-80% units of -configuration) in the presence of phenolic antioxidants of various structures was investigated. It was pointed out that polymers with a high content of -units exhibited greater thermal-oxidative stability due to the greater flexibility of the -enriched macrochains. The use of hindered phenols as antioxidants made it possible to prevent the process of thermally initiated oxidative degradation. At the same time, the most effective stabilizing agents were antioxidants with larger molecules such as Vulkanox BKF, Irganox 1010, and Irganox 1076. It was shown that the permeability coefficients of stabilized PTMSP during thermal treatment initially slightly decreased (by 20-30%), which, according to the X-ray diffraction data, was associated with an increase in the density of the macrochain packing, and during further heating remained practically unchanged. Note that for the -enriched samples, no signs of oxidation or decrease in the transport characteristics were observed during polymer heating for 240 h at 140 °C.
研究了在各种结构的酚类抗氧化剂存在下，不同构型组成（50 - 80%的α-构型单元）的聚（1-三甲基硅基-1-丙炔）（PTMSP）样品的热活化弛豫。指出由于富含α-单元的大分子链具有更大的柔韧性，具有高含量α-单元的聚合物表现出更高的热氧化稳定性。使用受阻酚作为抗氧化剂能够防止热引发的氧化降解过程。同时，最有效的稳定剂是具有较大分子的抗氧化剂，如Vulkanox BKF、Irganox 1010和Irganox 1076。结果表明，稳定化的PTMSP在热处理过程中的渗透系数最初略有下降（下降20 - 30%），根据X射线衍射数据，这与大分子链堆积密度的增加有关，并且在进一步加热过程中基本保持不变。需要注意的是，对于富含α-单元的样品，在140℃下将聚合物加热240小时期间，未观察到氧化迹象或传输特性的下降。
