Anokhina Tatiana S, Ershova Tatyana O, Anisimov Anton A, Temnikov Maxim N, Grushevenko Evgenia A, Borisov Ilya L, Volkov Alexey V, Muzafarov Aziz M
V. Topchiev Institute of Petrochemical Synthesis RAS, 119991 Moscow, Russia.
N. Nesmeyanov Institute of Organoelement Compounds RAS, 119334 Moscow, Russia.
Polymers (Basel). 2023 Aug 2;15(15):3277. doi: 10.3390/polym15153277.
This paper presents the results of studies on the pervaporation properties (for benzene/hexane mixtures) and gas permeability (for He, H, N, O, CO, CH, CH, and CH) of ladder-like polyphenylsesquioxanes (L-PPSQ) with improved physical and chemical properties. These polymers were obtained by condensation of -tetraphenylcyclotetrasiloxanetetraol in ammonia medium. The structure of L-PPSQ was fully confirmed by a combination of physicochemical analysis methods: H, Si NMR, IR spectroscopy, HPLC, powder XRD, and viscometry in solution. For the first time, a high molecular weight of the polymer (Mn = 238 kDa, Mw = 540 kDa) was achieved, which determines its improved mechanical properties and high potential for use in membrane separation. Using TGA and mechanical analysis methods, it was found that this polymer has high thermal (T = 537 °C) and thermal-oxidative stability (T = 587 °C) and good mechanical properties (Young's module (E) = 1700 MPa, ultimate tensile stress (σ) = 44 MPa, elongation at break (ε) = 6%), which is important for making membranes workable under various conditions. The polymer showed a high separation factor for a mixture of 10% wt. benzene in n-hexane (126) at a benzene flow of 33 g/(mh).
本文介绍了具有改善的物理和化学性质的梯形聚倍半硅氧烷（L-PPSQ）的渗透汽化性能（针对苯/己烷混合物）和气体渗透性（针对氦气、氢气、氮气、氧气、一氧化碳、甲烷、乙烯和乙炔）的研究结果。这些聚合物是通过在氨介质中缩合四苯基环四硅氧烷四醇获得的。L-PPSQ的结构通过多种物理化学分析方法得以充分证实：氢谱、硅谱核磁共振、红外光谱、高效液相色谱、粉末X射线衍射以及溶液中的粘度测定。首次获得了高分子量的聚合物（数均分子量Mn = 238 kDa，重均分子量Mw = 540 kDa），这决定了其改善的机械性能以及在膜分离中使用的高潜力。使用热重分析和力学分析方法发现，该聚合物具有高热稳定性（热分解温度T = 537 °C）和热氧化稳定性（热氧化分解温度T = 587 °C）以及良好的机械性能（杨氏模量E = 1700 MPa，极限拉伸应力σ = 44 MPa，断裂伸长率ε = 6%），这对于使膜在各种条件下都能发挥作用很重要。该聚合物对于正己烷中10%重量的苯混合物在苯流量为33 g/(m·h)时显示出高分离因子（126）。
