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Structure and Properties of Poly(1-trimethylsilyl-1-propyne) Synthesized Using NbF 5 - and TaF 5 -Containing Catalytic Systems
Polymer Science, Series B ( IF 1.2 ) Pub Date : 2021-04-08 , DOI: 10.1134/s1560090421020068
A. A. Kossov , I. S. Levin , N. A. Zhilyaeva , E. G. Litvinova , V. S. Khotimskiy , S. M. Matson

Abstract

The polymerization of 1-trimethylsilyl-1-propyne mediated by catalytic systems based on Nb and Ta pentafluorides is carried out. Using solid-state 13С NMR spectroscopy, it is shown that the catalysts based on group V metal fluorides possess a well-defined trans-stereoregulating ability and produce trans-enriched polymers compared with analogous samples synthesized using Nb and Ta chlorides and bromides since they have a smaller ligand at the active center of the growing chain. A high trans-stereoregularity of poly(1-trimethylsilyl-1-propyne) is responsible for its insolubility in organic solvents. As evidenced by low-temperature argon sorption, all the synthesized polymers have high BET specific surface area (above 600 m2/g) and micropore volume (above 0.30–0.45 cm3/g). In combination with resistance against organic compounds, this makes them attractive materials for use as fillers of composite membranes and sorbents for the sorption of gases and vapors of organic compounds from streams of commercial mixtures of various composition.



中文翻译:

含NbF 5和TaF 5的催化体系合成的聚(1-三甲基甲硅烷基-1-丙炔)的结构和性能

摘要

通过基于Nb和五氟化钽的催化体系进行的1-三甲基甲硅烷基-1-丙炔的聚合反应。使用固态13 СNMR谱,其示出了基于V族金属氟化物催化剂用,因为它们使用Nb和Ta的氯化物和溴化物合成类似的样品相比,具有良好定义的反式立体调节能力,并产生反式富集聚合物在生长链的活性中心具有较小的配体。聚(1-三甲基甲硅烷基-1-丙炔)的高反式正规性是其在有机溶剂中的不溶性的原因。正如低温氩吸附所证明的那样,所有合成的聚合物都具有较高的BET比表面积(600 m 2 / g以上)和微孔体积(0.30–0.45 cm 3以上)/G)。结合对有机化合物的抵抗力,这使它们成为有吸引力的材料,可用作复合膜的填料和吸附剂,用于从各种组成的商业混合物流中吸附有机化合物的气体和蒸汽。

更新日期:2021-04-08
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