Carboxyl-functionalized polyhedral oligomeric silsesquioxane (SQ; POSS-COOH) was successfully prepared by a structural transformation reaction, that is, a process of heating and concentrating soluble carboxyl-functionalized rod-like polySQ (PolySQ-COOH) using the aqueous superacid trifluoromethanesulfonic acid (HOTf) as the catalyst and solvent. The obtained POSS-COOH was a mixture of a cage-like decamer (T₁₀-POSS), which was the main product, and an octamer (T₈-POSS) and a dodecamer (T₁₂-POSS), which were the minor products. The product obtained by heating and concentrating PolySQ-COOH using aqueous hydrochloric acid (HCl) as the catalyst and solvent was soluble polySQ rather than POSS. For comparison, heating and concentrating POSS-COOH in aqueous HOTf and HCl were performed, which yielded POSS-COOH and PolySQ-COOH, respectively. Based on these results, the process of heating and concentrating each starting material (PolySQ-COOH and POSS-COOH) in aqueous HOTf afforded POSS-COOH, and a similar process in aqueous HCl yielded PolySQ-COOH. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 2511–2518

中文翻译：

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可溶性棒状聚倍半硅氧烷通过结构转变反应制备羧基官能化多面体低聚倍半硅氧烷

羧基官能化多面体低聚倍半硅氧烷 (SQ; POSS-COOH ) 通过结构转变反应成功制备，即使用超强酸三氟甲磺酸水溶液加热和浓缩可溶性羧基官能化棒状聚 SQ (PolySQ -COOH ) 的过程(HOTf) 作为催化剂和溶剂。得到的POSS-COOH是主要产物笼状十聚体(T ₁₀ -POSS)和次要产物八聚体(T ₈ -POSS)和十二聚体(T ₁₂ -POSS)的混合物产品。PolySQ-COOH加热浓缩得到的产物使用盐酸水溶液 (HCl) 作为催化剂和溶剂是可溶性​​ polySQ 而不是 POSS。为了比较，在 HOTf 和 HCl 水溶液中加热和浓缩POSS-COOH，分别产生POSS-COOH和PolySQ-COOH。基于这些结果，在 HOTf 水溶液中加热和浓缩每种起始材料（PolySQ-COOH和POSS-COOH）的过程得到了POSS-COOH，在 HCl 水溶液中的类似过程得到了PolySQ-COOH。© 2019 Wiley Periodicals, Inc. J. Polym。科学，A 部分：Polym。化学。2019 , 57 , 2511–2518