Dumbbell‐Shaped, Graft and Bottlebrush Polymers with All‐Siloxane Nature: Synthetic Methodology, Thermal, and Rheological Behavior. Issue 5 (21st December 2020)

• Record Type: Journal Article
• Authors: Goncharova, Irina K.; Tukhvatshin, Rinat S.; Kholodkov, Dmitry N.; Novikov, Roman A.; Solodilov, Vitaliy I.; Arzumanyan, Ashot V.
• Other Names: Brook Michael A. guestEditor.; Skov Anne L. guestEditor.
• Is Part Of: Macromolecular rapid communications. Volume 42:Issue 5(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-12-21
• Subjects: aerobic oxidation -- bottlebrush polymers -- dumbbell‐shaped polymers -- graft polymers -- Piers–Rubinsztajn reaction -- siloxanol; Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.202000645
• Languages: English
• ISSNs: 1022-1336

Abstract

Abstract: A methodology for synthesizing a wide range of dumbbell‐shaped, graft and bottlebrush polymers with all‐siloxane nature (without carbosilane linkers) is suggested. These macroarchitectures are synthesized from SiOH‐containing compounds—silanol (Et3 SiOH) and siloxanol dendrons of the first and second generations, with various peripheral substituents (Me or Et)—and from linear siloxanes comprising terminal and internal SiH groups by the Piers–Rubinsztajn reaction. Products and key building blocks are obtained in yields up to 95%. These polymers are heat and frost‐resistant siloxanes. As it turns out, the product physical properties are determined not only by the macromolecular structure, the linear chain length, the size and frequency of branched pendant, but also by the type of peripheral substituents—Me or Et—in the pendant. Thus, the viscosity of the graft polymers with branched pendant groups comprising peripheral Me‐groups is more than ≈3–5 fold lower than that of analogous polymers with peripheral Et‐groups. Abstract : A methodology for synthesizing dumbbell‐shaped, graft and bottlebrush polymers with all‐siloxane nature is suggested. They are synthesized from different generations and structure dendritic siloxanols and polyhydride‐siloxanes by the Piers–Rubinsztajn reaction. The product physical properties are determined not only by the macromolecular structure, the linear chain length, the size and frequency of branched pendant, but also by the type of peripheral pendant substituents: Me or Et.