The siloxane-terminated polymer can undergo condensation reaction with the hydroxyl groups on the surface of silica fillers, which often improves the dispersion of the filler in a rubber matrix, thereby advances the physical and chemical properties of natural rubber. Research in Tongji is currently underway to synthesize polymers with functionalized siloxane groups on both ends using anionic polymerization. Due to the high reactivity of methyl or ethyl siloxy compounds with carbanions, a large number of by-products have been found during the polymerization process, which causes a broaden distribution of the molecular weight distribution measured by GPC . In addition, the siloxane functional groups may form active silanol during the process of steam disolvenization, thereby lose the role of the siloxane group during compounding. In order to overcome the above difficulties, we try to explore some new synthesis approaches and novel functional initiators. In this report, polyols and polyphenols are used as bridging materials to prepare cyclic and bridged siloxane. Compared with the claw-shaped structure, the ring-shaped (bridged) structure is much more stable.

Synthesis and application of elastomers of dual-ended functionalization

ACS Spring 2022

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