Creating Remarkably Moisture‐ and Air‐Stable Macromolecular Lewis Acid by Integrating Borane within the Polymer Chain: A Highly Active Catalyst for Homo(co)polymerization of Epoxides

Author:

Gu Yanru1,Kou Xinhui2,Wang Xiaowu1ORCID,Li Zhibo134ORCID

Affiliation:

1. College of Chemical Engineering Qingdao University of Science and Technology 53 Zhengzhou Road 266042 Qingdao China

2. Analyses and Testing Center Qingdao University of Science and Technology 53 Zhengzhou Road 266042 Qingdao China

3. College of Polymer Science and Engineering Qingdao University of Science and Technology 53 Zhengzhou Road 266042 Qingdao China

4. Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOE Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular Engineering Qingdao University of Science and Technology 53 Zhengzhou Road 266042 Qingdao China

Abstract

AbstractBorane‐based Lewis acids (LA) play an indispensable role in the Lewis pair (LP) mediated polymerization. However, most borane‐based LPs are moisture‐ and air‐sensitive. Therefore, development of moisture and air‐stable borane‐based LP is highly desirable. To achieve this goal, the concept of “aggregation induced enlargement effects” by chemically linking multiple borane within a nanoscopic confinement was conceived to create macromolecular LA. Accordingly, an extremely moisture and air stable macromolecular borane, namely, PVP‐1B featuring poly(4‐vinylphenol) backbone, was constructed. The concentration of borane active site is greatly higher than average concentration due to local confinement. Therefore, an enhanced activity was observed. Moreover, the local LA aggregation effects allow its tolerance to air and large amount of chain transfer agent. Consequently, PVP‐1B showed remarkable efficiency for propylene oxide (PO) polymerization at 25 °C (TOF=27900 h−1). Furthermore, it enables generation of well‐defined telechelic poly (CHO‐alt‐CO2) diol (0.6–15.3 kg/mol) with narrow Đs via copolymerizing cyclohexene oxide and CO2 at 80 °C. This work indicates unifying multiple borane within a polymer in a macromolecular level shows superior catalytic performance than constructing binary, bi(multi)functional systems in a molecular level. This paves a new way to make functional polyethers.

Funder

National Key Research and Development Program of China

Publisher

Wiley

Subject

General Medicine

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