Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 20, 2020
Previous Article Next Article

From isoselectivity to syndioselectivity: Lewis base regulates stereochemistry in 2-vinylpyridine polymerization

Author affiliations

Abstract

Poly(2-vinylpyridine) (P2VP) is a nitrogen-substituted analogue of polystyrene (PS). The first preparation of syndiotactic P2VP was realized using a (C5Me4SiMe3)Ln(CH2SiMe3)2(THF) (Ln = Sc, Y, Lu)/[Ph3C][B(C6F5)4] catalytic system for coordination polymerization of 2-vinylpyridine (2-VP). A strategy is reported for producing syndiotactic P2VP based on an isoselective catalytic system of 2-VP. The inhibition of THF coordination to the metal center of the catalyst shifts the stereocontrolled route to give syndiotactic P2VP, while catalysts with coordinated THF favor isotactic P2VP. Polymerization by the (C5Me4SiMe3)Sc(CH2SiMe3)2(THF)/[Ph3C][B(C6F5)4]/styrene catalytic system is the most stereoselective, yielding syndiotactic P2VP with syndioselectivity of Pr = 0.86. The Pr values of the polymers could be controlled in the range of 0.68 to 0.86 by adjusting the amount of Lewis base added. These syndiotactic polymers are crystalline materials, which displayed distinct melting point (Tm) values up to 138 °C.

Graphical abstract: From isoselectivity to syndioselectivity: Lewis base regulates stereochemistry in 2-vinylpyridine polymerization

Back to tab navigation

Supplementary files

Article information


Submitted
27 Feb 2020
Accepted
20 Apr 2020
First published
22 Apr 2020

Polym. Chem., 2020,11, 3434-3438
Article type
Paper

From isoselectivity to syndioselectivity: Lewis base regulates stereochemistry in 2-vinylpyridine polymerization

Y. Wang, J. Duan, Z. Liu and T. Xu, Polym. Chem., 2020, 11, 3434
DOI: 10.1039/D0PY00320D

Social activity

Search articles by author

Spotlight

Advertisements