Issue 2, 2021

Synthesis and properties of block copolymers composed of norbornene/higher α-olefin gradient segments using ansa-fluorenylamidodimethyltitanium-[Ph3C][B(C6F5)4] catalyst system

Abstract

A series of di- and triblock copolymers composed of gradient norbornene (NB)/higher α-olefin (1-octene (O) or 1-dodecene (Do)) segments (NB/α-olefin-gradient segments) were synthesized with (t-BuNSiMe2Flu)TiMe2 (1) – [Ph3C][B(C6F5)4] using 2,6-bis(1,1-dimethylethyl)-4-methylphenol (BHT)-treated tri-n-octylaluminium (Oct3Al) as a scavenger. The copolymers were molded to form transparent films using a melt-pressing procedure. The strain at break behaviors of the block copolymer films were significantly improved by controlling the block length, NB mol fraction, and/or the type of α-olefin, without a corresponding loss of strength compared to the corresponding gradient copolymer films. This improvement in the mechanical properties of NB/α-olefin copolymers is expected to broaden their potential applications in optical and medical fields.

Graphical abstract: Synthesis and properties of block copolymers composed of norbornene/higher α-olefin gradient segments using ansa-fluorenylamidodimethyltitanium-[Ph3C][B(C6F5)4] catalyst system

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
24 Sep 2020
Accepted
23 Nov 2020
First published
24 Nov 2020

Polym. Chem., 2021,12, 189-195

Synthesis and properties of block copolymers composed of norbornene/higher α-olefin gradient segments using ansa-fluorenylamidodimethyltitanium-[Ph3C][B(C6F5)4] catalyst system

H. Yuan, T. Kida, R. Tanaka, Z. Cai, Y. Nakayama and T. Shiono, Polym. Chem., 2021, 12, 189 DOI: 10.1039/D0PY01370F

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