scholarly journals Side-Chain Liquid Crystal Block Copolymers with Well-Defined Structures Prepared by Living Anionic Polymerization I. Thermotropic Phase Behavior and Structures of Liquid Crystal Segment in Lamellar Type of Microphase Domain

1998 ◽  
Vol 30 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Masayuki Yamada ◽  
Tsukasa Iguchi ◽  
Akira Hirao ◽  
Seiichi Nakahama ◽  
Junji Watanabe
Keyword(s):  
Liquid Crystal ◽  
Block Copolymers ◽  
Phase Behavior ◽  
Anionic Polymerization ◽  
Side Chain ◽  
Living Anionic Polymerization ◽  
Crystal Block ◽  
Lamellar Type

scholarly journals A controlled synthesis method of alkyl methacrylate block copolymers via living anionic polymerization at ambient temperature

RSC Advances ◽  
2019 ◽  
Vol 9 (28) ◽  
pp. 16049-16056 ◽  
Author(s):  
Zheng Li ◽  
Jianding Chen ◽  
Guijin Zou ◽  
Tongyuan Zhang ◽  
Dafu Wei ◽  
...  
Keyword(s):  
Block Copolymers ◽  
Ambient Temperature ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Synthesis Method ◽  
Controlled Synthesis ◽  
Living Anionic Polymerization ◽  
Alkyl Methacrylate ◽  
High Yields

A series of well-defined diblock copolymers containing PMMA, PEMA and PBMA blocks were synthesized with narrow MWDs and high yields via anionic polymerization, while t-BuOK was selected as initiator in THF at 0 °C. .

Side-Chain LC Block Copolymers with Well Defined Structures Prepared by Living Anionic Polymerization. 2: Effect of the Glass Transition Temperature of Amorphous Segments on the Phase Behaviour and Structure of the LC Segment

1998 ◽  
Vol 10 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Masayuki Yamada ◽  
Tomomichi Itoh ◽  
Akira Hirao ◽  
Sei-Ichi Nakahama ◽  
Junji Watanabe
Keyword(s):  
Glass Transition ◽  
Anionic Polymerization ◽  
Diblock Copolymers ◽  
Domain Size ◽  
Phase Behaviour ◽  
Side Chain ◽  
Isotropic Phase ◽  
Transition Temperatures ◽  
Living Anionic Polymerization ◽  
Methyl Styrene

We have prepared two classes of LC diblock copolymers, OcSt-b-LC and MeStb-LC, by living anionic polymerization. These are composed of the side-chain LC polymer as one segment and two different amorphous polymers, poly(octyl styrene) (OcSt) and poly(α-methyl styrene) (MeSt), as the other segment. OcSt and MeSt segments have glass transition temperatures of −60 °C and 160 °C respectively, which are relatively lower and higher than the transition temperatures of crystal–SA (∼90 °C) and SA–isotropic (∼130 °C) in the LC segment. In OcSt-b-LC the lamellar domain size decreases gradually from that of the crystal phase to that of the isotropic phase, indicating that the global conformation of the backbone changes throughout the SA temperature region. In MeSt-b-LC, in contrast, no change in the lamellar size is observed and the crystallinity of the LC segment is reduced in comparison with that in OcSt-b-LC while the liquid crystal is well formed. Such a distinction between two copolymer systems, arising from an interplay between the LC and amorphous segments, shows that the global conformation of the backbone is significant for understanding the phase behaviour and structure of side-chain LC polymers.

Sign in / Sign up

Export Citation Format

Share Document