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Synthesis of bottlebrush block copolymers from bottlebrush polystyrene and bottlebrush random copolymer of ω ‐end‐norbornyl polymethacrylates and their self‐assembly
Author(s) -
Seo HoBin,
Kim MyungJin,
Yu YongGuen,
Chae ChangGeun,
Lee JaeSuk
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200148
Subject(s) - copolymer , materials science , polymer chemistry , polystyrene , norbornene , methyl methacrylate , polymerization , lamellar structure , polymer , composite material
Six different bottlebrush block copolymers (BBCPs) (A‐ b ‐(B‐ co ‐C)) from bottlebrush polystyrene (A) and bottlebrush random copolymers (B‐ co ‐C) of polymethacrylates were synthesized through living anionic polymerization and ring‐opening metathesis polymerization. To induce the phase separation of bottlebrush polystyrene (PNB‐ g ‐PS) (A) and bottlebrush poly(benzyl methacrylate) (PNB‐ g ‐PBzMA) (C)‐based BBCP with an extremely low Flory–Huggins interaction parameter ( χ ), three kinds of bottlebrush polymethacrylates (B): poly(norbornene‐ g ‐methyl methacrylate) (PNB‐ g ‐PMMA), poly(norbornene‐ g ‐ tert ‐butyl methacrylate) (PNB‐ g ‐P t BMA), and poly(norbornene‐ g ‐methacrylic acid) (PNB‐ g ‐PMAA), respectively, were randomly combined with C. An order–disorder phase transition of the BBCPs (A‐ b ‐(B‐ co ‐C)) was observed with a change in mole ratios of PMMA, P t BMA, or PMAA to PBzMA of 25, 50, and 75% in random copolymer blocks using field‐emission scanning microscopy. While the BBCP with 25% of PMAA in the random copolymer block showed an ordered lamellar nanostructure, a disordered morphology was revealed at 75% PMAA. SEM showed that the incorporation of P t BMA and PBzMA showed better‐ordered lamellar morphologies than was the case with PMMA and PBzMA at the same mole ratios.