TY - JOUR
T1 - Fully Liquid-Crystalline ABA Triblock Copolymer of Fluorinated Side-Chain Liquid-Crystalline A Block and Main-Chain Liquid-Crystalline B Block
T2 - Higher Order Structure in Bulk and Thin Film States
AU - Ishige, Ryohei
AU - Ohta, Noboru
AU - Ogawa, Hiroki
AU - Tokita, Masatoshi
AU - Takahara, Atsushi
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI [Grant-in- Aid for Young Scientists (B), Grant No. 24750223]. Simultaneous SAXS and WAXD and GI-SAXS and GI-WAXD measurements using a synchrotron X-ray source were conducted at the BL40B2 and BL03XU beamlines in SPring-8, respectively, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI).
PY - 2016/8/23
Y1 - 2016/8/23
N2 - Fully liquid-crystalline (LC) ABA-type triblock copolymers were synthesized by atom transfer radical polymerization; the A block was a fluorinated side-chain LC polymer, PFA-C8, and the B block was a main-chain LC polyester, BB-5(3-Me). The volume fraction of the A block (ψA) was 0.11-0.70, and the B block had a constant molecular weight. Nanometer-scale segregated structures in the bulk and thin film states were investigated by synchrotron X-ray diffraction (XRD) in transmission and grazing-incidence (GI) geometries to examine the effect of competition between the LC orientation and polymer chain dimensions on the morphology. When ψA is 0.11, matching of the mesogen orientation in the A and B blocks dominates the main-chain orientation, whereas when ψA exceeds 0.28, matching of the lateral dimensions of the A and B blocks dominates the mesogen orientation, although all the polymers showed lamellar structure before isotropization of BB-5(3-Me). GI-XRD revealed that the lamellar structure in the thin film with ψA = 0.70 was completely perpendicular to the Si substrate without surface modification or solvent annealing.
AB - Fully liquid-crystalline (LC) ABA-type triblock copolymers were synthesized by atom transfer radical polymerization; the A block was a fluorinated side-chain LC polymer, PFA-C8, and the B block was a main-chain LC polyester, BB-5(3-Me). The volume fraction of the A block (ψA) was 0.11-0.70, and the B block had a constant molecular weight. Nanometer-scale segregated structures in the bulk and thin film states were investigated by synchrotron X-ray diffraction (XRD) in transmission and grazing-incidence (GI) geometries to examine the effect of competition between the LC orientation and polymer chain dimensions on the morphology. When ψA is 0.11, matching of the mesogen orientation in the A and B blocks dominates the main-chain orientation, whereas when ψA exceeds 0.28, matching of the lateral dimensions of the A and B blocks dominates the mesogen orientation, although all the polymers showed lamellar structure before isotropization of BB-5(3-Me). GI-XRD revealed that the lamellar structure in the thin film with ψA = 0.70 was completely perpendicular to the Si substrate without surface modification or solvent annealing.
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U2 - 10.1021/acs.macromol.6b00855
DO - 10.1021/acs.macromol.6b00855
M3 - Article
AN - SCOPUS:84983681786
SN - 0024-9297
VL - 49
SP - 6061
EP - 6074
JO - Macromolecules
JF - Macromolecules
IS - 16
ER -