Periodic Nano-Structure Formed by ABA-Type Liquid-Crystalline Triblock Copolymer Containing Fluoroalkyl Side-Chain

2015 Fiscal Year Final Research Report

• Project/Area Number: 24750223
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Polymer/Textile materials
• Research Institution: Tokyo Institute of Technology (2014-2015); Kyoto University (2013); Kyushu University (2012)
• Principal Investigator: ISHIGE Ryohei 東京工業大学, 理工学研究科, 助教 (20625264)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: トリブロック共重合体 / 主鎖型液晶性高分子 / 側鎖型液晶性高分子 / パーフルオロアルキル / 小角X線散乱 / 広角X線回折 / 放射光

Outline of Final Research Achievements

Liquid-crystalline (LC) ABA-type triblock copolymer was synthesized by ATRP method, where 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). Volume fraction of PFA-C8 in the copolymer (φA) was 0.11 to 0.70 and B-block had constant molecular weight. All the samples was found to form nm-scale segregated lamellar structure by TEM observation and SAXS and WAXD methods in transmitted and grazing-incidence geometry using synchrotron X-ray source. We discussed the effect of competition between LC orientation and the polymer-chain dimension on the morphology. When φA is 0.11, matching of the orientation between the mesogens in A and B block dominated the orientation of the main-chains, whereas, when φA is larger than 0.28, matching between lateral dimensions of A and B blocks dominated the orientation of the mesogens, even though all the polymers showed lamellar structure before isotropization of BB-5(3-Me).

Free Research Field

高分子構造