1990 Fiscal Year Final Research Report Summary
Synthesis of liquid crystalline polymers with dimensional stability by using block copolymers
| Project/Area Number |
01550713
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
高分子合成
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| Research Institution | Fukui University |
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Principal Investigator |
KODAIRA Toshiyuki Fukui Univ., Fac. of Engineering, Professor, 工学部, 教授 (40020226)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Polysiloxane / Mesogenic Side Chain / Liquid Crystalline Polymer / Block Polymer / Polymer Reaction / Living Polymerization / Monodisperse Polymer / Methacrylate |
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| Research Abstract |
Block copolymers with LC polymeric chain as one component is considered to form LC with unique properties such as dimensional stability. The micro phase separated structure of the block copolymers allows LC polymeric chains to form LC phase and dimensional stability to be given by non-LC blocks. Based on these consideration, following attempts have been under-taken.
Telechelic polysiloxanes with mesogenic side group (TCMS) was synthesized and their reactions with chelic polymers were investigated to get ABA type block copolymers^<1,2)>. It was found that reactivity of TCMS is strongly dependent on their mesogenic side chain and the nature of chelics, which indicates that the conformation of the TCMS and chelics has strong influence on their reaction. The highest value of A/B obtained in the present investigation was approximately 1.3 in the case where polyethylene glycol monooleylether (n=50) was used as chelics. For this reason, properties aimed for could not be achieved by this synthetic route.
Living polymerization of methacrylates with mesogenic group (MsMA) has been established by using methyl aluminum porphyrin complex^<3)> and these systems have been utilized for the synthesis of AB type block copolymers. This is because a living polymerization normally allows the synthesis of block copolymers with narrow molecular weight distribution (MWD). In addition, it has been well known that typical properties of block copolymers can be realized by those with well defined block lengths. Living end of poly (methyl methacrylate) was reacted with MsMA to yield block copolymers with narror MWD. Thermal properties of the block copolymers suggested that they have micro phase separated structure and some of the copolymers showed liquid crystallinity. However, detailed studies on the properties of the block copolymers obtained are left to the future^<4)>.
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