| Project/Area Number |
63470097
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | Nagoya Institute of Technology, Dept. of Engineering |
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Principal Investigator |
YOKOTA Kenji Nagoya Institute of Technology Dept. of Eng., Professor, 工学部, 教授 (30024201)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥6,100,000 (Direct Cost: ¥6,100,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥4,900,000 (Direct Cost: ¥4,900,000)
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| Keywords | Comb-like polymer / Crystallization / Alternating styrene-acrylic ester copolymer / Polyester / Polyacetylene / Polyamide / Differential Scanning Calorimetry / 剛直高分子 / 長鎖アルキル基 |
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| Research Abstract |
To investigate the titled project, 4 types of comb-like polymers with long alkyl side chains were synthesized and the extent of the side-chain crystallization was determined by DSC method.
1) Alternating styrene-alkyl acrylate copolymers, in which methyl groups were cumulatively substituted at the alpha-positions of both monomer units: Cumulatively substituted methyl groups and the phenyl group in the styrene unit made the copolymer main-chain increasingly rigid and suppressed the extent of crystallization of the side-chain.
2) Polyesters from 2-alkyltrimethylene glycols and aliphatic diacids: Diacids up to henicosanedioic acid, and therefore comb-like polymers with the alkyl teeth appearing on every 15, 19, 23, 26 main-chain atoms were studied.
In such flexible polyester type comb-like polymers, side chain crystallization occurred easily in spite of their wide teeth spaces. The main-chain methylenes were also participated in the crystallization.
3) Polyacetylenes: High molecular weight polyacetylenes were obtained from 1-alkynes by using W and Mo catalysts. The rigid main-chain of polyacetylenes due to their carbon-carbon double bonds suppressed the side-chain crystallization when compared to the corresponding polyolefins.
4) Polyamides from 2-alkyltrimethylene diamines and aliphatic diacids: The double bond character of C-N in the amide linkage made the main-chain rigid and the extent of side-chain crystallization was smaller than the corresponding polyester comb-like polymers.
In summary, it was shown that the side-chain crystallization of various comb-like polymers was influenced by the rigidness (or flexibility) of the polymer main-chain in accordance with our structural model of crystallized comb-like polymers.
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