• Title/Summary/Keyword: Protected isocyanate group

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Synthesis and Characterization of Polyacrylate Derivatives Baying Protected Isocyanate Groups and fluorinated Alkyl Groups (보호된 이소시아네이트기와 불소화 알킬기를 가지는 아크릴계 고분자의 합성과 특성)

  • 김우식;김민우;정은천;백창훈;박이순;강인규;박수영
    • Polymer(Korea)
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    • v.27 no.4
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    • pp.364-369
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    • 2003
  • The copolymerizations of 2-fluorohexylethyl acrylate (FA) with 2-(o-(1'-methylpropylidenamino)carboxyl amino)ethyl methacrylate(MEM) with different molar ratios of the two monomers were carried out in methyl ethyl ketone using ${\alpha}$,${\alpha}$'-azobisisobutyronitrile as an initiator to synthesize water repellent polyacrylate derivatives with protected isocyanate groups. The contents of FA and MEM in the copolymers were analyzed by NMR. The monomer reactivity ratios of MEM (1) and FA (2) were determined by Kelen-Tudos plot as follows : r$\_$1/=1.59 and r$\_$2/=0.50. The number-average molecular weights of the copolymers were in the range of 39400 to 72400 and the polydispersity indexes were about 1.5. The protected isocyanate groups in the copolymers were converted into isocyanate groups above 150$^{\circ}C$. The contact angle of the copolymer with 65 ㏖% of FA fur water was about 95$^{\circ}$.

Retention of Configuration; Mechanism Studies on the Reaction of Chlorosulfonyl Isocyanate with Ethers

  • Kim, Ji-Duck;Jung, Young-Hoon
    • Proceedings of the PSK Conference
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    • 2003.04a
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    • pp.242.2-243
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    • 2003
  • We have developed the novel one-pot synthetic method for regioselective N-protected amines, carbamates as a protective group of amines, through the reaction of various ethers with chlorosulfonyl isocyanate (CSJ). This synthetic method provides a simple and convenient alternative for the formation of carbamates, such as -NHMoc, -NHPoc. -NHCbz, -NHPnz, -NHTroc and -NHAloc, by varying the alkyl moiety of ethers. (omitted)

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