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High-quality SNP calling from olive flounder, Paralichthys olivaceus, in Jeju Island, South Korea
Sukkyoung Lee,Taehyug Jeong,W.K.M. Omeka,D.S. Liyanage,Chaehyeon Lim,Kishanthini Nadarajapillai,H.M.V. Udayantha,W.M. Gayashani Sandamalika,Seong-Rip Oh,David B. Jones,Dean R. Jerry,Jehee Lee 한국수산과학회 양식분과 2021 한국수산과학회 양식분과 학술대회 Vol.2021 No.4
Synthesis and Characterization of Poly(ethynyldimethylsilane-co-dimethylsiloxanes). Ⅱ.
( Choi Hae-kyun ),( Baek Jong-bum ),( Seo Kwan-ho ),( P. R. Jones ),( W. Brostow ) 한국공업화학회 1992 한국공업화학회 연구논문 초록집 Vol.1992 No.0
Silicone polymers have been known for their exceptional ability to exhibit and retain superior chemical properties over a broad temperature range. The main interests in these materials stems from the fact that they can be possessd unique properties such as good low-temperature flexibility, chemical inertness and water repellency etc. Poly(ethynyldialkylsilanes) can be considered as siloxane analogs having lone pair electrons on oxygen have been replaced by the C≡C linkage having two π electron pairs. We were able to prepare as the alkynyl analogs of -[Si(CH<sub>3</sub>)<sub>2</sub>O]<sub>n</sub>-, n=1, 2, 3, …, and -[Si(CH<sub>3</sub>)<sub>2</sub>C≡C]<sub>m</sub>-, m=2, 3, 4, …, which they are stable, separable compounds. As a result that poly(ethynyldialkylsilanes) were very rigid and high crystalline materials and siloxane were known as a very flexible substances. Therefore, the polymer having various thermal properties can be got from these synthesized monomers by combination of m and n. In this study, we synthesized the ethynyldimethylsilanes winch have various unit lengths from the digrignard ethyne and diohlorodimethylsilane in THF as a solvent. Then we prepared the poly(ethynyldimethylsilane-co-dimethylsiloxanes), -[{Si(CH<sub>3</sub>)<sub>2</sub>C≡C}<sub>m+1</sub>-{Si(CH<sub>3</sub>)<sub>2</sub>O}<sub>1</sub>]<sub>n</sub>-, from various ethynyldimethylsiloxanes and dichlorotetramethylsiloxane by using the grignard reaction or Cul catalyst. These polymers were identified by IR and NMR. Their molecular weights and molecular weight distributions were measured by GPC. Their thermal properties were investigated by DSC and TGA.