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Study on the Blend of Polymethacrylates with Vinyl Chloride-Vinylidene Chloride Copolymer
Cho, Won Jei,R. E. PRUD'HOMME 부산대학교 공과대학 1985 硏究報告 Vol.30 No.-
폴리메틸메타아크릴레이트, 폴리에틸메타아크릴레이트, 폴리n-프로필메타아크릴레이트, 폴리글리시딜메타아크릴레이트, 폴리히드록시프로필메타아크릴레이트, 폴리이소프로필메타아크릴레이트, 폴리n-부틸메타아크릴레이트, 폴리이소부틸메타아크릴레이트, 폴리t-부틸메타아크릴레이트, 폴리n-아밀메타아크릴레이트, 폴리n-헥실메타아크릴레이트, 폴리시클로헥실메타아크릴레이트, 폴리페닐메타아크릴레이트와 비닐클로라이드와 비닐리덴클로라이드의 공중합체 [P(VC-VCl₂)]와의 블랜드에 대한 상용성을 시차주사열량분석을 이용해서 측정하였다. 폴리메틸메타아크릴레이트, 폴리에틸메타아크릴레이트, 폴리n-프로필메타아크릴레이트, 폴리이소프로필메타아크릴레이트, 폴리n-부틸메타아크릴레이트, 폴리이소부틸메타아크릴레이트, 폴리s-부틸메타아크릴레이트, 폴리n-아밀메타아크릴레이트, 폴리n-헥실메타아크릴레이트, 폴리시클로헥실메타아크릴레이트, 폴리페닐메타아크릴레이트와 P(VC-VCl₂)와의 블랜드는 상응하는 단일중합체의 T_(g)값들 사이의 중간치의 온도에서 단일 Tg값을 가지기 때문에 이들 블랜드가 상용한다는 것을 알았다. 폴리글리시딜메타아크릴레이트, 폴리히드록시프로필메타아크릴레이트, 폴리t-부틸메타아크릴레이트와 P(VC-VCl₂)와의 블랜드는 상응하는 단일중합체들의 T_(g)값에 가까운 2개의 T_(g)값들을 나타내었으며, 이들 블랜드들은 상용하지 않았다. 폴리페닐메타아크릴레이트와 P(VC-VCl₂)의 블랜드에 관한 결정응점강하 자료치로부터 열역학적 상호작용 파라미터 x_(12)는 -0.41과 같다는 것을 알았다. 폴리메타아크릴레이트들과 P(VC-VCl₂)와의 블랜드에서 폴리메타아크릴레이트의 상용성은 폴리메타아크릴레이트의 치환기의 극성효과보다 입체효과에 더 의존한다.
Yeun-Shin Keum,In Kyu Lee,Draisma, Willem F. Prud' homme van Reine,Stefano G. A.,Jung Hyun Oak 한국조류학회I 2005 ALGAE Vol.20 No.1
The taxonomic status of three closely related species of the genus Sphacelaria, S. rigidula Kützing, S. fusca (Hudson) C.F Gray and S. didichotoma Saunders was reassessed on the basis of morphological observations from herbarium specimens and phylogenetic analysis of RUBISCO spacer sequences. Sphacelaria rigidula was characterized by having only 2-armed propagules and somewhat slender filaments. Culture experiments revealed that its propagules commonly formed secondary arms, even though they were rarely produced in the field. It is concluded that S. divaricata Montagne characterized by dichotomously branched arms in propagules shoud be synonymized with S. rigidula, based on propagule morphology and measurements. Sphacelaria fusca clearly be separated from S. rigidula by having 2-4 armed propagules. These morphological differences were highly supported by the differences in the RUBISCO spacer sequences. S. didichotoma resembles S. rigidula in having propagules with two dichotomously branched arms. However, it commonly produces the secondary arms in the field. Additionally, this species has shorter primary arms than S. rigidula. Phylogenetic analyses supported the distinction of S. didichotoma from S. rigidula. The northwestern Pacific plants, previously recorded as S. divaricata, were recognized as S. didichotoma.
Keum, Yeon-Shim,Oak, Jung-Hyun,Draisma, Stefano G.A.,van Reine, Willem F. Prud'homme,Lee, In-Kyu The Korean Society of Phycology 2005 ALGAE Vol.20 No.1
The taxonomic status of three closely related species of the genus Sphacelaria, S. rigidula Kützing, S. fusca (Hudson) C.F Gray and S. didichotoma Saunders was reassessed on the basis of morphological observations from herbarium specimens and phylogenetic analysis of RUBISCO spacer sequences. Sphacelaria rigidula was characterized by having only 2-armed propagules and somewhat slender filaments. Culture experiments revealed that its propagules commonly formed secondary arms, even though they were rarely produced in the field. It is concluded that S. divaricata Montagne characterized by dichotomously branched arms in propagules shoud be synonymized with S. rigidula, based on propagule morphology and measurements. Sphacelaria fusca clearly be separated from S. rigidula by having 2-4 armed propagules. These morphological differences were highly supported by the differences in the RUBISCO spacer sequences. S. didichotoma resembles S. rigidula in having propagules with two dichotomously branched arms. However, it commonly produces the secondary arms in the field. Additionally, this species has shorter primary arms than S. rigidula. Phylogenetic analyses supported the distinction of S. didichotoma from S. rigidula. The northwestern Pacific plants, previously recorded as S. divaricata, were recognized as S. didichotoma.