Počet záznamů: 1
Characterization and properties of semicrystalline and amorphous perfluoropolymer: poly(perfluoro-2-methylene-1,3-dioxolane)
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SYSNO ASEP 0362881 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Characterization and properties of semicrystalline and amorphous perfluoropolymer: poly(perfluoro-2-methylene-1,3-dioxolane) Tvůrce(i) Mikeš, F. (US)
Baldrian, Josef (UMCH-V)
Teng, H. (US)
Koike, Y. (JP)
Okamoto, Y. (US)Zdroj.dok. Polymers for Advanced Technologies - ISSN 1042-7147
Roč. 22, č. 8 (2011), s. 1272-1277Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova fluoropolymers ; crystallization ; glass transition Vědní obor RIV CD - Makromolekulární chemie CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000293596700012 DOI 10.1002/pat.1974 Anotace The low and the high molecular weight poly(perfluoro-2-methylene-1,3-dioxolane)s were prepared using perfluorobenzoyl peroxide as a free radical initiator. Both polymers obtained were semicrystalline and insoluble in organic solvents. The glass transition temperatures (Tg) of polymers obtained were 94–106°C, and their melting points were 224–229°C. Wide-angle X-ray diffraction measurements showed that polymers as prepared are semi-crystalline (21% crystalline fraction) and the crystallinity increased to 47% after annealing at 170°C. However, the films prepared by heating (at 230–250°C) and pressing of the high molecular weight polymers are transparent and flexible. The refractive index of the film is 1.3320 and 1.3245 at 533 and 1546 nm, respectively. The transparent polymer films did not recrystallize while annealing below Tg, and they are chemically and thermally stable. This polymer may have potential applications in optoelectronic fields. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2012
Počet záznamů: 1