Počet záznamů: 1
Characterization and properties of semicrystalline and amorphous perfluoropolymer: poly(perfluoro-2-methylene-1,3-dioxolane)
0362881 - UMCH-V 2012 RIV GB eng J - Článek v odborném periodiku
Mikeš, F. - Baldrian, Josef - Teng, H. - Koike, Y. - Okamoto, Y.
Characterization and properties of semicrystalline and amorphous perfluoropolymer: poly(perfluoro-2-methylene-1,3-dioxolane).
Polymers for Advanced Technologies. Roč. 22, č. 8 (2011), s. 1272-1277 ISSN 1042-7147
Výzkumný záměr: CEZ:AV0Z40500505
Klíčová slova: fluoropolymers * crystallization * glass transition
Kód oboru RIV: CD - Makromolekulární chemie
Impakt faktor: 2.007, rok: 2011
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.
Trvalý link: http://hdl.handle.net/11104/0199058