Fluorine-containing polymers preparation

Considerable attention has also been devoted to the preparation of fluorine-containing polymers because of their unique properties and high-temperature... 

Block and graft copolymers were prepared by Akutin, Parlashke-vich, Kogan, Kalinina, and Menes (128) by the use of ultrasonics on solutions of fluorine containing polymers or polysiloxanes on one hand and polymethyl methacrylate, polyvinyl chloride, ethylcellulose on the other. 

For example, there is considerable interest in the preparation of sulfur-nitrogen polymers that have organic substituents on the sulfur atoms.56 This could help alleviate the intractability problem mentioned, and could also give rise to a series of polymers that parallel the phosphazenes in their structural variability. A series of polymers with S-N backbones of this type has been prepared, but with oxygen atoms as some of the substituents. The basic structure has the repeat unit -RS(=0)(N)- or -FS(=0)(N)-but they have not yet been studied in detail. The fluorine-containing polymer, however, is known to be a tough elastomer which is unaffected by water, acids, or bases up to 100 °C.7... 

Also, low molecular weight fluorine-containing polymers form from peifluoroaromatic compounds through a loss of aromaticity when they react with bis(fluoroxy)difluoromethane. More interesting is the formation of poly(a,a,a, a -tetrafluoro-/7-xylylene) by a polymerization technique that closely resembles the preparation of poly(p-xylylene) by vacuum pyrolysis of a dimer ... 

In recent years, considerable attention hcis been devoted to the preparation of fluorine-containing polymers due to their unique properties and high-temperature performance. The incorporation of fluorine atoms (or groups containing fluorine atoms) into polymer chains changes solubility of polymers, glass transition temperature (T ) and thermal stability, while also led to decreased moisture absorption and dielectric constant. The aromatic fluoropolymers have currently been used as films, coatings microelectronics devices [37,55-60]. 

Considerable attention has been devoted to the preparation of fluorine-containing polymers because of their unique properties and high temperature performance (I). Recently we reported the preparation and characterization of novel fluorine-containing polyimides and polyethers which exhibit low moisture absorption and low dielectric constants (2, 3). Fluorinated polyimides absorb 1 wt% water and have dielectric constants of about 2.8 (all dielectric constants reported in this paper were measured at 10 kHz) vtdiereas their non-fluorinated analogs absorb as much as 3 wt% water and have dielectric constants of about 3.2. Fluorinated polyarylethers, which are free of polar groups such as ketones, imides and sulfones, absorb as little as 0.1 wt% water and have dielectric constants less than 2.8. 

Recently the synthesis and characterization of novel fluorinated poly(aryl ether)s containing perfluorophenylene moieties " " was also reported. These fluorinated polyethers were prepared by reaction of decafluorobiphenyl with bisphenols. These polymers exhibit low dielectric constants, low moisture absorption, and excellent thermal and mechanical properties. Tough, transparent films of the polymers were prepared by solution-casting or compression-molding. The fluorinated poly(aryl ether)s containing perfluorophenylene moieties are good candidates for use as coatings in microelectronics applications. 

Fluorine containing organic compound is also important to prepare solid polymer electrolyte, which is very attractive as a novel electrolyte system [72-74]. At the initial stage of polymer electrolyte development, simple electrolyte salts, such as LiPF6 and LiC104, are used in rechargeable lithium batteries. However, their... 

Fluorine-containing photosensitive polymers, (I), containing a gemdiol component were prepared by Yoon [1] and used in resist compositions. 

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