O-Fluorostyrenes

Fig. 5. Miscibility of poly(2,6-dimethyl phenylene oxide) (PPO) and random copolymers of styrene and o-bromostyrene (7), p-fluorostyrene (2), p-bromostyrene (i), o-chlorostyrene (4), p-chlorostyrene (5), and o-fluorostyrene (<5) for 50/50 blends. Miscibility occurs to the left of the curves (after Ref. [29])...

PPO and poly(o-fluorostyrene-rnn-p-fluorostyrene) one phase region between 7 and 42 mol% p-fluorostyrene [29]... 

Abbreviations for Table 2.19 PHMA - poly-n-hexyl methacrylate, STVPh - polystyrene-co-vinylphenol, PFSt - poly(o-fluorostyrene-co-p-fluorostyrene), P(S-co-BrS) - poly(styrene-co-4-bromostyrene), N-TPI - new thermoplastic polyimide , PPrA - poly-n-propyl acrylate, PPeA - poly-n-pentyl acrylate,... 

Polyfluorostyrenes are described in many publications. A -fluorostyrene can be formed by a cationic mechanism. The material softens at 240-260 °C. An a,, jff -trifluorostyrene can be polymerized by a free-radical mechanism to yield an amorphous polymer that softens at 240 Ring-substimted styrenes apparently polymerize similarly to styrene. Isotacticpoly(o-fluorostyrene) melts at 265 °C. It forms by polymerization with Ziegler-Natta catalysts. The meta analog, however, polymerized under the same conditions, yields an amorphous material. 

Maeda Y., Karasz F., MacKnight W., (1984), Effect of Pressure on Phase Behavior in Polymer Blends of Poly (2,6-Dimethyl-1, 4-Phenylene Oxide) and Poly (o-Fluorostyrene-co-/ -Fluorostyrene) Copolymers,... 

Fig. 5. Miscibility of PRO with random copolymer of o-fluorostyrene and p-chlorostyrene (curve I), copolymer of o-fluorostyrene and p-fluorostyrene (curve 2), and copolymer of o-chlorostyrene and p-chlorostyrene (curve 3). The insides of the curves represent the miscibility regions. (From ten Brinke, Karasz, and MacKnight )...

When the ratio r/R is different from 1 the form of the chains may be approximated by a cylinder in which hollows and bulges are periodically repeated that is, the chains have an outside envelope similar to a screw [1] (Fig. 2.11a). If the ratio r/R is very small, close to 0.1-0.2, such as for chains in threefold helical conformation, a trigonal packing of enantiomorphous chains may arise. Each 3i right-handed chain is surrounded by three left-handed isoclined or anticlined chains, and vice versa (space group R3c or R3, respectively), such as in iPS (Fig. 2.12a) [40], form I of iPB (Fig. 2.12b) [45], poly (vinyl methyl ether) [83], isotactic l,2-poly(l,3-butadiene) [84], and isotactic poly(o-fluorostyrene) [8. ... 

Copolymers of different monomeric units that are able to co-crystallize in the same lattice are classic examples of polymer crystals including disorder due to isomorphic substitution of monomeric units in the crystal lattices. This occurs for instance for isotactic butene-3-methylbutene [3] or styrene-o-fluorostyrene [4] copolymers and isotactic [5-8] and syndiotactic [9, 10] propene-butene copolymers, which are crystalline in the whole range of compositions. In these cases the constitutional disorder due to the presence of mono-... 

Vinyl naphthalene 3-Vinyl pyrene Methyl-alt-p-phenylene m-Chlorostyrene p-Chlorostyrene m-Fluorostyrene o-Fluorostyrene p-Fluorostyrene Styrene... 

---