Poly ethylidene

Interaction gives the extremely explosive poly(ethylidene) peroxide, also formed on warming peroxidised diethyl ether. 

In all of the above discussions we have treated only the monomers with carbon-carbon double-bonds. It is probable that polymers of non-oleftnic monomers such as polypropylene oxide (103, 104, 105) poly-ethylidene (106, 107, 108, 109) and polyaldehydes (110, 111) polymerize to isotactic structures by the same mechanism. The same correlation of ionicity of the catalysts with the isotactic structures and syndiotactic structures should also be possible. 

Poly([7,8-bis(trifluoromethyl)tetracyclo [4.2.0.02 8.05 7]octane-3,4-diyl]-1,2-ethenediyl), 3457 Poly[borane(l)], 0134 crs-Poly (butadiene), 1480 Poly(l,3-butadiene peroxide), 1528 Poly(butadiyne), 1382 Poly(carbon monofluoride), 0336 Poly(chlorotrifluoroethylene), 0589 Poly(l,3-cyclohexadiene peroxide), 2380 Poly(cyclopentadienyltitanium dichloride), 1837 Poly(diazidophosphazene), 4781 Poly(dibromosilylene), 0282 Poly(difluorosilylene), 4324 Poly(dihydroxydioxodisilane), 4474 Poly(dimercuryimmonium acetylide), 0665 Poly(dimercuryimmonium azide), 4606 Poly(dimercuryimmonium bromate), 0253 Poly (dimercury immonium iodide hydrate), 4449 Poly (dimercury immonium perchlorate), 4006 Poly(dimercuryimmonium permanganate), 4603 Poly (dime thylketene peroxide), see Poly(peroxyisobutyrolactone), 1531 Poly(dimethylsiloxane), 0918 Poly(disilicon nitride), 4752 Poly(ethenyl nitrate), see Poly(vinyl nitrate), 0760 Poly(ethylene), 0778 Poly(ethylene terephthalate), 3256 Poly(ethylidene peroxide), 0831 Poly(furan-2,5-diyl), 1398 Poly(germanium dihydride), 4409 Poly(germanium monohydride), 4407 Poly(isobutene), 1578 Poly(methyl methacrylate peroxide), 1913... 

I Methyl methacrylate, 1915 Oxy gen (Gas), Cyclooctatetraene, 4831 Oxygen (Gas). Tetrafluoroethylene, 4831 Poly(l,3-butadiene peroxide). 1533 Poly (1,3-cyclohexadiene peroxide), 2386 Poly (dimetlryIketene peroxide). 1536 Poly (ethylidene peroxide). 0835... 

Polymers with one stereoisomeric center per base unit are called monotactic. Examples of monotactic polymers are poly(ethylidene), - CH(CH3)-3h, with one central asymmetric atom per chain link, poly-(propylene), - H2—CH(CH3>, with one asymmetric central atom per two chain links, and poly(propylene oxide), - CH2—CH(CH3)—O, with one asymmetric central atom per three chain links. 

FIGURE 10 Effect of thickness on duration of drug release frona pol5nner discs prepared from 3,9-bis(ethylidene-2,4,8,10-tetraoxaspiro-[5,5]undecane) and a 50 50 mole ratio of trans-cyclohexane dimethanol and 1,6-hexanediol at pH 7.4 and 37°C. Polymer contains 4 wt% drug and 0.2 wt% poly(sebasic anhydride). (From Ref. 20.)... 

Fluorophenyl)sulf onyl]phenoxy]phenyl]-1-methyl-ethyl ]phenyl]- -[4-[(4-fluorophenyl)sulf onyl]phenoxy]poly[oxy-1, 4-phenylenesulfonyl-1,4-phenyleneoxy-l,4-phenylene(1-methyl ethylidene)-l,4-phenylene] III... 

Research Focus Synthesis of curable poly(ethylene-co5-ethylidene-2-norbomene) copolymers using a catalyst pair consisting of iron and zirconium metal complexes. 

These requirements have met using a mixed catalystic system consisting of an iron catalyst complex that can oligomerize ethylene and a zirconium transition metal complex that can copolymerize ethylene and the nonconjugated monomer 5-ethylidene-2-norbomene. Using this catalytic pair nonbrancy poly(ethylene-co5-ethylidene-2-norbomene) and poly (ethylene-col,4-hexadiene) were prepared. 

When 2,2-disubstituted 1,3-dioxolanes were employed, mono- or poly-chlorination of the side chain was observed on the carbon atom a to the acetal grouping. Incidentally, it should be noted thatN-bromo-succinimide, N-chlorosuccinimide, and trichlorotetrahydrotriazine-trione were found to be effective for the preparation of bromoacetates from O-ethylidene derivatives this might be useful when O-benzyli-dene derivatives are not readily available, or when a problem arises due to the fact thatO-benzoyl groups are, in general, more difficult to remove than O-acetyl groups. 

EPDM with different contents of 5-ethylidene-2-norbornene (VISTALON 7500 (VIST), EXXON, 0.7 mol. kg 1 POLYSAR 585, (POLY) HOECHST, 1.0 mol. kg 1) and polyoctenamer (VESTENAMER, (VEST) HULS, 9.1 mol. kg 1) were first precipitated from toluene solutions to remove possible additives. 

Crosslinked poly(ortho esters) are prepared by a reaction sequence in which an excess of the diketene acetal 3,9-bis(ethylidene 2,4,8,10-tetraoxaspiro [5,5] undecane) is reacted with a diol, and the ketene acetal terminated prepolymer is then crosslinked with a triol. Because the prepolymer is a viscous liquid at room temperature, the therapeutic agent and any excipients used are incorporated into the prepolymer by mixing at room temperature and then cured at temperatures that can be as low as 40°C. 

Figure 3 shows the results of sin investigation of the pH-sensitivity of a crosslinked poly(ortho ester) prepared from 3,9-bis(ethylidene 2,4,8,10-tetraoxaspiro [5,5] undecane), triethylene glycol, and 1,2,6-hexanetriol. In these studies, a marker molecule, p-nitroacetanilide was incorporated into the polymer, and the rate of release of p-nitroacetanilide was assumed to correspond to the rate of erosion of the polymer. This assumption is not entirely accurate because some diffusional release occurs. However, the method is a good measure for determining the changes in erosion rates with changes in external pH. 

Degradation of poly(orthoesters) based on 3,9-bis(ethylidene-2,4,8,10-tetraoxaspiro[5,5] undecane) (DETOSU)... 

Preparation of Poly(4,4 -(l-Phenyl Ethylidene-Bisphenol-4,4 -Di(perfluorobiphenyl)-co-3,5-Dihydroxy-Benzyl Alcohol)... 

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