Poly-p-methoxystyrene

For the polymerisation of styrene (SnC -F O-PhNC -CC at 0°) kjkv for anisole was found [85] to be 1.62. It is highly probable that the big difference between this and the value for isobutene reflects mainly the difference between the ps for the two monomers. The very low value of kjkv in the polymerisation of isobutene - or the very large kv of isobutene - accounts for the observation [86] that, whereas styrene polymerising cationically in the presence of preformed poly-p-methoxystyrene will form grafts by reacting with pendent rings, isobutene will not do so. 

Graft copolymers of nylon, protein, cellulose, starch, copolymers, or vinyl alcohol have been prepared by the reaction of ethylene oxide with these polymers. Graft copolymers are also produced when styrene is polymerized by Lewis acids in the presence of poly-p-methoxystyrene. The Merrifield synthesis of polypeptides is also based on graft copolymers formed from chloromethaylated PS. Thus, the variety of graft copolymers is great. 

PPG PPGDE PPMA PpMOS PpMS polylpropylene glycol) polylpropylene glycol dimethyl ether) polyin-propyl methacrylate) poly(p-methoxystyrene) poly(p-methylstyrene)... 

Hydride transfer is especially favorable when it generates tertiary carbenium ions which are stabilized by phenyl, alkoxy, and/or vinyl groups. Degradation of poly(p-methoxystyrene) in the presence of acid indicates that hydride transfer occurs in p-methoxystyrene polymerizations [Eq. (98)] [29], Monomeric and oligomeric carbenium ions derived from a-methyl-p-methoxystyrene were detected by both NMR and UV, which indicates that hydride transfer at the chain end generates a tertiary carbenium ion which subsequently depropagates according to Eq. (98). 

Boron trifluoride-diethyl ether complex is a very versatile and useful Lewis acid in several organic reactions. The polymeric ether-BFs complex poly(p-methoxystyrene)-BF3 (14) has been prepared and is more stable and has higher activity in several organic reactions such as isomerization and epoxide rearrangement [26]. The polymeric version of pyridine-BF3 complex 15 has also been prepared from poly(vinylpyridine) and BF3 [27]. By analogy with the polystyrene-AlCls complex, simple crosslinked polystyrene also forms a stable complex in chloroform with boron trifluoride 16 [27]. 

Cationic polymerization allows the formation of poly-p-methoxystyrene particles. ... 

An example of the first technique is provided by the polymerization of isobutyl vinyl ether (IBVE) on poly(p-methoxystyrene) (p-MOS). Iodine-initiated polymerizations of p-MOS at —15 conducted in solvents of low polarity or in the presence of excess common anions produce non-dissociated active centres that can... 

Poly(isobutyl vinyl elher)-block-poly(p-methoxystyrene) Chromatography Butanone SEC 1297... 

Poly(p-methoxystyrene)-Wocit-poly(cyclohexene oxide)... 

Poly(4-methoxystyrene) Poly(p-methoxystyrene) 24936-44-5 Benzene, l-ethenyl-4-methoxy-. R (C,H oO)a... 

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