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Polymerizations, cationic diisopropenylbenzenes

Fig. 8 Flow microreactor system for cationic polymerization of 1,4-diisopropenylbenzene initiated by TfOH. M T-shaped micromixer, /f microtube reactor... Fig. 8 Flow microreactor system for cationic polymerization of 1,4-diisopropenylbenzene initiated by TfOH. M T-shaped micromixer, /f microtube reactor...
Cationic Polymerization of Diisopropenylbenzenes Using Flow Microreactor Systems... [Pg.12]

The cationic polymerization of p-diisopropenylbenzene (DIPB) has been studied by Brunner et al. [305] and independently at the same time by Mitin and Glukhov [306]. Under conditions that favor dimerization of (ot-methylstyrene, Brunner et al. [305] could prepare soluble polymers, which contained predominantly polyindane structures, with catalysts such as BF3, SnCU, H2SO4, and H3PO4. They visualized the polymerization proceeding according to the following scheme ... [Pg.119]

Nuyken et al. [309] took a closer look at the many different structures which may result by cationic polymerization of diisopropenylbenzene. This lead to a strategy to produce telechelic poly(indane)s. [Pg.120]

The core first method starts from multifunctional initiators and simultaneously grows all the polymer arms from the central core. The method is not useful in the preparation of model star polymers by anionic polymerization. This is due to the difficulties in preparing pure multifunctional organometallic compounds and because of their limited solubility. Nevertheless, considerable effort has been expended in the preparation of controlled divinyl- and diisopropenylbenzene living cores for anionic initiation. The core first method has recently been used successfully in both cationic and living radical polymerization reactions. Also, multiple initiation sites can be easily created along linear and branched polymers, where site isolation avoids many problems. [Pg.76]

The proposed mechanism was identical with that in acid-catalyzed reactions except for the initiation step. Photolysis of the iodonium salt yields cations and cation radicals that react with traces of water or the monomer to form HX [23]. The Bronsted acid HX then functions similarly to other Bronsted acids in the polymerization reactions. 1,3-Diisopropenylbenzene has also been polymerized in a photoinitiated cationic reaction using 70 as the initiator [Eq. (14)] [9]. [Pg.569]


See other pages where Polymerizations, cationic diisopropenylbenzenes is mentioned: [Pg.152]    [Pg.12]   
See also in sourсe #XX -- [ Pg.12 ]




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