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Vinyl ethers, “cation pool polymerization initiator

Yoshida and coworkers also developed a microreaction system for cation pool-initiated polymerization [62]. Significant control of the molecular weight distribution (Mw/Mn) was achieved when N-acyliminium ion-initiated polymerization of butyl vinyl ether was carried out in a microflow system (an IMM micromixer and a microtube reactor). Initiator and monomer were mixed using a micromixer, which was connected to a microtube reactor for the propagation step. The polymerization reaction was quenched by an amine in a second micromixer. The tighter molecular weight distribution (Mw/M = 1.14) in the microflow system compared with that of the batch system (Mw/M > 2) was attributed to the very rapid mixing and precise control of the polymerization temperature in the microflow system. [Pg.79]

Cation-pool Initiated Polymerization of Vinyl Ethers Using a Microflow System ... [Pg.182]

The requirement of extremely fast initiation can be met by the use of a highly reactive cation pool as an initiator, which we have already discussed in the previous chapters. In fact, the use of the less sterically demanding, highly reactive N-acyliminium ion shown in Scheme 9.9 is quite effective for polymerization of vinyl ethers. [Pg.182]

Scheme 9.9 Cation-pool initiated polymerization of vinyl ethers... Scheme 9.9 Cation-pool initiated polymerization of vinyl ethers...
Fig. 5 Flow microreactor system for polymerization of vinyl ether initiated by Af-acyliminium ion (cation pool). Ml, M2 micromixers Rl, R2 microtube reactors... Fig. 5 Flow microreactor system for polymerization of vinyl ether initiated by Af-acyliminium ion (cation pool). Ml, M2 micromixers Rl, R2 microtube reactors...
Scheme 14.6 Cationic polymerization of vinyl ethers initiated by N-acyliminium ion pool. Scheme 14.6 Cationic polymerization of vinyl ethers initiated by N-acyliminium ion pool.
The present cation pool-initiated polymerization using a microflow system can be applied to other vinyl ethers such as isobutyl vinyl ether (IBVE) and tert-butyl vinyl ether (TBVE) (Table 14.2). The corresponding macroscale batch polymerization results in much poorer molecular weight distribution control. [Pg.746]

Polymerization of vinyl ethers initiated by an A -acyUminium ion pool has demonstrated that the molecular weight and the molecular weight distribution can be controlled by using the flow microreactor system (Fig. 10.5) [4, 5]. An iV-acyh-minium ion generated and accumulated by the cation pool method was used as an initiator, which was mixed with a vinyl ether at high speed using a micromixer. The polymerization proceeded in a flow microreactor and was complete within a short residence time. An amine was then introduced using a micromixer to terminate the polymerization. Thus, this polymerization can be called flash polymerization. [Pg.91]


See other pages where Vinyl ethers, “cation pool polymerization initiator is mentioned: [Pg.207]    [Pg.194]    [Pg.94]   
See also in sourсe #XX -- [ Pg.194 ]

See also in sourсe #XX -- [ Pg.194 ]




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Cation initiating

Cation pool

Cation-pool Initiated Polymerization of Vinyl Ethers Using a Microflow System

Cationic initiation

Cationic initiators

Cationic initiators vinyl ether polymerization

Cationic polymerization

Cationic polymerization ethers

Cationic polymerization initiation

Cationic polymerization polymerizations

Cationic polymerization vinyl ethers

Cationic vinyl ether

Cationic-initiated polymerization

Initiator cationic polymerization

Initiator polymeric

Polymerization vinylic

Polymerization, “cation pool

Polymerization, “cation pool initiator

Vinyl cations

Vinyl ether cations

Vinyl ethers, polymerization

Vinyl ethers, “cation pool

Vinyl polymerization

Vinylic cations

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