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Novel Functional PolymersRadical PolymerizationCarbocationic PolymerizationNovel Topology PolymersPVC DegradationAmphiphilic Conetworks

Polymer Chemistry Research Group


Quasiliving Carbocationic Polymerization


Quasiliving carbocationic polymerization is a recent polymerization technique especially apt for producing polymers of exceptionally narrow molecular weight distribution and precisely defined structure.

Our object is to develop and optimize novel polymerization systems which maximize the capabilities of this technique, resulting in unprecedented accuracy in molecular weight distribution and polymer structure.


Our investigations target the effect of solvents, temperature, initiators, Lewis-acid coinitiators and nucleophilic additives on the polymerization. The monomers studied are isobutylene, styrene and derivatives thereof. Our major results include:



Élö karbokation

A living carbocation-ended polyisobutylene chain complexed with a transition metal gegenion


- Performing the quasiliving carbocationic polymerization of isobutylene in the presence of chelating compounds, a new class of nucleophilic additives, resulting in polyisobutlyene oligomers with ultra narrow molecular weight distribution (see figure to left).

- Revealing the relationship between the molecular structure of the nucleophilic additive and its effect on the carbocationic polymerization of isobutylene.

- Through the use of several solvents in the polymerization of isobutylene a strong solvent effect was demonstrated, influenced by the chemical structure of the solvent as well as its polarity.

- With benzotrifluoride as reaction medium it is possible to synthesize well-defined polyisobutylenes at elevated temperatures (-20...0°C).

Gel permeation chromatograms for the demonstration of the effect of a N-containing chelating nucleophile (TMEDA, yellow line) on polydispersity

For comparison, the case of using a conventional nucleophile (DMPy, blue line) and that of additive-free polymerization (white line) are also presented.

- Analysis of slow initiation in the case of a new initiator in the carbocationic polymerization of isobutylene.

- New functionalizing reactions in isobutlyene and styrene polymerizations, modification of the functional groups.

- Synthesis of well-defined poly(isobutylene-b-styrene) block copolymers by carbocationic polyme-rization on the basis of kinetic investigations.


 Béla IvánGyörgy KaszaÁkos SzabóKlára Verebélyi