Development of a reaction injection molding encapsulant system. 3. Gel times for the anionic bulk polymerization of styrene with divinylbenzene

An improved general kinetic analysis of non-linear irreversible polymerisations

“…Karles et al (1991) have found that m P =1.2±0.8 for bulk polymerisation of DVB, different from styrene, which is a source of some complications in kinetic modelling. Notice that no mixed association of anions coming from initiator and from polymer would be allowed using this simplified model (which does not allow either for dependence of m P on the nature of terminal unit).…”

“…After a few fundamental studies on its chemical kinetics (Worsfold, 1970;Eschwey and Burchard, 1975) have been carried out, this system was later found to be useful as a model for RIM encapsulation of electronic parts (Your et al, 1989;Christiansen et al, 1990;Karles et al, 1991).…”

“…For p-divinylbenzene, kinetic measurements (Worsfold, 1970;Karles et al, 1991) show that the pending vinyl group is about 10 times less reactive than the initial one, and about as reactive as the vinyl groups in styrene and mdivinylbenzene. On the contrary, anion reactivities look more or less similar.…”

Síntese de copolímeros de estireno-divinilbenzeno por polimerização radicalar convencional e mediada por nitróxido: experimentos e modelagem matemática.

“…An example is n-butyllithium initiated bulk polymerisation of styrene in benzene, for which m I = 6 (Worsfold and Bywater, 1960), and m P = 2. Karles et al (1991) have found that m P =1.2±0.8 for bulk polymerisation of DVB, different from styrene, which is a source of some complications in kinetic modelling. Notice that no mixed association of anions coming from initiator and from polymer would be allowed using this simplified model (which does not allow either for dependence of m P on the nature of terminal unit).…”