1989
DOI: 10.1021/ie00094a003
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Development of a reaction injection molding encapsulant system. 1. Kinetic studies of butyllithium-catalyzed styrene polymerization

Abstract: Differential scanning calorimetry (DSC) was used to study the isothermal bulk polymerization of styrene, initiated by either n-butyllithium or 2-butyllithium, over the temperature range 20-50 °C. At higher temperatures, the rates of polymerization initiated with either n-butyllithium and 2butyllithium were the same within experimental error. The polymerization reaction order with respect to initiator and monomer concentrations was found to be 0.5 and 1.0, respectively. The heat of reaction was found to be 16 ±… Show more

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Cited by 6 publications
(11 citation statements)
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“…The initiation and propagation rates have been experimentally verified to be , As in the ideal reaction system, the initiation reaction is sufficiently fast to neglect. The equilibrium reactions, eqs 10 and 13, are also fast.…”
Section: Kinetic Modelmentioning
confidence: 98%
“…The initiation and propagation rates have been experimentally verified to be , As in the ideal reaction system, the initiation reaction is sufficiently fast to neglect. The equilibrium reactions, eqs 10 and 13, are also fast.…”
Section: Kinetic Modelmentioning
confidence: 98%
“…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).…”
Section: Nomenclature Of Groupsmentioning
confidence: 99%
“…Prior to polymerization, oxygen, water, and carbon dioxide were stripped from the monomer by bubbling either argon or oxygen-free nitrogen at 40-80 mL/min through no more than 25 mL of monomer for at least 30 min. Stripping is necessary to prevent preferential reaction of these materials with the BuLi initiator, as detailed in previous studies (Your et al, 1989; Christiansen et al, 1990). Typically, stripping of styrene lowered the active contaminant level to (2-5) X 10-3 M, as determined by titration with BuLi, using an end point defined by the persistence of the orange styryllithium complex (Morton et al, 1970; Worsfold and Bywater, 1972).…”
Section: Materials and Proceduresmentioning
confidence: 99%
“…A thermocouple was placed through the septum and extended into the liquid to measure temperature during the polymerization. Temperature was recorded with the computer-based data acquisition system described previously (Your et al, 1989). At thermal equilibrium, the butyllithium was rapidly injected into the mixture to initiate polymerization.…”
Section: Materials and Proceduresmentioning
confidence: 99%
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