No abstract

Summary: The application of the terminal copolymerization model to polar modified anionic initiated 1,3‐butadiene/styrene systems in hydrocarbon solvent requires the determination of twelve kinetic model parameters. These include frequency factors (kxY,∞), activation energies (ExY) and live chain end association numbers (nxY) for all four possible combinations of live chain end termini and free monomer. The individual determination of all twelve parameters requires an enormous numerical effort and a large number of experiments. A method for estimating parameters with a minimum number of kinetic batch experiments in an industrial environment will be demonstrated.

DDR -4200 MerseburgEine Apparatur zur Flussig-Gas-Chromatographie mit Polymeren als stationare Phase wird hesrhriehen. Die spezifischen Retentionsvolumina einiger Losungsmittel in Polyglykolen mit verschiedenen Molmassen werden vorgelegt. Ein Teil dieser MeDwerte dient zur Berechnung der (segmentmolaren) Aktivitatskoeffizienten bei unendlicher Verdunnung. Die Ergebnisse werden diskutiert und mit nach der UNIFAC-Methode berechneten Werten verglichen. TepMoaunaMuuecme uccneaoeafiua pacmeopoe nosu&epoe c noAoqbm za303tt~axocm~oii xpoaamozpa@uuOnMCbIBaeTCH YCTPOfiCTBO AJIR n p O B e A e H H R I'a30HCHRKOCTHOm XpOMaTOrpa@HH C HCnOJIb3OBaHHeM IIOJIHMepOB B K a q e C T B e HeIIORBHHCHOfi @a3bI. C o o 6~a m r c~ 3Ha'leHHR YAeJIbHOrO y A e p m H B a e M o r 0 06.6e~a EJIR HeKOTOPbIX PaCTBOp M T e n e f i B IIOJIMPJIHKOJIFIX p a x J I H 9 H b I X MOJIeKyjIHpHbIX MaCC. Y a C T b 3TMX 3KCnePHMeHTaJIbHbIX 3 H a q e H H f i HCIlOJI3J'eTCR RJIFI BbIWiCJIeHMR (CeI'MeHTMOJIRPHbIX) KO3@@HIpXeHTOB aKTHBHOCTH IIpH 6eCKOHeqHOM p a 3 6 a B n e H H H . n O J I y 9 e H H b I e p e 3 y J I b T a T b I o 6 c y m g a m~c~ M CpaBHHBaIOTCR CO 3HaYeHHRMH, BbI9HCJIeHHHMH MeTOAOM YHkfmAK. Thermodynamic investigations of polymer solutions by gas-liquid chromatographyAn apparatus for gas-liquid chromatography with polymers as a stationary phase is described. Specific retention volumina of some low molecular solvents in poly(ethyleneglyco1)s differing in molecular mass are presented. Some of these experimental results serve to calculate (segmentmolar) activity coeffirients a t infinite dilution, which are discussed and compared with values, calculated by the UNIFAC-me thod.

The effect of curing additives on the dispersion kinetics of carbon black (CB) in styrene butadiene rubber (SBR) compounds was investigated by means of the method of the online measured electrical conductance. Addition of curing additives such as stearic acid and diphenylguanidine (DPG) accelerates the CB dispersion process significantly. The viscosity of the rubber matrix was not changed after their addition. The addition of stearic acid and DPG may alter the filler–filler interaction that consequently leads to faster dispersion processes. The obtained difference in morphologies of SBR mixtures containing stearic acid and DPG, respectively, are caused by their different infiltration behavior, which may lead to different dispersion mechanisms. Addition of ZnO could not improve the dispersion process of CB because of its limited interaction with CB. Sulfur and N-cyclohexylbenzothiazole-2-sulfenamide decelerate the CB dispersion process. The strong effect of the rubber microstructure such as styrene content and molecular weight on the CB dispersion in SBR mixtures without additives was found and discussed by taking into consideration the known dispersion mechanisms. The influence of addition of curing additives on the CB dispersion in low styrene-content SBR mixtures is much more pronounced than that in high styrene-content SBR mixtures.