Preparation, stabilization, and characterization of polyisobutylene aqueous suspension
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Preparation, stabilization, and characterization of polyisobutylene aqueous suspension Zahra Dastbaz 1 & Seyed Nezameddin Ashrafizadeh 1 Received: 13 April 2020 / Revised: 7 August 2020 / Accepted: 12 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Aqueous suspension of polyisobutylene (PIB) was stabilized via application of anionic surfactant of sodium lauryl sulfate (SLS) and co-surfactants of stearyl and cetyl alcohols. Suspensions were produced via the so-called direct emulsification technique. Some characterization tests including zeta potential, particle size, turbidity, conductivity, and rheology measurements were demonstrated to analyze the stability of produced suspensions. Turbidity and particle size measurements showed that just some of the samples were stable while the others exhibited partial aggregation of particles. The characterization tests showed that the sample contained 2 g of polyisobutylene, 0.45 g SLS, 0.175 g stearyl, and 0.263 g cetyl alcohols, i.e., co-surfactant ratio of 0.66, in 80 mL of water exhibited appropriate stability. Possession of high zeta potential of − 93.65 mV, conductivity of 570 mS/cm, an average particle size of 10 μm, and good rheological behavior besides the stable appearance revealed that this sample did not undergo agglomeration, flocculation, or any phase separation. Keywords Polymeric suspension . Polyisobutylene . Stability of suspension . Rheology . SLS
Introduction Suspensions, or dispersions of particles in the liquid phase, have been used in a large number of industries including foodstuff, ink, ceramic, drilling, and pipeline oil transportation [1]. Among these, one of the most exciting applications is the use of polymeric suspensions in the pipeline transportation of crude oil. For such an application, it is necessary to have a stable and relatively mono-dispersed dispersion of polymer particles in the aqueous phase [2]. The process of suspending polymers is often carried out using a blend of polymer species with ionic and/or non-ionic surfactants as well as other dispersant additives. Surfactants lead in decreasing surface tension and make suspensions stable. However, sometimes surfactants alone cannot create the proper interfacial tension, so by using a mixture of surfactants one can achieve the required
* Zahra Dastbaz [email protected] * Seyed Nezameddin Ashrafizadeh [email protected] 1
Research Lab for Advanced Separation Processes, Department of Chemical Engineering, Iran University of Science and Technology, Narmak, Tehran 16846-13114, Iran
interfacial tension [3]. The blend systems have rheological and interfacial characteristics which can be quite different from those of individual polymer or surfactant species [4]. Polyisobutylene (PIB) is a commercially available polymer used in a large number of applications due to its thermal stability, good flexibility at ambient temperature, and capability of passing gases. Although PIB has distinctive properties which distinguish it from other po
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