A Facile Method for Preparation of Polymer Particles Having a "Cylindrical" Shape. Issue 31 (29th June 2018)

• Record Type: Journal Article
• Authors: Li, Wei; Suzuki, Toyoko; Minami, Hideto
• Is Part Of: Angewandte Chemie international edition. Volume 57:Issue 31(2018)
• Page Start: 9936
• Page End: 9940
• Publication Date: 2018-06-29
• Subjects: cylindrical particles -- Pickering emulsion -- polymers -- polystyrene -- stirring method; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201805700
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A facile and novel approach to prepare monodisperse polystyrene (PS) particles having a "cylindrical" shape was discovered. Spherical PS particles prepared by dispersion polymerization were stirred in a polyvinylpyrrolidone (PVP) aqueous solution for several hours using a magnetic stirrer at room temperature. In the presence of PVP, the spherical PS particles deformed into cylindrical shapes following stirring; however, the particles did not deform in the absence of PVP. The deformation rate of the particles was affected by the molecular weight of the dissolved PVP. This stirring method is not only highly efficient and high yielding, but also applicable to other materials such as polymethyl methacrylate. Moreover, the cylindrical particles were successfully applied as particulate surfactants in a Pickering emulsion system, which exhibited excellent stability in comparison to a system using spherical particles as a surfactant. In the first case, the emulsion was left standing for more than 4 months. Abstract : Changing shape : When spherical polystyrene particles prepared via dispersion polymerization were introduced to a polyvinylpyrrolidone (PVP) aqueous solution and simply stirred using a magnetic stirrer, they were transformed into cylindrical particles. This stirring method was also applicable to other materials and various particle sizes. Scale up should be possible.