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Effect of Sorbitol Templates on the Preferential Crystallographic Growth of Isotactic Polypropylene Wax

Innovación y Desarrollo en Materiales Avanzados A. C., Grupo POLYnnova, Carr. San Luis Potosí-Guadalajara 1510, Nivel 3, Local 12, Lomas del Tecnológico, San Luis Potosí 78211, Mexico
Centro de Investigación en Química Aplicada, Blvd. Ing. Enrique Reyna H. 140, Col. San José de los Cerritos, Saltillo, Coahuila 25294, Mexico
Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
Authors to whom correspondence should be addressed.
Crystals 2018, 8(2), 59;
Received: 19 November 2017 / Revised: 11 January 2018 / Accepted: 22 January 2018 / Published: 26 January 2018
(This article belongs to the Special Issue Crystal Structure Analysis of Supramolecular and Porous Solids)
PDF [3018 KB, uploaded 26 January 2018]


The crystallization of isotactic polypropylene wax (iPP) in the presence of different sorbitol structures was studied. Dibenzylidene Sorbitol (DBS), as well as two of its derivatives with one or two methyl groups in the DBS molecule (MDBS and DMDBS, respectively), were tested as nanometer-size fibrillar templates. The early nucleation stage and crystal morphology were analyzed in Real-Time Wide-Angle X-ray Scattering (WAXS) and polarized optical microscopy (POM). It was found that the iPP crystals showed an α-phase unit cell for the three different sorbitols. However, a preferential crystal growth in the plane (040) was observed for iPP–MDBS. The macrostructure morphology of the iPP–DBS and iPP–DMDBS wax compounds was spherulitic, while nodular macrocrystals were observed for the iPP–MDBS compound. It was concluded that the MDBS template promoted a lower interface energy because of its match with the c-axis of the iPP wax crystals, whereas, in the case of the DBS and DMDBS templates, the preferential plane was the (110), characteristic of the iPP spherulitic arrangement. View Full-Text
Keywords: template; crystal growth; sorbitol; isotactic polypropylene wax; preferential arrangement template; crystal growth; sorbitol; isotactic polypropylene wax; preferential arrangement

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Quiñones-Jurado, Z.V.; Ávila-Orta, C.A.; Castillo-Reyes, B.E.; Mata-Padilla, J.M.; Hsiao, B.S.; Medellín-Rodríguez, F.J.; Waldo-Mendoza, M.A. Effect of Sorbitol Templates on the Preferential Crystallographic Growth of Isotactic Polypropylene Wax. Crystals 2018, 8, 59.

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