High porosity polyethylene aerogels

Document Type: Original research

Authors

Dipartimento di Chimica e Biologia e Unità INSTM, Università degli Studi di Salerno Via Giovanni Paolo II,132- 84084 Fisciano (SA), Italy

Abstract

Monolithic aerogels of high molecular weight polyethylene (Mw= 3x106- 6x106 g/mol) have been prepared by solvent extraction with supercritical carbon dioxide from thermoreversible gels prepared in decalin. These low density and highly porous aerogels present an apparent porosity up to 90%. The aerogel morphology observed by scanning electron microscopy (SEM) is characterized by spherulitic structures being interconnected by fibers. X-ray diffraction experiments show that PE aerogels are highly crystalline with a degree of crystallinity of c.a. 80% and PE chains being packed into the typical orthorombic unit cell. Combined SEM and N2 sorption investigations show that PE aerogels are essentially macroporous with a small amount of mesopores. The oil-sorption performance of polyethylene aerogels has been also evaluated in this study in order to assess a possible use of these materials for oil spillage recovery and results show that aerogel macropores allow a very fast sorption kinetics with a 100% oil weight uptake obtained in less than 1 minute.

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Main Subjects


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Volume 2, Issue 1
Winter and Spring 2015
Pages 49-55
  • Receive Date: 07 November 2014
  • Revise Date: 05 December 2014
  • Accept Date: 09 December 2014