On orientation memory in high density polyethylene - Carbon nanofibers composites

Mircea Chipara, Brian Jones, Dorina M. Chipara, Jianhua Li, Karen Lozano, Shah Valloppilly, David Sellmyer

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

An orientation memory effect in high density polyethylene (HDPE) filled with vapor grown carbon nanofibers (VGCNF) is reported. Two-dimensional X-ray (2DXR) confirmed the reorientation of HDPE crystallites upon the uniaxial stretching of HDPE and HDPE filled by VGCNFs. This anisotropy of 2DXR spectra was decreased by heating all stretched samples (loaded or not loaded by VGCNFs) from room to the melting temperature of HDPE. Upon cooling these samples to room temperature, it was noticed that only the nanocomposite retained a weak partial (uniaxial) order, while HDPE showed a completely isotropic 2DXR spectrum. It was concluded that during the stretching of nanocomposites the crystallites and VGCNFs were aligned along the uniaxial stress. Upon heating, the crystalline phase was melted, while the orientation of the VGCNFs was not significantly disturbed. The recrystallization of the polymer started preferentially from the VGCNF - polymer interphase, resulting into an anisotropic crystalline structure.

Original languageEnglish (US)
Pages (from-to)303-310
Number of pages8
JournalE-Polymers
Volume17
Issue number4
DOIs
StatePublished - Jun 27 2017

Keywords

  • memory
  • polyethylene
  • two-dimensional X-ray spectra
  • vapor grown carbon nanofiber

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Polymers and Plastics

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