Issue 13, 2016

Correlation of crystal alignment with interphase content in oriented high density polyethylene cast films

Abstract

The microstructure and crystalline morphology of high density polyethylene (HDPE) cast films prepared in a wide range of draw ratios (1.6 to 148.8) were investigated. The flow-induced orientation of crystalline and amorphous phases was characterized using Fourier transform infrared spectroscopy (FTIR). The results showed that the draw ratio has a crucial role on the orientation state of the cast films. Scanning electron microscopy (SEM) images also confirmed this influence. The crystallinity of the films was examined using both differential scanning calorimetry (DSC) and Raman spectroscopy. Moreover, considering a three-phase structure (i.e. crystal, amorphous and interphase) for semi-crystalline polyethylene, Raman spectroscopy was also employed to estimate the amount of the so-called interphase in the HDPE cast films. As a result, the interphase content was found to decrease by increasing the applied draw ratio. The origin of this dependency was suggested to be due to a coil–stretch transition during elongation flow and the subsequent disentanglement. On the other hand, remarkable differences were observed in the CH2 bending vibration features of the Raman spectra of the cast films which were correlated with the applied draw ratios and with the calculated crystalline orientation functions.

Graphical abstract: Correlation of crystal alignment with interphase content in oriented high density polyethylene cast films

Article information

Article type
Paper
Submitted
18 Jan 2016
Accepted
26 Feb 2016
First published
26 Feb 2016

CrystEngComm, 2016,18, 2337-2346

Correlation of crystal alignment with interphase content in oriented high density polyethylene cast films

A. Yadegari, J. Morshedian, H. Khonakdar, U. Wagenknecht, G. Heinrich, M. Malanin, K. Eichhorn and D. Fischer, CrystEngComm, 2016, 18, 2337 DOI: 10.1039/C6CE00129G

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