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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   2002 , Volume 11 , Number 6; Page(s) 359 To 364.
 
Paper: 

QUANTITATIVE ORIENTATIONAL CHARACTERIZATION OF LOW-DENSITY POLYETHYLENE BLOWN FILMS BY X-RAY AND BIREFRINGENCE

 
 
Author(s):  TAHERI GHAZVINI N., MOHAMMADI N.*, GHAFFARIAN S.R., ASEM POUR H., HAGHIGHATKISH M.
 
* Polymer Engineering Department, Amir Kabir University of Technology, Tehran, Iran
 
Abstract: 

The effect of two important parameters of film blowing process i.e. take-up ratio and blow-up ratio, on the overall orientation of low density blown films have been investigated using birefringence measurements. Furthermore, by combining X-ray diffraction pole figure analysis and birefringence, the White and Spruiell biaxial orientation functions have been determined for afformentioned sample. Within the range of processing condition studied, increasing take-up ratio, increases orientation in both machine and transverse direction. Upon increasing blow-up ratio, orientation in the transverse direction increases and the overall orientation state approaches to equal biaxial one. Characterization of the crystalline regions by pole figure analysis reveals that a and b crystallographic axes preferentially orientate in the film plane and the direction normal to it, respectively. The amorphous regions do not have any preferential orientation.

 
Keyword(s): POLYETHYLENE, BLOWN FILMS, ORIENTATION, BIREFRINGENCE, X-RAY DIFFRACTION
 
References: 
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