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Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   2004 , Volume 13 , Number 5; Page(s) 381 To 387.
 
Paper: 

THE EFFECT OF PROCESSING CONDITIONS AND MATRIX TYPE ON THE INTERFACE OF POLYETHYLENE-FIBER/POLYETHYLENE-MATRIX COMPOSITES

 
 
Author(s):  MASOOMI M., GHAFARIAN S.R.*, MOHAMMADI N.
 
* Polymer Engineering Department, Amir Kabir University of Technology, Tehran, I.R. Iran
 
Abstract: 

In this paper three different types of polyethylene, high density (HDPE), medium density (MDPE) and linear low density (LLDPE), have been used to prepare composites with ultra high molecular weight polyethylene (UHMWPE) fibres. Thermal behaviour of the matrices, the fibre and the prepared hot pressed composites were investigated by differential scanning calorimeter (DSC) analysis. PE/PE Microcomposites were prepared from the above materials and their crystalline morphology of the fibre and matrix interfaces were studied by a polarizing microscope. The hot pressed samples and microcomposites were cooled by using different processing conditions, i.e. isothermal crystallization (ISO), air cooling (AC) and ice water quenching (IWQ). The DSC studies revealed that only HDPE had a crystallization condition similar to the melted fibres. The microscopic images showed a big difference between those samples prepared by HDPE matrix that cooled by ISO and IWQ methods. The ISO cooled sample contained a regular transcrystallinity (TC) region having 25μm thickness and consists of compact needle-like crystals set vertically on the fibre surface, while the IWQ cooled sample had a two layer TC region with irregular thickness. In the microcomposites prepared by MDPE and LLDPE as matrix and cooled by ISO method, a sever irregular TC region was appeared and there was no similarity with microcomposites prepared by HDPE as matrix. With regards to the surface melting of fibres, it is probable to consider a three layer region around the fibre core where the crystallization of interface begins from the internal layer, which is UHMWPE melt, and continues through the external layer that is matrix melt. The middle layer seems to be composed of a blend of UHMWPE and PE matrix chains.

 
Keyword(s): POLYETHYLENE COMPOSITE, POLYETHYLENE FIBRE, THERMAL ANALYSIS, INTERFACE
 
References: 
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