Feedback

Faculté des Sciences
Faculté des Sciences
MASTER THESIS
VIEW 115 | DOWNLOAD 679

Understanding the effects of carbon and stainless steel fibers on electrical and mechanical properties on selected engineering thermoplastics (PA6 and PBT)

Download
Abdi Alin, Gaël ULiège
Promotor(s) : Jérôme, Christine
Date of defense : 26-Jun-2017 • Permalink : http://hdl.handle.net/2268.2/2490
Details
Title : Understanding the effects of carbon and stainless steel fibers on electrical and mechanical properties on selected engineering thermoplastics (PA6 and PBT)
Translated title : [fr] Étude de l'impact de fibres de carbone et d'acier inoxydable sur les propriétés éléctriques et mécaniques de polymères à base de PA et PBT.
Author : Abdi Alin, Gaël ULiège
Date of defense  : 26-Jun-2017
Advisor(s) : Jérôme, Christine 
Committee's member(s) : Boschini, Frédéric 
Thomassin, Jean-Michel 
Santiague, Pierre 
Language : English
Number of pages : 114
Discipline(s) : Physical, chemical, mathematical & earth Sciences > Chemistry
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en sciences chimiques, à finalité approfondie
Faculty: Master thesis of the Faculté des Sciences

Abstract

[fr] Cabot Corporation supplies a broad range of carbon black based electrically conductive composites (CABELEC®) which are widely used in the automotive, electronics and electrical packaging and equipment industry. Nowadays, the demand in high performance conductive compounds is increasing but carbon black however provides only moderate reinforcements in mechanical properties. Within this framework, the purpose of this project was to provide a comprehensive understanding of the effects of carbon fiber (PAN and PITCH) and stainless steel fibers toward performances of polyamide 6 based composite. In this work, composites were compounded by twin screw extrusion. Since fibers aspect ratio is of crucial importance to manufacture good performance composite, the first part of this project was dedicated to the evaluation and optimization of compounding settings in order to maximize fibers aspect ratio. Increasing screw speed and filler loading enhanced fibers degradation whereas higher output rate and temperature displayed significant impact on preserving fibers. In the second part, the effects of selected fillers toward electrical (i.e. volume resistivity) and mechanical (strength, stiffness and toughness) properties were thoroughly investigated. Carbon fiber PAN, owing its lower degradation during compounding and better adhesion to the polymeric matrix used, appears to be the more efficient in providing conductivity (i.e. volume resistivity of 10 Ohm.cm and percolation at 3.4% vol.) and reinforcements. In the last part, hybrids (i.e. containing at least two different fillers) were investigated. The first hybrid, containing stainless steel and carbon PAN fibers, displayed synergistic effects toward electrical properties and good mechanical performance although mechanical enhancement was lower than expected assumedly due to higher shear during compounding by fiber-fiber interactions. Lastly, hybrid containing mostly carbon black and small amount of carbon PAN fibers (i.e. 2% wt.) was investigated. Carbon fibers in such hybrids provided enhanced electrical properties and effective reinforcement in term of strength (+15%) and stiffness (+20%).


File(s)

Document(s)

File
Access thesis final matheo.pdf
Description:
Size: 7.17 MB
Format: Adobe PDF

Author

  • Abdi Alin, Gaël ULiège Université de Liège > Master en sc. chimiques, à fin.

Promotor(s)

Committee's member(s)

  • Boschini, Frédéric
  • Thomassin, Jean-Michel
  • Santiague, Pierre
  • Total number of views 115
  • Total number of downloads 679










All documents available on MatheO are protected by copyright and subject to the usual rules for fair use.
The University of Liège does not guarantee the scientific quality of these students' works or the accuracy of all the information they contain.