Influence of molecular weight average, degree of crystallinity, and viscosity of different polyamide PA12 powder grades on the microstructures of laser sintered part

Wan Yusoff, Wan Ahmad Yusmawiza and Ani, Mohd Hanafi and Pham, DT and Dotchev, K. (2015) Influence of molecular weight average, degree of crystallinity, and viscosity of different polyamide PA12 powder grades on the microstructures of laser sintered part. In: 2015 3rd Asia Conference on Mechanical and Materials Engineering (ACMME 2015), 23rd-24th July 2015, Chengdu, Sichuan, China.

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Abstract

Laser Sintering (LS) allows functional parts to be produced in a wide range of powdered materials using a dedicated machine, and is thus gaining popularity within the field of rapid prototyping. It offers the user the ability to optimise part design in order to meet customer requirements with few manufacturing restrictions. A problem with LS is that sometimes the surface of the parts produced displays a texture similar to that of the skin of an orange (the so­called “orange peel” (texture). The main aim of this research is to develop a methodology of controlling the input material properties of PA12 powder that will ensure consistent and good quality of the fabricated parts. Melt Flow Rate (MFR) and Gel permeation chromatography (GPC) were employed to measure the flow viscosity and molecular weight distributions of Polyamide PA12 powder grades. The experimental results proved that recycle PA12 powder with higher melt viscosity polymer has a higher entanglement with a longer molecule chain causes a higher resistance to flow which cause poor and rough surface finished on laser sintered part

Item Type:	Conference or Workshop Item (Invited Papers)
Additional Information:	3700/50714
Uncontrolled Keywords:	Gel permeation chromatography (GPC); Laser sintering; Melt viscosities; Powdered materials
Subjects:	T Technology > T Technology (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering
Depositing User:	Dr WAN AHMAD YUSMAWIZA WAN YUSOFF
Date Deposited:	20 May 2016 11:02
Last Modified:	04 May 2017 09:55
URI:	http://irep.iium.edu.my/id/eprint/50714

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