Chiang Mai Journal of Science

Preparation and Characterization of 3D Printed Porous Polyethylene for Medical Applications by Novel Wet Salt Bed Technique

Paper Type	Contributed Paper
Title	Preparation and Characterization of 3D Printed Porous Polyethylene for Medical Applications by Novel Wet Salt Bed Technique
Author	Jintamai Suwanprateeb*, Faungchat Thammarakcharoen and Waraporn Suvannapruk
Email	jintamai@mtec.or.th
Abstract:  In this study, an influence of using traditionally dry and newly developed wet sodium chloride salt bed to support the three dimensional printed polyethylene specimens during heat treatment step on obtained porous structure and properties was investigated.  It was found that the use of wet salt bed could retain greater level of porosity and pore size in heat treated polyethylene than using dry salt bed compared to the as-printed sample.  The thermal shrinkage in all directions of wet supported bed specimens was observed to be less, but more uniform.  Tensile modulus and strength of wet bed specimens were lower as a result of the increase in porosity, but strain at break was inversely greater.   This was due to the formation of temporary salt mould-like structure surrounding the specimens during thermal treatment which caused the restraint effect on the molten polyethylene movement and obstructed the densification process resulting in retained porous structure of the wet bed samples.  In contrast, molten polyethylene could freely move in the loose dry powder bed leading to the greater degree of structural densification.
Start & End Page	200 - 212
Received Date	2012-09-18
Revised Date
Accepted Date	2013-02-21
Full Text	Download
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Volume	Vol.41 No.1 (JANUARY 2014)
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