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Modification and Characteristics of Biodegradable Polymer Suitable for Selective Laser Sintering

Authors
Lee, Pil-HoChang, EunyoungYu, SeunghyeLee, Sang WonKim, Il WonPark, SungjinChung, Haseung
Issue Date
Jun-2013
Publisher
KOREAN SOC PRECISION ENG
Keywords
Biodegradable polymer; Selective laser sintering (SLS); Material characteristics; Mechanical properties; Functionally graded material (FGM)
Citation
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING, v.14, no.6, pp.1079 - 1086
Journal Title
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
Volume
14
Number
6
Start Page
1079
End Page
1086
URI
https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/17116
DOI
10.1007/s12541-013-0145-4
ISSN
2234-7593
Abstract
This paper investigates the methodology to modify biodegradable polymers having random size, shape, and molecular weight into particles appropriate for selective laser sintering (SLS), which is a powerful technique to build arbitrarily complex objects. Polycaprolactone (PCL), which has recently drawn significant attention as biodegradable polymer for potential application in bone and cartilage repair, was used in this study PCL powders with various sizes, shapes, and molecular weights were modified by chemical processes and resultant shape, size distribution, degree of crystallinity, and thermophysical properties were observed by optical and scanning electron microscopy (OM and SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSc). The modified PCL as well as raw material were sintered by CO2 laser irradiation with 10.6-im wavelength, and specimens for tensile testing were fabricated. By simple design of experiment (DOE) method, macro and micro structures of the fabricated parts were observed depending on various processing parameters related with SLS. Finally, micro tensile tests were conducted, and tensile properties as a function of molecular weight and particle shape were obtained. All the procedures attempted in this study can be extensively applied to other biodegradable polymers. Since SLS has an advantage to deposit multiple materials spatially, the obtained mechanical properties can be referred to generate functionally graded material (FGM), which incorporates deliberately designed transition in materials composition and properties within a component, by SLS.
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