### Modification and characteristics of biodegradable polymer suitable for selective laser sinteringModification and characteristics of biodegradable polymer suitable for selective laser sintering

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 Author Lee, Pil Ho ♦ Chang, Eunyoung ♦ Yu, Seunghye ♦ Lee, Sang Won ♦ Kim, Il Won ♦ Park, Sungjin ♦ Chung, Haseung Source SpringerLink Content type Text Publisher Korean Society for Precision Engineering File Format PDF Copyright Year ©2013 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword Biodegradable polymer ♦ Selective laser sintering (SLS) ♦ Material characteristics ♦ Mechanical properties ♦ Functionally graded material (FGM) ♦ Industrial and Production Engineering ♦ Materials Science 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 CO$_{2}$ laser irradiation with 10.6-ím 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. ISSN 22347593 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2013-06-19 Publisher Place Springer e-ISSN 20054602 Journal International Journal of Precision Engineering and Manufacturing Volume Number 14 Issue Number 6 Page Count 8 Starting Page 1079 Ending Page 1086