naa a22 4500 510822231 CHVBK 20180411083539.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12541-013-0145-4 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0145-4 Modification and characteristics of biodegradable polymer suitable for selective laser sintering [Elektronische Daten] [Pil-Ho Lee, Eunyoung Chang, Seunghye Yu, Sang Lee, Il Kim, Sungjin Park, Haseung Chung] 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-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. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 Biodegradable polymer nationallicence Selective laser sintering (SLS) nationallicence Material characteristics nationallicence Mechanical properties nationallicence Functionally graded material (FGM) nationallicence MW : molecular weight nationallicence γ ∞ : surface tension in molecular weight of infinity nationallicence γ : surface tension in molecular weight of M nationallicence Lee Pil-Ho School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, 440-746, Gyeonggi, South Korea aut Chang Eunyoung Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut Yu Seunghye Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, 156-743, Seoul, South Korea aut Lee Sang School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, 440-746, Gyeonggi, South Korea aut Kim Il Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, 156-743, Seoul, South Korea aut Park Sungjin Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut Chung Haseung Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 1079-1086 2234-7593 14:6<1079 2013 14 12541 https://doi.org/10.1007/s12541-013-0145-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0145-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Pil-Ho School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, 440-746, Gyeonggi, South Korea aut NATIONALLICENCE 700 1- Chang Eunyoung Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut NATIONALLICENCE 700 1- Yu Seunghye Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, 156-743, Seoul, South Korea aut NATIONALLICENCE 700 1- Lee Sang School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, 440-746, Gyeonggi, South Korea aut NATIONALLICENCE 700 1- Kim Il Department of Chemical Engineering, Soongsil University, 369 Sangdo-ro, Dongjak-gu, 156-743, Seoul, South Korea aut NATIONALLICENCE 700 1- Park Sungjin Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut NATIONALLICENCE 700 1- Chung Haseung Department of Mechanical and System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, 121-791, Seoul, South Korea aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 1079-1086 2234-7593 14:6<1079 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer