Fabrication of biodegradable polyurethane microspheres
碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 101 === Two types of waterborne biodegradable polyurethane (WBDPU) in the form of homogeneous nanoparticles (NPs) were synthesized using biodegradable polyesters as soft segment. The first WBDPU (PU01) was based on polycaprolactone diol (PCL diol, Mw 2000) and the...
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ndltd-TW-101NTU053100162015-10-13T23:05:29Z http://ndltd.ncl.edu.tw/handle/63020048061965993170 Fabrication of biodegradable polyurethane microspheres 可降解聚胺酯微球之製備 Cheng-Yen Lin 林政諺 碩士 國立臺灣大學 高分子科學與工程學研究所 101 Two types of waterborne biodegradable polyurethane (WBDPU) in the form of homogeneous nanoparticles (NPs) were synthesized using biodegradable polyesters as soft segment. The first WBDPU (PU01) was based on polycaprolactone diol (PCL diol, Mw 2000) and the second WBDPU (PU02) was based on 40% PCL diol and 60% polyethylene butylene adipate diol (PEB diol, Mw 2000). The dispersion of WBDPU NPs were prepared in different solid contents, sprayed into liquid nitrogen, and resuspended in water. During the process, the NPs were self-assembled into microspheres, with an average size of 50-60 um. By adjusting the contents of NPs, microspheres could be obtained with different porosity. In vitro degradation results revealed that microspheres from PU02 (i.e. PU02 MS) has faster degradation rate than those from PU01 (PU01 MS). The release of methylene blue encapsulated during MS formation was investigated. PU02 MS made from 10% dispersion (i.e. PU02 MS_10) showed a greater burst release at 6 hours, whereas PU01 MS_30 had significantly lower burst release. Biocompatibility evaluation using L929 fibroblasts demonstrated that cells could attach on the microspheres after 24 hours. On the other hand, the microspheres may self-assemble further into films and scaffolds. The mechanical properties of self-assembled solid films from microspheres were similar to those from NP dispersion. Surface modification of microspheres by low molecular weight positively charged chitosan may modify the self-assembly behavior of microspheres. Scaffolds made of microspheres may have different porous structure by controlling the amount of microspheres that built up the scaffolds. Fibroblasts were successfully seeded and grown in the scaffolds. We concluded that the biodegradable and elastic microspheres with potential applications in drug release and cell carriers may be facilely produced from a green and sustainable process. Shan-hui Hsu 徐善慧 2013 學位論文 ; thesis 70 zh-TW |
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碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 101 === Two types of waterborne biodegradable polyurethane (WBDPU) in the form of homogeneous nanoparticles (NPs) were synthesized using biodegradable polyesters as soft segment. The first WBDPU (PU01) was based on polycaprolactone diol (PCL diol, Mw 2000) and the second WBDPU (PU02) was based on 40% PCL diol and 60% polyethylene butylene adipate diol (PEB diol, Mw 2000). The dispersion of WBDPU NPs were prepared in different solid contents, sprayed into liquid nitrogen, and resuspended in water. During the process, the NPs were self-assembled into microspheres, with an average size of 50-60 um. By adjusting the contents of NPs, microspheres could be obtained with different porosity. In vitro degradation results revealed that microspheres from PU02 (i.e. PU02 MS) has faster degradation rate than those from PU01 (PU01 MS). The release of methylene blue encapsulated during MS formation was investigated. PU02 MS made from 10% dispersion (i.e. PU02 MS_10) showed a greater burst release at 6 hours, whereas PU01 MS_30 had significantly lower burst release. Biocompatibility evaluation using L929 fibroblasts demonstrated that cells could attach on the microspheres after 24 hours. On the other hand, the microspheres may self-assemble further into films and scaffolds. The mechanical properties of self-assembled solid films from microspheres were similar to those from NP dispersion. Surface modification of microspheres by low molecular weight positively charged chitosan may modify the self-assembly behavior of microspheres. Scaffolds made of microspheres may have different porous structure by controlling the amount of microspheres that built up the scaffolds. Fibroblasts were successfully seeded and grown in the scaffolds. We concluded that the biodegradable and elastic microspheres with potential applications in drug release and cell carriers may be facilely produced from a green and sustainable process.
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author2 |
Shan-hui Hsu |
author_facet |
Shan-hui Hsu Cheng-Yen Lin 林政諺 |
author |
Cheng-Yen Lin 林政諺 |
spellingShingle |
Cheng-Yen Lin 林政諺 Fabrication of biodegradable polyurethane microspheres |
author_sort |
Cheng-Yen Lin |
title |
Fabrication of biodegradable polyurethane microspheres |
title_short |
Fabrication of biodegradable polyurethane microspheres |
title_full |
Fabrication of biodegradable polyurethane microspheres |
title_fullStr |
Fabrication of biodegradable polyurethane microspheres |
title_full_unstemmed |
Fabrication of biodegradable polyurethane microspheres |
title_sort |
fabrication of biodegradable polyurethane microspheres |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/63020048061965993170 |
work_keys_str_mv |
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