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由高度结晶聚酯的非等温超临界二氧化碳发泡制备的组织工程支架。

Scaffold for tissue engineering fabricated by non-isothermal supercritical carbon dioxide foaming of a highly crystalline polyester.

机构信息

Chemistry Department G. Ciamician and INSTM UdR Bologna, University of Bologna, Via Selmi 2, 40126 Bologna, Italy.

出版信息

Acta Biomater. 2010 Jan;6(1):130-6. doi: 10.1016/j.actbio.2009.07.020. Epub 2009 Jul 18.

Abstract

Porous scaffolds of a random co-polymer of omega-pentadecalactone (PDL) and epsilon-caprolactone (CL) (poly(PDL-CL)), synthesized by biocatalysis, were fabricated by supercritical carbon dioxide (scCO(2)) foaming. The co-polymer, containing 31 mol.% CL units, is highly crystalline (T(m) = 82 degrees C, DeltaH(m) = 105 J g(-1)) thanks to the ability of the two monomer units to co-crystallize. The co-polymer can be successfully foamed upon homogeneous absorption of scCO(2) at T > T(m). The effect of soaking time, depressurization rate and cooling rate on scaffold porosity, pore size distribution and pore interconnectivity was investigated by micro X-ray computed tomography. Scaffolds with a porosity in the range 42-76% and an average pore size of 100-375 microm were successfully obtained by adjusting the main foaming parameters. Process conditions in the range investigated did not affect the degree of crystallinity of poly(PDL-CL) scaffolds. A preliminary study of the mechanical properties of the scaffolds revealed that poly(PDL-CL) foams may find application in the regeneration of cartilage tissue.

摘要

采用生物催化法合成了聚(ω-十五内酯(PDL)-ε-己内酯(CL))共聚物(poly(PDL-CL))的多孔支架,该共聚物由超临界二氧化碳(scCO2)发泡而成。由于两种单体单元能够共结晶,共聚物中含有 31mol%的 CL 单元,具有很高的结晶度(T(m)=82°C,ΔH(m)=105J g(-1))。在 T>T(m)时,共聚物能够通过均匀吸收 scCO2 成功发泡。通过微 X 射线计算机断层扫描研究了浸泡时间、降压速率和冷却速率对支架孔隙率、孔径分布和孔连通性的影响。通过调整主要发泡参数,成功获得了孔隙率在 42%-76%范围内、平均孔径为 100-375μm 的支架。在所研究的工艺条件范围内,不会影响聚(PDL-CL)支架的结晶度。对支架机械性能的初步研究表明,聚(PDL-CL)泡沫可能在软骨组织再生中得到应用。

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