Controllable fabrication of porous PLGA/PCL bilayer membrane for GTR using supercritical carbon dioxide foaming

Controllable fabrication of porous PLGA/PCL bilayer membrane for GTR using supercritical carbon dioxide foaming
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利用超临界二氧化碳发泡可控制备 GTR 多孔 PLGA/PCL 双层膜

DOI:
10.1016/j.apsusc.2018.04.059
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发表时间:
2019-04
影响因子:
6.7
通讯作者:
Cen Lian
Cen Lian
中科院分区:
材料科学1区
文献类型:
--
作者:
Song Chaobo;Li Shuang;Zhang Jiapeng;Xi Zhenhao;Lu Eryi;Zhao Ling;Cen Lian

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本研究开发了一种高效的无溶剂发泡方法,在超临界二氧化碳(sc-CO2)的辅助下制备多孔PLGA/PCL双层膜,用于潜在的引导组织再生(GTR)应用。首先对PLGA和PCL的流变特性和发泡行为进行了详细的研究。与PLGA相比,PCL具有较低的粘度和损失tan δ / 1,因此发泡后孔隙较大且连通程度较高。在此基础上,通过一步发泡法制备了具有不同多孔性的PCL和PLGA双分子层膜。SEM结果表明,PCL层的孔径为80 ~ 100 μm, PLGA层的孔径小于10 μm。拉伸试验表明,拉伸强度为4.02 MPa,断裂伸长率为57.7%,满足GTR的力学要求。进一步的细胞试验表明,PCL层适合成骨细胞的增殖,PLGA层抑制成纤维细胞的长入。一步发泡法制备的多孔PLGA/PCL双层膜满足GTR的要求,具有很大的商业潜力。
In present study, an efficient solvent-free foaming method aided by supercritical carbon dioxide (sc-CO2) is developed to prepare porous PLGA/PCL bilayer membranes for potential guided tissue regeneration (GTR) applications. First rheological properties and foaming behaviors of PLGA and PCL were studied in detail. Compared with PLGA, PCL had lower viscosity with loss tangent tan δ over 1 thus got bigger and highly interconnected pores after foaming. Based on this, membranes with distinct porous PCL and PLGA bilayer were prepared via a one-step foaming. SEM showed the pore size of the PCL layer was 80–100 μm, and that of the PLGA layer was less than 10 μm. Through tensile tests these membranes exhibited a tensile strength of 4.02 MPa and a elongation at break of 57.7 %, meeting the mechanical requirements of GTR. Further cell tests demonstrated that the PCL layer suited for the proliferation of osteoblasts and the PLGA layer inhibited the ingrowth of fibroblasts. The porous PLGA/PCL bilayer membranes fabricated using this one-step foaming meet the requirements of GTR and possess great commercial potential.
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