The development of biomimetic highly-porous scaffolds is essential for successful tissue engineering. Segmented poly(ester urethane)s and poly(ester urethane urea)s have been infrequently used for the fabrication of electrospun nanofibrous tissues, which is surprising because these polymers represent a very large variety of materials with tailored properties. This study reports the preparation of new electrospun elastomeric polyurethane scaffolds. Two novel segmented polyurethanes (SPU), synthesized from poly(epsilon-caprolactone) diol, 1,6-hexamethylene diisocyanate, and diester-diphenol or diurea-diol chain extenders, were used (Caracciolo et al. in J Mater Sci Mater Med 20:145-155, 2009). The spinnability and the morphology of the electrospun SPU scaffolds were investigated and discussed. The electrospinning parameters such as solution properties (polymer concentration and solvent) and processing parameters (applied electric field, needle to collector distance and solution flow rate) were optimized to achieve smooth, uniform bead-free fibers with diameter (~700 nm) mimicking the protein fibers of native extracellular matrix (ECM). The obtained elastomeric polyurethane scaffolds could be appropriate for soft tissue-engineering applications.

译文

:仿生高多孔性支架的开发对于成功的组织工程至关重要。分段聚(酯氨基甲酸酯)和聚(酯氨基甲酸酯脲)已经很少用于电纺纳米纤维组织的制造,这是令人惊讶的,因为这些聚合物代表了具有定制性质的多种材料。这项研究报告了新型电纺弹性聚氨酯支架的制备。使用了两种由聚(ε-己内酯)二醇,1,6-六亚甲基二异氰酸酯和二酯-二酚或二脲-二醇扩链剂合成的新型分段聚氨酯(SPU)(Caracciolo et al。in J Mater Sci Mater Med 20 :145-155,2009)。研究并讨论了静电纺SPU支架的可纺性和形态。优化了电纺丝参数,例如溶液特性(聚合物浓度和溶剂)和加工参数(施加的电场,针到收集器的距离和溶液流速),以实现直径均匀(〜700 nm)的光滑,均匀的无珠纤维,其模拟天然细胞外基质(ECM)的蛋白质纤维。所获得的弹性体聚氨酯支架可适用于软组织工程应用。

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