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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Identification and quantification of the crystalline structures of poly(vinylidene fluoride) sutures by wide-angle X-ray scattering and differential scanning calorimetry.
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Identification and quantification of the crystalline structures of poly(vinylidene fluoride) sutures by wide-angle X-ray scattering and differential scanning calorimetry.

机译：通过广角X射线散射和差示扫描量热法鉴定和量化聚偏二氟乙烯缝合线的晶体结构。

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摘要

The outstanding biocompatibility of the polyvinylidene fluoride (PVDF) monofilament suture together with other desirable characteristics, such as ease of handling and resistance to biodegradation, makes it an attractive alternative monofilament suture material for cardiovascular surgery. However, to achieve a high performance suture, the polymeric raw material must be exposed to different treatments, which lead to different degrees and types of crystallization. Since these crystalline modifications deeply influence the mechanical characteristics and the biostability of the sutures, the authors hereby propose a method of quantifying the different structures of PVDF using wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). The commercial devices are achieved by coloring and processing the polymeric raw material. The white and unprocessed 4-0 unswaged suture presents 19% of the alpha phase, 38% of the beta structure, and no gamma form. Coloration increases the amount of the beta phase by 5-9% at the expense of the alpha phase. On the other hand, processing the fibers lead to the conversion of some of the amorphous phase to the gamma structure, the importance of which is 6-7%. Finally, tensile measurements performed on the different PVDF fibers clearly proves that their mechanical characteristics depend on the presence of these crystalline forms in the polymeric structure of PVDF.
机译：聚偏二氟乙烯（PVDF）单丝缝合线具有出色的生物相容性以及其他所需的特性，例如易于处理和抗生物降解性，使其成为心血管外科手术的诱人替代单丝缝合线材料。然而，为了获得高性能的缝合线，必须将聚合物原料进行不同的处理，这导致不同程度和类型的结晶。由于这些晶体修饰深刻地影响了缝合线的机械特性和生物稳定性，因此作者提出了一种使用广角X射线衍射（WAXD）和差示扫描量热法（DSC）量化PVDF不同结构的方法。商业设备是通过对聚合物原料进行着色和加工来实现的。白色且未加工的4-0未缝合缝线呈现19％的α相，38％的β结构，并且没有γ形式。着色会使β相的含量增加5-9％，而以α相为代价。另一方面，对纤维进行加工会导致一些非晶相转变为伽玛结构，其重要性为6-7％。最后，在不同的PVDF纤维上进行的拉伸测量清楚地证明了它们的机械特性取决于PVDF聚合物结构中这些晶体形式的存在。

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