电子束辐照对医用聚氨酯化学和结构性能的影响
The influence of electron beam irradiation on the chemical and structural properties of medical grade Polyurethane
摘要：
热塑性聚氨酯（TPU）具有优异的生物相容性、柔韧性和良好的耐辐照性;然而，极高的辐照剂量会改变大分子的结构和功能，导致氧化、断链和交联。本文研究了电子束辐照对医用热塑性聚氨酯的影响。研究了分子链长及其分布的变化以及分子结构的变化。GPC（凝胶渗透色谱）结果表明，氧化分解后，分子量下降，同时多分散性增加。这表明降解非常不均匀，这是特定过程和氧化降解强度的结果。这通过机械性能测量得到证实。总的来说，这项研究表明，医用级TPU受到辐射暴露的影响，特别是在高辐射剂量下。
英文摘要：
Thermo plastic polyurethane (TPU) provides excellent bio-compatibility, flexibility and good irradiation resistance; however, extremely high irradiation doses can alter the structure and function of macromolecules, resulting in oxidation, chain scission and cross-linking. In this study, the effects of e-beam irradiation on the medical grade thermo plastic polyurethane were studied. The changes in the chain length and their distribution as well as the changes in molecular structure were studied. The GPC (Gel Permeation Chromatography) results show that the oxidative decomposition is followed by a decrease in molecular mass together with an increase in polydispersity. This indicates a very inhomogeneous degradation, which is a consequence of the specific course and of the intensity of oxidative degradation. This was confirmed by means of mechanical property measurements. Overall, this study demonstrated that the medical grade TPU was affected by radiation exposure, particularly at high irradiation doses.
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