Processing-property relationships of biaxially stretched poly(L-lactic acid) sheet for application in coronary stents 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of the mechanical behavior of biomedical materials
年/卷/期
2018 / 86 /
页码
113-121
ISSN号
1751-6161
作者单位
Queens Univ, Sch Mech & Aerosp Engn, Belfast BT9 5AH, Antrim, North Ireland;Dublin City Univ, Sch Mech & Mfg Engn, Dublin 9, Ireland;Queens Univ, Sch Mech & Aerosp Engn, Belfast BT9 5AH, Antrim, North Ireland;Queens Univ, Sch Mech & Aerosp Engn, Belfast BT9 5AH, Antrim, North Ireland;
作者
Blair, R. W.;Dunne, N. J.;Lennon, A. B.;Menary, G. H.;
摘要
The development of coronary stents from poly(L-lactic acid) requires knowledge of its mechanical properties and the effects of manufacturing processes on those properties. The effects of the biaxial stretching procedure on the mechanical and microstructural properties of poly(L-lactic acid) are hereby investigated. The mechanical properties were evaluated before and after biaxial stretching, with a Design of Experiments methodology employed to identify processing parameters that had the most significant effect on the elastic modulus and yield strength of the biaxially stretched sheets. Microstructural characterisation was performed using differential scanning calorimetry to evaluate crystallinity and thermal transitions of the biaxially stretched sheets. The results show that the mechanical properties of the stretched sheets are highly dependent on the extent of stretch ratio applied during processing; however, neither the elastic modulus nor yield strength are directly attributable to crystallinity, but are affected by the degree of amorphous orientation. The results of this study have the potential to be applied in the design of high stiffness, thin-strut polymeric expandable scaffolds for the application of coronary stents.
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