Experimental characterisation on the behaviour of PLLA for stretch blowing moulding of bioresorbable vascular scaffolds

被引:4
作者
Wei, Huidong [1 ]
Menary, Gary [1 ]
Buchanan, Fraser [1 ]
Yan, Shiyong [1 ]
Nixon, James [1 ]
机构
[1] Queens Univ Belfast, Sch Mech & Aerosp Engn, Belfast BT9 5AH, Antrim, North Ireland
基金
欧盟地平线“2020”;
关键词
Experimental characterisation; PLLA; Free stretch blow; Water bath; DIC; MECHANICAL-PROPERTIES; POLYLACTIC ACID; POLYETHYLENE TEREPHTHALATE; POLY(L-LACTIC ACID); WATER-ABSORPTION; DEGRADATION; ORIENTATION; SIMULATION; INFLATION; CORONARY;
D O I
10.1007/s12289-020-01539-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Processing tubes from poly (l-lactic acid) (PLLA) by stretch blow moulding (SBM) is used in the manufacture of bioresorbable vascular scaffolds (BVS) to improve their mechanical performance. To better understand this processing technique, a novel experimental setup by free stretch blow inside a water bath was developed to visualise the tube forming process and analyse the deformation behaviour. PLLA tubes were heated, stretched and blown with no mould present inside a temperature-controlled water bath whilst recording the processing parameters (axial force, inflation pressure). The onset of pressure activation relative to the axial stretch was controlled deliberately to produce a simultaneous (SIM) or sequential (SEQ) mode of deformation. Real-time images of the tube during forming were captured using high speed cameras and the surface strain of the patterned tube was extracted using digital image correlation (DIC). The deformation characteristics of PLLA tubes in SBM was quantified by analysis of shape evolution, strain history and stress-strain relationship.
引用
收藏
页码:375 / 389
页数:15
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