Investigation on thermomechanical properties of poly (l-lactic acid) for the stretch blow moulding process of bioresorbable vascular scaffold

Huidong Wei, Gary Menary

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Stretch blow moulding process has been used for the manufacture of bioresorbable vascular scaffold (BVS) made by poly (l-lactic acid) (PLLA) to improve its mechanical performance. In order to better understand the process, thermomechanical properties of PLLA were investigated by experimental method. Extruded PLLA sheets were biaxial stretched under strain rate of 1s−1, 4s−1 and 16s−1 to simulate the deformation process applicable in the blow moulding process. Both the equal-biaxial stretch and constant-width stretch were conducted by an in-house developed equipment. By differential scanning calorimeter (DSC), thermal analysis for materials before and after stretch were compared to evaluate the microstructural change of PLLA materials in the deformation process. A constitutive model based on glass rubber model was presented to simulate the mechanical behaviour of PLLA above glass transition under biaxial deformation.
Original languageEnglish
Title of host publication20th International ESAFORM Conference on Material Forming
Subtitle of host publicationESAFORM 2017
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735415805
Publication statusPublished - 16 Oct 2017
Externally publishedYes
Event20th International ESAFORM Conference on Material Forming - Dublin, Ireland
Duration: 26 Apr 201728 Apr 2017
Conference number: 20

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference20th International ESAFORM Conference on Material Forming
Abbreviated titleESAFORM 2017

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