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Effects of annealing constraint methods on poly(L‐lactic acid) monofilaments for application in stents annealing
Author(s) -
Li Xin,
Tian Yuan,
Zhang Jing,
Cheng Jie,
Wu Gensheng,
Zhang Yi,
Zhao Gutian,
Ni Zhonghua
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5266
Subject(s) - materials science , annealing (glass) , crystallinity , composite material , crystallite , metallurgy
Mechanical properties of poly(L‐lactic acid) (PLLA) braided stents are closely related to the performance of the weaving monofilaments. In this study, the PLLA monofilaments were prepared via solid‐state drawing (SSD) method and annealed with different constraint methods. Experimental results show that mechanical properties of fabricated monofilaments have been greatly improved by SSD method. With the constrained annealing method, mechanical properties can be further improved while negative effect is shown with unconstrained annealing method. The physicochemical properties of PLLA monofilaments were further characterized, and it is found that the draw ratio of SSD and annealing method can affect the crystallinity and crystallite size, which can directly influence the mechanical properties of the monofilaments. This work tells that it is necessary to consider collectively the effects of SSD method and annealing method of the monofilaments in order to obtain optimized mechanical properties of the braided stents.