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    High orientation of long chain branched poly (lactic acid) with enhanced blood compatibility and bionic structure

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    Publication date
    2016-03-25
    Author
    Li, Z.
    Ye, L.
    Zhao, X.
    Coates, Philip D.
    Caton-Rose, Philip D.
    Martyn, Michael T.
    Keyword
    Poly (lactic acid) (PLA)
    Long chain branching
    Mechanical properties
    Blood compatibility
    Bionic character
    Rights
    © 2016 Wiley Periodicals, Inc. Full-text reproduced in accordance with the publisher’s self-archiving policy. This is the peer reviewed version of the following article: Li Z, Ye L, Zhao X, Coates PD, Caton- Rose F and Martyn MT (2016) High orientation of long chain branched poly (lactic acid) with enhanced blood compatibility and bionic structure. Journal of Biomedical Materials Research, Part A. 104(5): 1082-1089, which has been published in final form at http://dx.doi.org/10.1002/jbm.a.35640. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/ WileyCDA/Section/id-820227.html#terms).
    Peer-Reviewed
    Yes
    
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    Abstract
    Highly-oriented poly (lactic acid) (PLA) with bionic micro-grooves was fabricated through solid hot drawing technology for further improving the mechanical properties and blood biocompatibility of PLA. In order to enhance the melt strength and thus obtain high orientation degree, long chain branched PLA (LCB-PLA) was prepared at first through a two-step ring-opening reaction during processing. Linear viscoelasticity combined with branch-on-branch (BOB) model was used to predict probable compositions and chain topologies of the products, and it was found that the molecular weight of PLA increased and topological structures with star like chain with three arms and tree-like chain with two generations formed during reactive processing, and consequently draw ratio as high as1200% can be achieved during the subsequent hot stretching. With the increase of draw ratio, the tensile strength and orientation degree of PLA increased dramatically. Long chain branching and orientation could significantly enhance the blood compatibility of PLA by prolonging clotting time and decreasing platelet activation. Micro-grooves can be observed on the surface of the oriented PLA which were similar to the intimal layer of blood vessel, and such bionic structure resulted from the formation of the oriented shish kebab-like crystals along the draw direction.
    URI
    http://hdl.handle.net/10454/8031
    Version
    Accepted Manuscript
    Citation
    Li Z, Ye L, Zhao X et al (2016) High orientation of long chain branched poly (lactic acid) with enhanced blood compatibility and bionic structure. Journal of Biomedical Materials Research, Part A. 104(5): 1082-1089.
    Link to publisher’s version
    http://dx.doi.org/10.1002/jbm.a.35640
    Type
    Article
    Collections
    Engineering and Informatics Publications

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