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Textile Research Journal, Vol. 76, No. 7, 540-546 (2006)
DOI: 10.1177/0040517506065255

Negative Poisson’s Ratio Polyester Fibers

Naveen Ravirala

Centre for Materials Research & Innovation, University of Bolton, Deane Road, Bolton, BL3 5AB, UK

Kim L. Alderson

Centre for Materials Research & Innovation, University of Bolton, Deane Road, Bolton, BL3 5AB, UK

Philip J. Davies

Centre for Materials Research & Innovation, University of Bolton, Deane Road, Bolton, BL3 5AB, UK

Virginia R. Simkins

Centre for Materials Research & Innovation, University of Bolton, Deane Road, Bolton, BL3 5AB, UK

Andrew Alderson

Centre for Materials Research & Innovation, University of Bolton, Deane Road, Bolton, BL3 5AB, UK, a.alderson{at}bolton.ac.uk

Auxetic materials are referred to as those having negative Poisson’s ratio ({nu}). Initial work at Bolton successfully fabricated auxetic polypropylene fiber using a novel thermal melt-spinning technique. This paper reports in detail both the methods and principles involved in screening polyester powder and also the manufacturing method for successful production of auxetic polyester fibers. Videoextensometry along with micro-tensile testing were used to measure the Poisson’s ratio of the fiber. The Poisson’s ratio of the polyester fiber was found to vary between -0.65 and -0.75.

Key Words: auxetic • negative Poisson’s ratio • polyester fiber • videoextensometry


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