Journal of Materials Science

, Volume 45, Issue 24, pp 6617–6622 | Cite as

Structure and properties of ultrafine silk fibers produced by Theriodopteryx ephemeraeformis

  • Narendra Reddy
  • Yiqi Yang


Theriodopteryx ephemeraeformis commonly known as bag worms produce ultrafine silk fibers that are remarkably different than the common domesticated (Bombyx mori) and wild (Saturniidae) silk fibers. Bag worms are considered as pests and commonly infect trees and shrubs. Although it has been known that the cocoons (bags) produced by bag worms are composed of silk, the structure and properties of the silk fibers in the bag worm cocoons have not been studied. In this research, the composition, morphology, physical structure, thermal stability, and tensile properties of silk fibers produced by bag worms were studied. Bag worm silk fibers have considerably different amino acid contents from those of the common silks. The physical structure of the bag worm silk fibers is also considerably different compared with B. mori and common wild silk fibers. Bag worm’s silk fibers have lower tensile strength (3.2 g/denier) and Young’s modulus (45 g/denier) but similar breaking elongation (15.3%) compared with B. mori silk. However, the tensile strength and Young’s modulus of bag worm fibers are similar to those of the common Saturniidae wild silk fibers. Bag worm silk fibers could be useful for some of the applications currently using the B. mori and wild silk fibers.


Silk Fiber Breaking Elongation Amino Acid Glycine Crystallographic Form Crystalline Amino Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors acknowledge the financial support from the Agricultural Research Division at the University of Nebraska-Lincoln, USDA Hatch Act and Multi-State Project S1026 for completing this research.


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Department of Textiles, Clothing & DesignUniversity of Nebraska-LincolnLincolnUSA
  2. 2.Department of Biological Systems EngineeringUniversity of Nebraska-LincolnLincolnUSA
  3. 3.Nebraska Center for Materials and NanoscienceUniversity of Nebraska-LincolnLincolnUSA

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