Structure and properties of silk from the African wild silkmoth Gonometa postica reared indoors.
Bottom Line: The cocoons reared indoors showed inferior quality in weight, length, width, and cocoon shell ratio compared to cocoons reared outdoors.Indoor-reared cocoon shells had a significantly higher breaking strain, while the breaking stress was higher for cocoons reared outdoors.Fibers from indoor cocoons had a significantly higher breaking stress while outdoor fibers had higher breaking strain.
Affiliation: International Centre for Insect Physiology and Ecology, P.O. Box, 30772-00100, Nairobi, Kenya firstname.lastname@example.org.Show MeSH
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Mentions: The mechanical properties of cocoon shells and degummed fibers from G. postica reared indoors and outdoors are summarized in Table 2. There was a highly significant difference between the tensile properties of degummed fibers from indoor and outdoor cocoons. Indoor reared degummed fibers had higher initial modulus and breaking stress (tensile strength). Degummed fibers from cocoons reared outdoors had higher breaking strain and breaking energy. However, indoor and outdoor cocoon shells showed no significant difdifference except for breaking energy (Figure 3). Outdoor cocoon shells showed a significantly higher breaking energy. The stress-strain curves of degummed fibers had a sigmoidal shape with three distinct regions: an initial linear elastic region, a yield region, and hardening regions (Figure 3C). In contrast, in the cocoon shells, the binding points between fibers were observed to break gradually, and there was a rapid fall in stress, which indicates fiber bonding in the cocoon shells was broken and simple intertwined fibers were remained (Figure 3A, B).
Affiliation: International Centre for Insect Physiology and Ecology, P.O. Box, 30772-00100, Nairobi, Kenya email@example.com.