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 email@example.com.Show MeSH
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Mentions: Thermogravimetric analysis curves showed that there were no differences in the shapes of the graphs between indoor and outdoor degummed fibers and cocoon shells (Figure 4). However, differences were observed between cocoon shells and degummed fibers. Cocoon shells showed steady weight loss due to dehydration while degummed fibers had rapid dehydration followed by a period of constant weight. Cocoon shells required a higher temperature for dehydration. The weight loss due to dehydration was 12.92% and 12.99% for indoor and outdoor degummed fibers, respectively. A substantial weight loss followed the gradual decrease in weight as heating temperature increased. Degummed fibers commenced decomposition at higher temperatures. Rapid weight loss commenced at 283 and 279°C for indoor and outdoor degummed fibers, respectively. However, the rapid degradation of indoor and outdoor cocoon shells started at 246 and 253°C, respectively. Unlike the degummed fibers, cocoon shells exhibited multi-step decompositions at 483–506 and 710–730°C. The total weight losses were 87.3% and 82.1% for indoor and outdoor degummed fibers respectively, and 93.4% and 86.4% for indoor and outdoor cocoon shells, respectively.
Affiliation: International Centre for Insect Physiology and Ecology, P.O. Box, 30772-00100, Nairobi, Kenya firstname.lastname@example.org.