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Tensile Property and Morphology of Differently Degummed Silkworm(Bombyx Mori) Cocoon Silk Fibers and the Cocoon Silk Fibers from Transgenic Silkworm (Bombyx Mori) with Synthetic MaSpI Gene

Author: WangChangHe
Tutor: GuoCong
School: Sichuan University
Course: Zoology
Keywords: Silkworm cocoon Degumming rate Mechanical properties Monofilament An initial modulus Yield point Breaking load Spider Draggling wire Amino acid composition Elongation
CLC: TS143
Type: Master's thesis
Year: 2006
Downloads: 220
Quote: 3
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Abstract


With distilled water , boric acid . Borate buffer , sodium carbonate, urea and succinic acid silkworm cocoon degumming and single fiber strength tester test of the mechanical behavior of these five degummed silk load . Displacement curve , the results show that the type of degumming method causing varying degrees of impact on the mechanical behavior of the cocoon , including the initial slope and the lower yield point , wherein the sodium carbonate and urea degumming These results indicate that at least weaken a degumming greatest impact non-covalent bonds , such as hydrogen bonding or van der Waals keys , key weakening to accelerate the breakage of the wire . Sericin silk mechanical properties are almost no contribution , but its the silk fiber cross-sectional area there is great contribution to the degree of degumming of different degumming method type , and therefore a cross -sectional area of the wire with the degumming of the load - displacement curve is converted into stress - strain curve , you can not reproduce degumming two core molecular structure of silk fibers . There are the following two factors affect the degumming of silk mechanical properties: 1 ) the molecular structure of the two core silk fibers change , including intermolecular and / or intramolecular structural change ; 2 ) degumming rate . Accordingly, the interpretation of the stress - strain curve needs to take into account the rate of degumming , i.e. in the case of the same degumming rate stress - strain curve meaningful . This experiment, near continuous filament fibers , the mechanical properties of the adjacent core wire fiber with similar two core wire cross - sectional area of the fiber in the the unglued similar case , the alignment of the load - displacement curve is converted into a stress - strain curve, the shape of the curve obtained for the same. Unglued molecular structure of the silk fibers of the two core performance by unglued before and after the changes in mechanical behavior and mechanical properties of the silk . In addition, by scanning electron microscopy were observed on the surface of degummed silk , scanning electron microscopy images show that the different methods unglued cocoon has a different appearance form . Distilled water produced only a partial degumming ; urea is not completely unglued , and dents and holes visible corrosion ; sodium carbonate degumming effect more

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CLC: > Industrial Technology > Light industry,handicrafts > Textile industry,dyeing and finishing industry > Silk textile > System Sijia
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