chemistry project question_ why does the tensile strength of cotton decrease on treating with acids...
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11/19/2015 Chemistry Project Question: Why does the tensile strength of cotton decrease on treating with acids ? | Yahoo Answers
https://in.answers.yahoo.com/question/index?qid=20130103201116AAGcDsN 1/2
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Chemistry Project Question: Why does thetensile strength of cotton decrease ontreating with acids ?The tensile strength of plant fibres (eg.: Cotton) decreases on soaking in acidswhile the tensile strength of animal fibres (eg.: Wool) remain unaffected onsoaking in acids. Why? The tensile strength of animal fibres decreases onsoaking in alkalis or bases while the tensile strength of plant fibres remain...show more
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Best Answer: The glycosidic bond in cellulose is chemically an acetalgroup, and acetals are hydrolyzed by acid. Treatment by acid will partiallyhydrolyze the polymer chains in cellulose, in effect shortening them and thusdecreasing the tensile strength.
Acetals are stable to bases, so cellulose fibers retain their properties whentreated with base.
Animal fibers are proteins, which contain peptide bonds. The peptide bondchemically is an amide group, and amides do not readily hydrolyze in acidsolution. Amides are hydrolyzed by bases, so animal fibers are hydrolyzed toshorter chains and lose their tensile strength in bases.
IIRC, synthetic fibers like Nylon (which is also a polyamide like proteins) owesome of their chemical resistance to their more 'crystalline' structure, i.e.,there is greater regularity in the molecular structure, and this regularity reducesthe ability of bases or acids to approach the amide bonds to initiate ahydrolytic reaction. Additionally, synthetic fibers tend to be hydrophobic, andwater thus is not able to hydrate the amide bond adequately to assist in attackon the amide bond to begin hydrolysis.
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Chemistry Project Question: Why does the tensile strength ofcotton decrease on treating with acids ?
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11/19/2015 Chemistry Project Question: Why does the tensile strength of cotton decrease on treating with acids ? | Yahoo Answers
https://in.answers.yahoo.com/question/index?qid=20130103201116AAGcDsN 2/2
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