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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 Next Science & Mathematics Chemistry Say Goodbye to PG, Stay in a Fully Furnished Home Starting at Rs. 6000 Only | No Brokerage, Only 2 Months Deposit, Fully Setup Kitchen, Furnished with Beds, TV, Fridge, Washing Machine Nestaway Sponsored Lose Weight The Easy Way. Get Slim Now! Lose weight naturally with personalized food plans for you by India’s Best Nutritionist. Health Total has a 98% Success with 4 Lac+ Happy Customers Anjali Mukerjee Health Total Sponsored Persistent Aches And Pains Getting You Down? Our physiotherapists are trained and qualified professionals that treat you in the comfort of your home. Book your appointment and get treated today. Portea Medical Sponsored Ads Say Goodbye to PG, Stay in a Fully Furnished Home Starting at Rs. 6000 Only | No Brokerage, Only 2 Months Deposit, Fully Setup Kitchen, Furnished with Beds, TV, Fridge, Washing Machine Nestaway Sponsored Ads Chemistry Project Question: Why does the tensile strength of cotton decrease on treating with acids ? The tensile strength of plant fibres (eg.: Cotton) decreases on soaking in acids while the tensile strength of animal fibres (eg.: Wool) remain unaffected on soaking in acids. Why? The tensile strength of animal fibres decreases on soaking in alkalis or bases while the tensile strength of plant fibres remain... show more Follow 1 answer Answers Comment Best Answer: The glycosidic bond in cellulose is chemically an acetal group, and acetals are hydrolyzed by acid. Treatment by acid will partially hydrolyze the polymer chains in cellulose, in effect shortening them and thus decreasing the tensile strength. Acetals are stable to bases, so cellulose fibers retain their properties when treated with base. Animal fibers are proteins, which contain peptide bonds. The peptide bond chemically is an amide group, and amides do not readily hydrolyze in acid solution. Amides are hydrolyzed by bases, so animal fibers are hydrolyzed to shorter chains and lose their tensile strength in bases. IIRC, synthetic fibers like Nylon (which is also a polyamide like proteins) owe some of their chemical resistance to their more 'crystalline' structure, i.e., there is greater regularity in the molecular structure, and this regularity reduces the ability of bases or acids to approach the amide bonds to initiate a hydrolytic reaction. Additionally, synthetic fibers tend to be hydrophobic, and water thus is not able to hydrate the amide bond adequately to assist in attack on the amide bond to begin hydrolysis. Doctorwho · 3 years ago 0 0 Chemistry Project Question: Why does the tensile strength of cotton decrease on treating with acids ? Monthly Investment Plan Invest in best mutual funds Start as low as Rs 500 pm Answers Home All Categories Arts & Humanities Beauty & Style Business & Finance Cars & Transportation Computers & Internet Consumer Electronics Dining Out Education & Reference Entertainment & Music Environment Family & Relationships Food & Drink Games & Recreation Health Home & Garden Local Businesses News & Events Pets Politics & Government Pregnancy & Parenting Science & Mathematics Social Science Society & Culture Sports Travel Yahoo Products International About Search Answers Search Web Sign In Mail Home Mail News Cricket Movies Style Celebrity Flickr Mobile More

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Page 1: Chemistry Project Question_ Why Does the Tensile Strength of Cotton Decrease on Treating With Acids _ _ Yahoo Answers

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

Next Science & Mathematics   Chemistry

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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.

Doctorwho · 3 years ago

 0 0

Chemistry Project Question: Why does the tensile strength ofcotton decrease on treating with acids ?

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Page 2: Chemistry Project Question_ Why Does the Tensile Strength of Cotton Decrease on Treating With Acids _ _ Yahoo Answers

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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