Test 1 Study Guide - Textiles Test 1 9.22.11 Cotton Rayon...

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Unformatted text preview: Textiles Test 1 9.22.11 Cotton Rayon Acetate T r iacetate Cellulose Natural Manmade Modified cellulose Modified cellulose Wet spinning Wet spinning Dry spinning Dry spinning Functional group OH (hydrophilic) H bond with water and each other OH (hydrophilic) H bond with water and each other Ch3COO (acetate), hydrophobic Ch3COO (acetate), hydrophobic Molecular orientation High High Middle low Molecular weight High High Low Low Strength/tenac ity High Lower Lowest Resiliency, elongation, elastically recovery Low Low High highest Wet strength Increases when wet Decreases when wet Decreases Decreases Moisture regain absorbency High High Middle Low Heat resistance High High Low * acetate becomes plastic, under heat it melts Low Resistance to alkaline High High Or Or Resistance to biological species Low **biological species (bacteria) like moisture Low High high Laundry/mach ine wash Yes No No No **dry clean, hand wash due to low tenacity Alkaline detergents Yes Yes Yes Yes High heat Yes Yes Mild Mild Chlorine bleach Yes Yes Yes yes I ntroduction to Textiles o Textiles Fibers Classification natural and manmade fibers cotton, wool, silk natural produced naturally in agriculture, not an industrial process man made - rayon, polyester fiber classified in chemistry/chemical industry regenerated (rayon, acetate) natural things are used to create these fibers but they do not occur naturally raw material is found in nature trees synthetic (nylon, polyester, acrylic) nylon was first marketed in 1938 all synthetic fibers come from crude oil nylon liquid - solid, wax, less volatile oil staple and filament fibers staple - short fiber most natural fibers are staple EXCEPT silk filament - long fiber silk is a natural fiber that also a filament o textile manufacturing process American textile industry Challenge as a result of globalization o Chemistry basics for understanding textiles Fibers are made from polymers Polymers - big molecule made of hydrogen, oxygen, nitrogen Covalent bonding Sharing electrons Ionic bonding H bonding Organic Compounds and Functional groups 1. CH4 methane 1. CH3 - CH3 Ethane 2. CH2 = CH2 ethene or ethylene 1. monomer for polyethylene 2. functional group 1. part of a molecule which is reactive, which make this group of compounds with the same functional group to have the same chemical reaction 2. compound with the same functional group will have the same reactions 3. CH2=CH2 ------------------>( CH2-CH2)n 1. n = degree of polymerization 1,000 2. CH2 = CH2 - monomer 3. CH2 - CH2 = repeating unit in a polymer molecule 1. only a 1/6, 1/1000 of the polymer 4. the repeating unit and the monomer are different 1. the repeating unit is not a molecule, it is just the building block of the polymer 4. CH2 = CH - CH3 --------> CH2-CH-CH3 1. the synthesis of polypropene around 1956 2. Alcohol 1. CH3 - CH2 - OH 2. functional group - OH (hydroxyl)...
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Test 1 Study Guide - Textiles Test 1 9.22.11 Cotton Rayon...

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