91208Lecture_8

91208Lecture_8 - Today Workshops Start next weeksign up now...

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Today 9/13/07 Workshops Start next week…sign up now! Group Tutoring in Moon from 9:30- 11:30 AM on Monday 109 Moon! Anthony Fuoco (no extra credit) My Office Hours Next Week Monday/Wednesday 9:30-11:30 AM Tuesday and Thursday 11AM-4PM NO HOURS on FRIDAY!
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Today’s  Topic:   Tie  Dyeing
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Chemistry of Dyeing Textiles Vat Dyeing Hot T process Batiks Hot T process Use of Wax to protect and apply other colors Tie Dyeing Cold T process
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Tie Dyeing Fiber Reactive Dye 4-steps all chemical Soda Ash Tie Add Dye Rinse out unreacted dye
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So what’s going on? Cellulose Soda Ash (Na 2 CO 3 ) is a mild base that increases the pH and makes the H on the - CH 2 OH group accessible to the dye 1. Soda Ash
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Dye Molecules Two distinct regions N N N Cl Cl H N O O SO 3 Na Chromophore Fiber Binding Region Dichlorotriazene Procion MX - Brilliant Blue 3. Add Dye
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Dyeing N N N Cl Cl H N Chromaphore O H O H HO H H OH H O OH * * n + N N N Cl H N Chromaphore O H O H HO H H OH H O O * * n + H Cl 3. Add Dye
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91208Lecture_8 - Today Workshops Start next weeksign up now...

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