Selective Surface Modification of Biopolymers Polymers vs. Biopolymers Wettability in addition to Applications The First Biopolymer The Next Polymer

Selective Surface Modification of Biopolymers Polymers vs. Biopolymers Wettability in addition to Applications The First Biopolymer The Next Polymer www.phwiki.com

Selective Surface Modification of Biopolymers Polymers vs. Biopolymers Wettability in addition to Applications The First Biopolymer The Next Polymer

Steinmehl, Eric, Managing Editor has reference to this Academic Journal, PHwiki organized this Journal Selective Surface Modification of Biopolymers REU Progress Presentation Presented by Alicia Certain Advisor Jeffrey Youngblood August 4, 2004 Polymers vs. Biopolymers Familiar examples: garbage bags, milk jugs, car bumpers, motor oil, carpet fibers, plumbing pipes Biopolymers: The “green” materials Made from renewable resources Biodegradable Have different properties than traditional polymers Wettability in addition to Applications An increase in wettability would be desirable as long as applications such as textiles, cleaning wipes, household fabrics A decrease in wettability would be desired as long as packaging

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The First Biopolymer Family of polyhydroxyalkanoates (PHAs) Worked with poly(lactic acid) (PLA) Trade name “Natureworks” Produced from corn The Next Polymer From the family of 1,3, propanediol Specific polymer is poly(propylene-terephthalate) (PPT) Trade name “Sorona” Also comes from corn Modification of Biopolymers Samples were spin coated onto glass slides Goal was to modify the surface of the polymers in order to change wettability Worked with three chemical modifications APTES Hydrolysis Aminolysis

APTES modification 3-aminopropyltriethoxysilane Previously used to modify PET Increased wettability What will it do to biopolymers Hydrolysis Immersion in aqueous alkaline base Breaks up chain, adding hydroxyl group to one end, hydrogen to the other Should increase wettability Simplest procedure Aminolysis Similar to hydrolysis, using an amine instead Tried n-butylamine, which is known to increase wettability in PET – very slow! Used n-lithiodiamine to decrease reaction times

Contact Angle Analysis Liquid drop on solid surface modifies its shape based on the interfacial tensions Creates a material property of the system called the “contact angle” Characterization Contact angle measurements primary characterization Tests done through the goniometer AFM imaging used to augment Wettability Results

Untreated PLA 2 minutes 15 minutes

Optimal Times Wettability Results Contact Angles 15 minutes 30 minutes 45 minutes

Wettability Results Wettability Results PPT in addition to APTES Most successful in decreasing wettability 6 hours led to approx. 55 degree advancing, 0 receding 24 hours led to approx. 45 degree advancing, 0 receding 72 hours created an increase back to approx. 60 advancing, 0 receding

Flourinated APTES 24 hour APTES reaction on PLA with concentration cut in half Subsequent reaction with tridecaflouro-1,1,2,2-tetrahydrooctyltri-chlorosilane APTES on PLA only increases wettability slightly, but surface is functionalized in addition to flourination successfully decreases wettability Possible Future Directions APTES optimization Pinpointing a more definite optimum PLA hydrolysis time Vapor phase reactions Subsequent reactions on functionalized surfaces to increase hydrophobicity rather than decrease Thanks! Prof. Youngblood in addition to Prof. Kvam John, Ben, in addition to Phil Allen in addition to Kendra The REU Group

Steinmehl, Eric Fertility & Sterility Managing Editor www.phwiki.com

Steinmehl, Eric Managing Editor

Steinmehl, Eric is from United States and they belong to Fertility & Sterility and they are from  Birmingham, United States got related to this Particular Journal. and Steinmehl, Eric deal with the subjects like Obstetrics and Gynecology

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This Particular Journal got reviewed and rated by Ecole Nationale Suprieure des Mines de Douai and short form of this particular Institution is FR and gave this Journal an Excellent Rating.