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Preparation and Micellization of Amphiphilic Polysiloxane Copolymers

Author: MaZongBin
Tutor: YangCheng
School: Jiangnan University
Course: Materials Science
Keywords: Hydrogen silicone oil Hydrosilylation Amphiphilic graft copolymer Macromolecular micelle The critical micelle concentration (CMC)
CLC: O634.41
Type: Master's thesis
Year: 2007
Downloads: 228
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Abstract


Silicone oil (PHMS) and methyl methacrylate , glycidyl (GMA) for the synthesis of raw materials in the hydrosilylation reaction under the action of a platinum catalyst , with a pendant group containing an epoxy group of the silicone oil . IR and NMR spectra adducts structure characterization , proved successful was prepared containing epoxy groups of the silicone oil . The mass fraction of the unreacted active hydrogen by chemical titration , and thereby determining the the active hydrogen conversion rate of the silicone oil . The active hydrogen conversion rate of the reaction temperature , reaction time , amount of catalyst , and the feed ratio and other factors . Side group , an epoxy group - containing polysiloxane (PEMS) with a hydroxy endcapped macromer poly N , N - dimethyl acrylamide ( HO - PDMAAm ) and poly-N- isopropyl acrylamide (HO -PNIPAAm) through a ring-opening reaction of the epoxy groups , was prepared to the polysiloxane main chain , respectively to PDMAAm and PNIPAAm sidechain amphiphilic graft copolymer PEMS - g- PDMAAm and PEMS-g- PNIPAAm. These two graft copolymer structure was characterized by IR and NMR spectroscopy . Pyrene as a probe , using a fluorescent probe spectroscopy of aqueous micellar behavior . The results show that : the micellar behavior of the polymer concentration, length of the hydrophilic side chains of the amphiphilic copolymer . Surfactant sodium dodecyl sulfate (SDS) and fatty alcohol polyoxyethylene ethers (AEO9) with the copolymer PEMS-g-PDMAAm interaction has occurred , formation of mixed micelles . By UV spectrophotometric study critical solution temperature (Lower Critical Solution Temperature, LCST) of the copolymer PEMS-g-PNIPAAm . Neutral salt NaCl and Na2SO4 copolymer PEMS -g - PNIPAAm aqueous systems of free water into the water of hydration of salt ions , thereby weakening the hydrogen bonds between the copolymer with water molecules , and destruction of the graft copolymerization the hydration layer of the surface of the molecule , leading to the increase in its hydrophobicity .

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Elements of the organic polymer > Section IV group elements of organic polymers > Silicone polymer
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