Synthesis And Properties Of Amphiphilic Copolymer In The Presence Of Hydroxypropyl-β-Cyclodextrins In Aqueous Solution

Cyclodextrins are cyclic oligoamyloses, consisting of 6, 7, 8 or 9 units of a-1-4 linked glucose. The special dimesional configuration make the cyclodextrins possessing characteristics of that the cavity is hydrophobic and the cyclodextrin surface is hydrophilic. The hydrophobic cavity of the cyclodextrins can be as the accepters that are encapsulate small lipophilic molecules and small hydrophobic units of soluble polymers. Because of their hydrophobic cavity and hydrophilic surface they are able to encapsulate small lipophilic molecules through non-covalent bond. They have been used in molecule recognition, stationary phases of chromatography, catalysis, solubilization, control release of drugs, biotechnology and so on.First hydrophobic monomer styrene was complexed with hydro xyprop yl -β-cyclodextrin. The copolymerization of complexed styrene with acrylamide was carried out in water using potassium persulfate as radical initiator at 65 ℃. The copolymerization can obtain high yield and molecular weighs compared to the polymers prepared in organic solvent. The copolymers were characterized by the spetra of H-NMR. The Effect of apparent viscosity vs. polymer concentration show that its reduced viscosity have a mutation at the critical concentration of copolymers and properties of hydrophobically associating water-soluble polymers. The surface tension was measured at 25 ℃ using the Wilhemy plate method with a K12 processor tensiometer .The cationic amphiphilic copolymer are synthesized by the copolymer ization of acrylamide , methacryloxyethyl trimethyl ammonium chloride with butyl acrylate in water in the presence of hydropropyl-β-cyclodextrin using potassium persulfate as radical initiator. The copolymers are characterized by the spectra of FT-IR. The changes of the reduced viscosities of copolymerssolution are observed in the pure water and in the salt solution. The changes correlated with concentration of the polymers is different from that the changes of hydrophobically associating water soluble polymers. The mechanism of phenomenon is briefly discussed. The aggregation morphology in the salt solution is observed with scanning electron microscopic(SEM) and transmission electron microscopic(TEM). The salt crystal become much bigger and in more regular arrangement with the increase of this polymer concentration. The salt can form beautiful huge tree-like crystals. The images of the SEM in the NaCl solution show that there are a large different from the images of SEM in the NaBr or Nal solution. The mechanism of aggregation morphology is briefly discussed.The anionic amphiphilic copolymer was also synthesized by the copolymerization of acrylamide, sodium 2-acrylamido-2-methypropane sulfonate with butyl acrylate in water in the presence of hydropropyl-β -cyclodextrin. The structure of the copolymer was asterined by 1h NMR. We also observed beautiful huge tree-like crystals at the NaCl solution of the copolymer from SEM. The images of the SEM in the NaCl solution show that there are a large different from the images in the NaBr or CaCl2 solution. The mechanism of aggregation morphology is briefly discussed.