Temperature and pH-responsive properties of poly(styrene-co-maleic anhydride)-grafting poly(oxypropylene)-amines.
A series of temperature- and pH-responsive copolymers were prepared by grafting poly(oxypropylene)-diamines (POP-amine) onto poly(styrene-co-maleic anhydride) (SMA) copolymers. Owing to the presence of poly(oxypropylene)-segments in the pendants and their expressive hydrogen bonding properties, the copolymers exhibited lower critical solution temperature (LCST) behavior in water with a range of 11-49 degrees C depending on the POP-segmental weight and the SMA backbone structure. Furthermore, the co-existence of -NH(2) termini in the pendants and amidoacids in the linking sites in the structures rendered the copolymers also responsive to environmental pH changes. Structural variations in the SMA backbones, particularly the ratio of styrene/maleic anhydride monomers, POP lengths, and amine functionalities largely influenced the copolymer aggregation in the medium with different pH or thermal conditions. The responsiveness was correlated to the surface morphologies observed by tapping/phase mode atomic force microscopy (TM-AFM) on Mica film surface and also fluorescent properties in aqueous solution.
Lin
Jiang-Jen
JJ
Institute of Polymer Science and Engineering, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan. jianglin@ntu.edu.tw
Hsu
Yen-Chi
YC
D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D006863:Hydrogen-Ion Concentration; D008298:Maleates / Q000138:chemical synthesis / Q000737:chemistry*; D010316:Particle Size; D011126:Polypropylenes / Q000138:chemical synthesis / Q000737:chemistry*; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry*; D013053:Spectrophotometry; D013696:Temperature
D008298:Maleates; D011126:Polypropylenes; D011137:Polystyrenes; C521900:poly(styrene-co-maleic anhydride); C064807:polyoxypropyleneamine