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Fang K.,Qingdao University | Fang K.,Laboratory of Fibre Materials and Modern Textiles | Fang K.,Collaborative Innovation Center for Marine Biomass Fibres | Xia X.,Qingdao University | And 7 more authors.
Coloration Technology | Year: 2015

Blue poly(styrene-co-methacrylic acid) nanospheres were prepared by dyeing polymer dispersions with CI Disperse Blue 56. The coloured nanospheres had a clear shell with a thickness of 32.5 nm. The average diameter of the nanospheres increased from 288 to 353 nm, and the glass transition temperature was raised from 109.6 to 117.9 °C after coloration. Ultraviolet-visible absorption spectra, transmission electron microscopy, and differential scanning calorimetry show that the amino and/or hydroxyl groups of the disperse dyes formed hydrogen bonds with the carboxyl groups on the surfaces of the nanospheres during the coloration process, resulting in increased particle sizes and shell layers. The dye content increased almost linearly with increasing dye concentrations or dyeing temperatures within a certain range. By increasing the pH of the dyeing bath from 4 to 5, the dye content increased sharply from 0.68 to 1.49% because of the ionisation of the carboxyl groups of the macromolecules. © 2015 Society of Dyers and Colourists.

Ma X.,Qingdao University | Ma X.,Collaborative Innovation Center for Marine Biomass Fibres | Guo L.,Qingdao University | Ji Q.,Qingdao University | And 6 more authors.
Polymer Chemistry | Year: 2016

Cationic chitosan was exploited originally as a macro-cross-linker to prepare hydrogels with superb extensibility, perfect elasticity, high toughness and fatigue-resistance by one-step free-radical polymerization. The as-developed approach can be applied to a broad range of hydrophilic monomers and unsaturated Brønsted-Lowry acids, leading to hydrogels with tunable performance. © 2015 The Royal Society of Chemistry.

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