Collaborative Innovation Center for Marine Biomass Fibres

Qingdao, China

Collaborative Innovation Center for Marine Biomass Fibres

Qingdao, China
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Tan L.,Collaborative Innovation Center for Marine Biomass Fibres | Tan L.,Qingdao University | Shi R.,Collaborative Innovation Center for Marine Biomass Fibres | Shi R.,Qingdao University | And 8 more authors.
Polymers and Polymer Composites | Year: 2017

Carboxymethylcellulose (CMC), including the acid form (CMC-H) and salt forms (CMC-Na, CMC-Ca), were prepared for the survey of thermal degradation and the CMC-H was obtained by acidifying CMC-Na with HCl. An online-coupled thermogravimetric (TG)-FTIR evolved gas analysis instrument was used to identify and monitor the evolution of gaseous products during the thermal degradation of CMC in air. The thermal degradation characteristics of CMC-H and salt forms CMC-Na, CMC-Ca of carboxymethylcellulose were compared to determine the effect of Na+ and Ca2+ counter-ions on CMC thermal degradation in air. From the TG and DTG curves, thermal degradation of the samples occurred in three stages. During the second stage (200-410 °C) major degradation occurred, accompanied by a large weight loss. The 3D FTIR absorbance spectra and Gram-Schmidt curves of the evolved gases were obtained. In compounds CMC-Na and CMC-Ca, the initial degradation temperature is higher, the rate of CMC degradation increases, and the weight loss in the temperature range 200-410 °C decreases. These samples also catalyse the stable intermediate products in the temperature range 410-600 °C. © Smithers Information Ltd., 2017.


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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