Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (3): 505-511.doi: 10.3866/PKU.WHXB201501192

• SOFT MATTER • Previous Articles     Next Articles

Formation of Colloidal Spheres from a Lignin-Based Azo Polymer

DENG Yong-Hong, LIU You-Fa, ZHANG Wei-Jian, QIU Xue-Qing   

  1. State Key Laboratory of Pulp and Paper Engineering, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
  • Received:2014-11-19 Revised:2015-01-16 Published:2015-03-06
  • Contact: QIU Xue-Qing
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21436004, 21374032).


2-(4-Ethyl formate phenyl azo) phenol lignin-modified polymer (AL-azo-COOEt), a novel ligninbased azo polymer, has been successfully synthesized from alkali lignin (AL) recovered from pulping black liquor. The micellization process of the AL-azo-COOEt polymer was also studied. The synthetic products were characterized by elemental analysis, Fourier transform infrared (FT- IR) spectra, proton nuclear magnetic resonance (1H NMR) spectroscopy, and ulraviolet-visible (UV-Vis) spectroscopy. The formation of the micelles was monitored by laser light scattering (LLS), and a scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to characterize the surface morphology of the colloidal spheres. X-ray photoelectron spectroscopy (XPS) and elemental analysis were used to obtain the surface element distribution and average element content of the colloidal spheres, respectively. Results show that lignin-based azo polymer AL-azo-COOEt can form uniform solid colloidal spheres by hydrophobic aggregation. Colloidal spheres formed gradually when the water content increased beyond the critical water content (CWC), The CWC has a linear relationship with the logarithm of the initial concentration of AL-azo-COOEt (C0). The colloidal spheres consist of a relatively hydrophobic interior and a relatively hydrophilic surface. The AL-azo-COOEt colloidal spheres can load Doxorubicin (DOX) and the in vitro release can be controlled by adjusting the pH of buffered solution.

Key words: Alkali lignin, Azo polymer, Self-assembly, Colloidal sphere, Micelle loading


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