Polyurethane membrane with temperature- and pH-Controllable permeability for amino-acids

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• 作者：Hu Zhou (1)
  Ruiping Xun (1)
  Kejian Wu (1)
  Zhihua Zhou (1)
  Bin Yu (1)
  Youxin Tang (1)
  Ning Li (1)
  
  1. Key Laboratory of Theoretical Organic Chemistry and Function Molecule ; Ministry of Education ; Hunan Province College Key Laboratory of QSAR/QSPR ; School of Chemistry and Chemical Engineering ; Hunan University of Science and Technology ; Xiangtan ; 411201 ; P. R. China
  
• 关键词：polyurethane ; membrane ; temperature response ; pH response ; L ; phenylalanine ; permeate flux ; rejection coefficient
• 刊名：Macromolecular Research
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：23
• 期：1
• 页码：94-99
• 全文大小：744 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Polymer Sciences
  Characterization and Evaluation of Materials
  Soft and Granular Matter, Complex Fluids and Microfluidics
  Nanochemistry
  Nanotec
  
• 出版者：The Polymer Society of Korea, co-published with Springer
• ISSN：2092-7673

文摘

This work was focused on the investigation of the temperature- and pH-responsive polyurethane (PU) membranes and their permeability to amino-acids in response to environmental stimuli. The PU membrane was prepared from a wet phase inversion method and a two-step solution polymerization from polycaprolactone diols (PCL), 4,4'-diphenylmethane diisocyanate (MDI), dimethylol propionic acid (DMPA), etc. The chemical structure, phase state, morphology and surface wettability of the membrane were characterized with Fourier transform infrared (FTIR) spectrometer, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and contact angle tester, respectively. The temperature and pH responses of the membrane were investigated by means of an amino-acid permeate experiment. The L-phenylalanine (L-Phe) was chosen as model amino-acids. The permeation of the L-Phe was measured using a dead-end flow filtration at varied temperatures and pH, and characterized by the permeate flux (J) and rejection coefficient (R). J of the L-Phe across the PU membrane increased with increasing temperature and showed a sharp increase when temperature was raised to the crystalline melting temperature (T m ) of the soft segment of PU, while decreased with increasing pH and having a sharp decrease when pH reached the dissociation constant (pK a ) of DMPA contained in PU macromolecules. While, the R behavior of L-Phe was just opposite from the results of J, which decreased with increasing temperature and increased with increasing pH, also showing the temperature and pH responses. Hopefully, the PU membrane with temperature- and pH-controllable permeability has promising prospects in water treatment, membrane separation, drug delivery system, etc.