Synthesis and characterization of thermo-insensitive, water-soluble associative polymers with good thickening properties at low and high temperatures

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• 作者：Tania E. Lara-Ceniceros (3) (4)
  Gregorio Cadenas-Pliego (1)
  Claudia C. Rivera-Vallejo (1)
  Ram贸n E. D铆az de Le贸n-G贸mez (1)
  Alejandro Coronado (2)
  Enrique J. Jim茅nez-Regalado (1)
  
  3. Centro de Investigaci贸n en Materiales Avanzados ; S. C.-Unidad Monterrey ; Alianza Norte 202 ; 66600 ; Apodaca ; Mexico
  4. Parque de Investigaci贸n e Innovaci贸n Tecnol贸gica ; Apodaca ; Nuevo Le贸n ; Mexico
  1. Centro de Investigaci贸n en Qu铆mica Aplicada (CIQA) ; Blvd. Enrique Reyna #140 ; 25253 ; Saltillo ; Coahuila ; Mexico
  2. Facultad de Ciencias Qu铆micas ; Universidad Aut贸noma de Coahuila ; Blvd. Venustiano Carranza e Ing. Jos茅 C谩rdenas Valdez ; 25280 ; Saltillo ; Coahuila ; Mexico
  
• 关键词：Thermoassociative polymers ; Amphiphilic polymers ; Multiblock copolymers ; Temperature
• 刊名：Journal of Polymer Research
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：21
• 期：7
• 全文大小：830 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  
• 出版者：Springer Netherlands
• ISSN：1572-8935

文摘

Copolymers composed of acrylamide (AM), N-isopropylacrylamide (NIPAM), and a hydrophobic monomer, either N,N-dihexylacrylamide (DHAM) or N,N-dioctylacrylamide (DOAM), were synthesized using different monomer concentrations by micellar polymerization in aqueous media. Resulting polymers were characterized by molecular weight, final composition, lower critical solution temperature (LCST), and viscoelastic properties on steady-shear state. The effect of the addition of an anionic surfactant, sodium dodecyl sulphate (SDS), was studied in order to increase the viscosity of the solution. Dynamic rheological studies were conducted to achieve a better comprehension of the parameters affecting the viscoelastic behavior of the polymers. This study allows us to understand the relationship between the rheological behavior in aqueous solution with the relaxation time (TR) and plateau modulus (G0), taking into account the intra e inter-associations present in the multiblock copolymer (hydrophobic junctions) as well as the interaction between the anionic surfactant with the hydrophobic blocks and with the NIPAM units below and above the LCST of the aqueous system.