Synthesis and evaluation of properties of novel poly(benzimidazole‐amide)s |
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Authors: | Juan J Ferreiro José G de la Campa Angel E Lozano J de Abajo Jack Preston |
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Institution: | 1. Instituto de Ciencia y Tecnología de Polímeros, Consejo Superior de Investigaciones Científicas. Juan de la Cierva 3, Madrid 28006, Spain;2. College of Textiles, Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, North Carolina 27695‐8301 |
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Abstract: | Novel aromatic polyamides have been prepared by a combination of diacids containing preformed benzimidazole rings and aromatic diamines. By the phosphorylation method of polycondensation, polymers of high molecular weight (inherent viscosities between 0.81 and 2.13 dL/g) were obtained, which showed good solubility in polar aprotic solvents. The combination of aromatic amide linkages and benzimidazole rings along the polymer chain endowed the polymers with high thermal resistance and excellent mechanical properties. Glass transition temperatures fell in the range of 290–330 °C as measured by differential scanning calorimetry, and initial decomposition temperatures under nitrogen were over 480 °C as measured by thermogravimetric analysis. Some polymer films showed outstanding tensile strength (over 150 MPa) and moduli (up to 5 GPa). The presence of benzimidazole rings in the current polyamides greatly enhanced their hydrophilicity in comparison with classical wholly aromatic polyamides; thus, although aromatic polyamide films normally show water sorption values of only 4–8%, some of the current poly(benzimidazole amide)s show water sorption up to 19% in a 65% relative humidity atmosphere. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7566–7577, 2008 |
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Keywords: | benzimidazole heteroatom‐containing polymers high temperature materials hydrophilic polymers mechanical properties monomer synthesis monomers polyamides properties water sorption |
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