Synthesis and properties of segmented copolymers having aramid units of uniform length


Niesten, M.C.E.J. and Feijen, J. and Gaymans, R.J. (2000) Synthesis and properties of segmented copolymers having aramid units of uniform length. Polymer, 41 (24). pp. 8487-8500. ISSN 0032-3861

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Abstract:Segmented copolymers consisting of crystallizable p-phenyleneterephthalamide ester units and poly(tetramethyleneoxide) segments were synthesized. The synthesis of the p-phenyleneterephthalamide ester starting material was optimized with respect to yield and purity. The polymers were synthesized via a solution/melt polymerization. The possibilities for a melt polymerization are also discussed. The length of the poly(tetramethyleneoxide) segment in the polymers was varied from 650 to 2900 g/mol. Also other types of low Tg segments were incorporated in the polymers: modified poly(tetramethyleneoxide) (methyl side groups), poly(oxyethyleneglycol) and poly(ethylene/butylene). The polymer properties were investigated with differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The polymers are fast crystallizing and the p-phenyleneterephthalamide units crystallize nearly completely. As a result the glass transition is sharp and low (−65°C), the rubbery plateau is temperature independent and the flow temperature is high. Polymers with poly(oxyethyleneglycol) have a high water uptake. Polymers with poly(ethylene/butylene) segments already phase separate during the polymerization inhibiting the formation of high molecular weight polymers.
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Copyright:© 2000 Elsevier Science
Science and Technology (TNW)
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