Characterization of Polyammides

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• Characterization of Polyammides

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3 methods

• Infrared Spectroscopy
• Differential Scanning Calorimetry
• Dynamic Mechanic Analysis

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Infrared Spectroscopy

• We send an infrared beam on the sample
• The radiation will be attenuated only at specific
  wavelenghts
• The graph is called Spectrum and is a
  fingerprint of every molecule

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PA 6
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PA 6,6
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Overlay of PA 6 and 6,6
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Differential Scanning Calorimetry
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DSC of PA 6
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StepScan DSC of Nylon

• Nylon 6 polymers yield simultaneous moisture
  evolution peak and plasticized Tg
• Standard DSC has difficulty detecting plasticized
  Tg because of moisture peak
• StepScan DSC can separate out the moisture
  evolution peak (slow process) from the Tg
  (fast)

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StepScan DSC of Ambient Humidity Nylon 6 Fibers
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StepScan DSC of Saturated Nylon 6 Fibers
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StepScan DSC of Dry Nylon 6 Fibers
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Dynamic Mechanic Analysis
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A typical DMA curve...
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PA 6
Moisture effect on DMA of PA 6 and 12
PA 12
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Frequency effect on Modulus

• PMMA (0.01100Hz)

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ABCDT