In dependence on crystallization conditions three ranges with different crystal structure and heat of fusion were found by DSC,WAXS,and IR for unoriented PA 6.6 samples of densities between 1.10 and 1.17gcm−3: Range I:αI triclinic, ρ c I =1.225 gcm−3,ΔH M I = 235 Jg−1. Range II:αII triclinic,ρ c II =1.165 gcm−3, ΔH M II =185 Jg−1. Range III:Continuous variation from ρ c I ,ΔH M I to ρ c II , ΔH M II . ρa=1.095 gcm−3 is independent of crystallization. conditions. The transition between αI and αII is probably due to changes of the chain conformation.
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Haberkorn, H., Illers, K.H. & Simak, P. Calorimetric, X-ray and infra-red investigations on poly(hexamethylene adipamide). Polymer Bulletin 1, 485–490 (1979). https://doi.org/10.1007/BF00255713
- Crystal Structure
- Continuous Variation
- Material Processing