Crystalline transition in Nylon 10 10

Variable-temperature X-ray diffraction is used to monitor the crystalfine transition of Nylon 10 10. It could be found that the α-phase of the sample transforms into a γ-phase at about 135°C, if the sample is heated from room temperature to a high temperature which is the sit-called Brill transition of Nylon 10 10, In addition. Nylon 10 10 was found to crystallize directly in t kind of o-phase from the melt at high temperature which is much different from the behavior of Nylon 66 and Nylon 10 12, Upon further cooling to room tempera ture, Nylon 10 10 preserved the α-phase revealing two peaks in its XRD patterns. However, if the Nylon 10 10 mple with γ-form was not melted, but immediately cooled from a temperature between T B and T m , the reverse transition from γ-form to α-form could be observed at about 130°C, indicating reversible Brill transition of Nylon 10 10.