Study on melting and polymorphic behavior of poly(decamethylene terephthalamide)

Journal article (2019)

Authors

M. LI Novel Aerospace Materials - Aerospace Engineering , Nanjing Tech University, Dutch Polymer Institute
Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
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Published Date

15-04-2019

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract


This work describes the melting and polymorphic behavior of poly(decamethylene terephthalamide) (PA 10T). Both solution-crystallized (SC) and melt-crystallized (MC) PA 10T show double melting endotherms in DSC. The SC crystal form melts at 260–300°C giving the first melting endotherm, and meanwhile undergoes a polymorphic transition forming the MC crystal form. The subsequent melting of the MC crystal form gives the second melting endotherm at 300–325°C. This irreversible polymorphic transition is confirmed by variable-temperature WAXD and IR. Dynamic mechanical thermal analysis (DMTA) shows a glass transition temperature (T
g
) at 127°C and the presence of an α′ transition at 203°C (0.1 and 1 Hz). This transition could be confirmed by DSC and variable-temperature WAXD experiments. The α′ transition correlates with a reversible thermal process and a sudden change in intersheet spacing.

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