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Synthesis and characterisation of uniform bisester tetra-amide segments

✍ Scribed by J Krijgsman; D Husken; R.J Gaymans

Book ID
104163941
Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
287 KB
Volume
44
Category
Article
ISSN
0032-3861

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✦ Synopsis

The synthesis and characterisation of a new type of high melting and fast crystallising amide units that can be used for copolymerisation have been studied. These bisester tetra-amide or TxTxT-dimethyl segments (T is a terephthalic unit and x ¼ ðCH 2 Þ n ðn ¼ 2 -8Þ) can be synthesised in a two-step reaction. These segments are based on two-and-a-half repeating units of nylon-x,T. The structure of the products was confirmed by NMR. The melting temperature and enthalpy of xTx-diamine and TxTxT-dimethyl and -diphenyl were determined by DSC. The melting temperature increases with decreasing length of x. For odd x the melting temperature is lower. The melting temperature and enthalpy of the products decrease with decreasing purity.

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