Segmented block copolymers with polyesteramide blocks of uniform length: synthesis

R.J. Gaymans, J.L. de Haan

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Abstract

Segmented copolymers were synthesized from poly(tetramethylene oxide) with hydroxy end-groups or aliphatic diols and a short-chain diester diamide with a uniform length. The diester diamide (N,N'-bis(p-carbomethoxybenzoyl)butanediamine) (Tm = 257°C) used is made from butanediamine and an excess of dimethyl terephthalate. The polymers are prepared in the melt with Ti(OCH3H7)4 as catalyst, for 30 min at 160-170°C under atmospheric pressure and 60 min at 250-260°C under a high vacuum. The polymers were studied by solution viscometry, differential scanning calorimetry and dynamic mechanical thermal analysis. The melting and glass transition temperatures decreased with increasing soft-block length. The crystalline order of the uniform unit is high and not very dependent on the soft-block length. The rate of crystallization is very fast. The moduli of these polymers are hardly dependent on temperature in the region between Tg and Tm.
Original languageEnglish
Pages (from-to)4360-4364
Number of pages5
JournalPolymer
Volume34
Issue number20
DOIs
Publication statusPublished - 1993

Keywords

  • Segmented copolymers
  • Poly(tetramethylene oxide)
  • Uniform unit length
  • Poly(ester amide)
  • Butaoediamine
  • Dimethyl terephthalate

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