Segmented block copolymers with polyesteramide blocks of uniform length: synthesis


Gaymans, R.J. and Haan, J.L. de (1993) Segmented block copolymers with polyesteramide blocks of uniform length: synthesis. Polymer, 34 (20). pp. 4360-4364. ISSN 0032-3861

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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.
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Copyright:© 1993 Elsevier Science
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