Synthesis of polyether-based block copolymers based on poly(propylene oxide) and terephthalates


Schuur, Martijn van der and Feijen, Jan and Gaymans, Reinoud J. (2005) Synthesis of polyether-based block copolymers based on poly(propylene oxide) and terephthalates. Polymer, 46 (2). pp. 327-333. ISSN 0032-3861

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Abstract:Poly(propylene oxide) (PPO) is a low reactive telechelic polyether and the synthesis of high molecular weight poly(propylene oxide)-based block copolymers was studied. The poly(propylene oxide) used was end capped with 20 wt % ethylene oxide and had a molecular weight of 2300 g/mol (ultra-low monol PEO-b-PPO-b-PEO). The type of terephthalic acid based precursors was varied: terephthalic acid, dimethyl terephthalate, diphenyl terephthalate, di(trifluoro ethyl) terephthalate, di(p-nitrophenyl) terephthalate) and terephthalic acid chloride. High molecular weight poly(propylene oxide) based segmented block copolymers were obtained with diphenyl terephthalate (inherent viscosity: 1.6 dl/g).

The synthesis of polyether(ester–amide)s comprising PPO and isophthalamide-based segments was also studied by varying the polymerization temperature and time. High molecular weight poly(propylene oxide) block copolymers could be obtained if the reaction was carried out for 2 h at 250 °C under vacuum. Higher temperatures (280 °C) and longer times result in lower inherent viscosities, probably due to degradation of the polyether.
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Copyright:© 2005 Elsevier
Science and Technology (TNW)
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