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Rheological Properties of Concentrated Solutions of Aliphatic Hyperbranched Polyesters

✍ Scribed by Jasna Vuković; Manfred D. Lechner; Slobodan Jovanović

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
203 KB
Volume
208
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The rheological investigation of concentrated solutions of aliphatic hyperbranched polyesters (AHBP) in N‐methyl‐2‐pyrrolidinon (NMP) is presented. Two series of hydroxy‐functional AHBP were synthesized using pseudo‐one‐step and one‐step procedure. Three commercial (Boltorn®) AHBP were also investigated. In the examined temperature region (10–50 °C), AHBP solutions (c ≤ 45 wt.‐%) exhibited Newtonian behavior. The same was observed for 50 and 55 wt.‐% solutions at T ≥ 40 °C. However, at T < 50 °C, solutions of AHBP of higher concentrations (50 and 55 wt.‐%) showed shear thinning behavior. Values of the flow activation energies were calculated for all examined AHBP. The influence of the procedure for the synthesis, concentration and temperature on rheological behavior of AHBP solutions in NMP is discussed.

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✍ Ema Žagar; Miroslav Huskić; Majda Žigon 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 274 KB

## Abstract We investigated the effects of annealing on the rearrangement of the H‐bond network microstructure and its influence on the thermal and rheological properties of the second pseudo‐generation hyperbranched (HB) polyester based on 2,2‐bis(methylol)propionic acid (Boltorn H20) in compariso