Abstract
Melt condensation of dipropyl 5-(hydroxyethoxy) isophthalate (1) and 5-hydroxyethoxy isophthalic acid (2) gave two soluble alkylaryl hyperbranched polyesters (defined as P1 and P2, respectively). Longer reaction time gave P2 with higher intrinsic viscosity and lower solubility in various solvents. Comparing the thermal properties of P1 with that of P2, it was shown that Tg and Td were mainly depended on end-groups rather than molecular weight. Solid P2 formed from the melting state was composed of fine particles as observed by scanning electron microscopy (SEM). Ionized P2 was used as polyanion to form a self-assembled film with polycationic poly(diallydimethylammonium chloride) (PDAC) by layer-by-layer dipping. The layer formed from ionized P2 was observed by atomic force microscopy (AFM). Hyperbranched macromolecules thus formed spherical particles with uniform dimension. Particle size was 100–225 nm with average particle size of 140 nm in the self-assembled film. P2 was a more effective rheology modificator for processing polycarbonate than P1.
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Tang, LM., Qiu, T., Tuo, XL. et al. Synthesis, Morphology and Application of Alkylaryl Hyperbranched Polyesters. Polym J 34, 112–116 (2002). https://doi.org/10.1295/polymj.34.112
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DOI: https://doi.org/10.1295/polymj.34.112
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