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Sunday, 15 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Functions stick on the surface of polymers

Thursday, 30 May 2013

Reacting on stimuli from outside, that is what hyperbranched polymers do with a functionalised surface. This opens new fields of applications for this kind of polymer architecture.

Researchers synthesised imidazole-terminated hyperbranched polymers with POSS-branching

Source: Evonik Röhm GmbH

Researchers synthesised imidazole-terminated hyperbranched polymers with POSS-branching

Source: Evonik Röhm GmbH

Hyperbranched polymers have synthetic advantages over dendrimers and are usually prepared via one-pot synthesis leading to products with distribution in molar mass and branching.

Researchers prepared imidazole-terminated hyperbranched poly(amidoamine)s with POSS-branching units. The pH titrations showed well-defined one-step titration curves suggesting the terminal functional groups inhibited association with neighboring branches.

Polymerisation of Tris-amine and POSS-core dendrimers

Yasuyuki Irie and Kensuke Naka, from Kyoto Institute of Technology in Japan, prepared prepared an imidazole-terminated hyperbranched polymer with octafunctional POSS branching units denoted as POSS-HYPAM-Im. The researchers polymerised therefore excess amounts of tris(2-aminoethyl)amine with the first-generation methyl ester-terminated POSS-core poly(amidoamine)-typed dendrimer, reacting with methyl acrylate, and ester-amide exchange reaction with 3-aminopropylimidazole.

The imidazole-terminated hyperbranched poly(amidoamine) denoted as HYPAM-Im was also synthesized with 1-(3-aminopropyl)imidazole from a methyl ester-terminated hyperbranched poly(amidoamine) by the ester-amide exchange reaction.

Transmittance decreased, and variations of coordination modes came up

The transmittance of the POSS-HYPAM-Im solution drastically decreased when the solution pH was greater than 8.2. On the other hand, the transmittance of the HYPAM-Im solution gradually decreased when the solution pH at 8.5 and was greater than 9. Spectrophotometric titrations of the hyperbranched polymer aqueous solutions with Cu2+ ions indicated the variation of the coordination modes of POSS-HYPAM-Im from the Cu2+–N4 complex to the Cu2+–N2O2 complex and the existence of the only one complexation mode of Cu2+–N4 between Cu2+ ion and HYPAM-Im with increasing the concentrations.

Hyperbranched polymers well known for coatings

Hyperbranched polymers are highly branched macromolecules with three-dimensional dentritic architecture. Due to their unique physical and chemical properties and potential applications in various fields from drug-delivery to coatings.
They are the fourth major class of polymer architecture, coming after traditional types which include linear, cross-linked and branched architectures.

This research will be published in the Journal of Polymer Science Part A: Polymer Chemistry, Volume 51, Issue 12, pages 2695–2701

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