Being present for more than six decades, poly(2-oxazoline)s are in the lucky position to have grown older and wiser. As pseudo-polyamides, these (co-)polymers may be considered in numerous application fields such as high-voltage engineering as well as microelectronics. In such applications, (co-)poly(2-oxazoline)s can replace the well-established polyamides. One major advantage of poly(2-oxazoline)s is a combination of the facts that 2-oxazoline monomers can be polymerized in (pseudo-) living cationic ring-opening polymerizations and that numerous monomers can be synthesized from renewable resources. In more detail: The reaction of ethanol amine with carboxylic acids yields 2-oxazolines, e.g. 2-nonyl-2-oxazoline from decanoic acid (coconut oil) and 2-dec-9′-enyl-2-oxazoline from undec-10-enoic acid (castor oil). The corresponding copolymers such as poly(2-nonyl-2-oxazoline)-stat-poly(2-dec-9′-enyl-2-oxazoline) can be crosslinked with thiols.<br/>This lecture will detail the applicability of poly(2-oxazoline)s as insulators in high-voltage engineering and as additive in blends for the fabrication of polymer surfaces with tunable functionality: The permittivity, loss factor and conductivity of (densely) crosslinked copoly(2-oxazoline)s are in the same range as for polyamides; the complex permittivity, however, decreases with the network density. Hence, the usage of glycol dimercapto acetate (with hydrolyzable ester bonds) as crosslinker limits the applicability of such poly(2-oxazoline)-based resins as insulators to the corresponding composites with nano-scaled fillers, the so-called nanodielectrica (Figure 1). Copoly(2-oxazoline)s with a precisely defined number of alcohol and carboxylic acid functions can be obtained from polymeranalogous reactions of poly(2-oxazoline)s such as the thiol-ene reaction with hydroxyl-functionalized thiols and the hydrolysis of side-chain ester groups. Such copolymers can be blended with non-polar polymers such as polyolefins, yielding polymer surfaces with tailor-made polarity and enhanced adhesion towards other polymers.

Merging dielectric stability and ubiquitous adhesion: Poly(2-oxazoline)s in microelectronics and high-voltage engineering

2019 Spring National Meeting

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