By Martin D. Hager, Sybrand van der Zwaag, Ulrich S. Schubert

The sequence Advances in Polymer technology provides serious experiences of the current and destiny developments in polymer and biopolymer technological know-how. It covers all parts of study in polymer and biopolymer technological know-how together with chemistry, actual chemistry, physics, fabric technology. The thematic volumes are addressed to scientists, even if at universities or in undefined, who desire to hold abreast of the $64000 advances within the lined issues. Advances in Polymer technology enjoys a longstanding culture and reliable attractiveness in its neighborhood. every one quantity is devoted to a present subject, and every overview significantly surveys one point of that subject, to put it in the context of the quantity. The volumes in most cases summarize the numerous advancements of the final five to ten years and talk about them severely, featuring chosen examples, explaining and illustrating the $64000 rules, and bringing jointly many vital references of basic literature. On that foundation, destiny examine instructions within the quarter will be mentioned. Advances in Polymer technology volumes therefore are vital references for each polymer scientist, in addition to for different scientists attracted to polymer technology - as an advent to a neighboring box, or as a compilation of special details for the expert. assessment articles for the person volumes are invited through the quantity editors. unmarried contributions will be in particular commissioned. Readership: Polymer scientists, or scientists in comparable fields attracted to polymer and biopolymer technology, at universities or in undefined, graduate students

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However, the pKa of the boronic acid can be tuned by the addition of various substituents, so that this reversible covalent bond can be applied over a large range of pH values. Jay et al. reported a pH-responsive polymeric network crosslinked through boronate–diol complexes with self-healing properties [134]. For this purpose, a 10 mol% phenyl boronic acid (PBA)-functionalized poly(2-hydroxypropylmethacrylamide) [poly(HPMAm)] and a 1 mol% salicylhydroxamic acid (SHA)functionalized poly(HPMAm) were synthesized and mixed with each other, resulting in a covalent crosslinked network across the entire pH range.

After 24 h the two cut pieces were reconnected and this process could be repeated three times. A new biocompatible polysaccharide-based self-healing hydrogel was reported by Wei et al. [106]. The reversible imine and acylhydrazone bonds were introduced into the hydrogel networks by the reaction of N-carboxyethyl chitosan and adipic acid dihydrazide with oxidized sodium alignate. The self-healing ability was investigated by rheological recovery tests, macroscopic self-healing experiments, and beam-shaped strain compression measurements.

27 Repeated self-healing of crossed ruptured specimen of a polyurethane with reversible alkoxyamine units (Reproduced from [124]. Copyright 2015 Elsevier) 46 N. Kuhl et al. NCO HO N OH O O HO n NCO PEG2000 N IPDI H CTPO H N O O n O H N O O N O O N ICPEG2000 Scheme 17 Synthesis of the reversible polyurethane ICPEG2000 (see text for details). Adopted from [126] Zhang et al. reported an alkoxyamine-crosslinked polyurethane that was capable of autonomous healing at ambient temperatures [126]. Therefore, an alkoxyamine derivative, 5-hydroxy-2-(4-hydroxy-2,2,6,6-tetramethylpiperidin-1-yloxy)-2-methyl pentane-nitrile (CTPO), was synthesized.

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