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

The sequence Advances in Polymer technological know-how offers serious reports of the current and destiny developments in polymer and biopolymer technological know-how. It covers all components of analysis in polymer and biopolymer technological know-how together with chemistry, actual chemistry, physics, fabric technological know-how. The thematic volumes are addressed to scientists, even if at universities or in undefined, who desire to maintain abreast of the $64000 advances within the coated subject matters. Advances in Polymer technological know-how enjoys a longstanding culture and solid acceptance in its group. each one quantity is devoted to a present subject, and every assessment severely surveys one point of that subject, to put it in the context of the quantity. The volumes more often than not summarize the numerous advancements of the final five to ten years and speak about them severely, providing chosen examples, explaining and illustrating the real ideas, and bringing jointly many very important references of basic literature. On that foundation, destiny study instructions within the sector might be mentioned. Advances in Polymer technology volumes therefore are very important references for each polymer scientist, in addition to for different scientists drawn to polymer technology - as an creation to a neighboring box, or as a compilation of unique details for the professional. overview articles for the person volumes are invited by means of the amount editors. unmarried contributions might be especially commissioned. Readership: Polymer scientists, or scientists in comparable fields attracted to polymer and biopolymer technological know-how, at universities or in undefined, graduate students

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Adopted from [79] Self-Healing Polymers Based on Reversible Covalent Bonds 25 Fig. 13 Optical microscope images (left and middle) and corresponding SECM images (right) of the self-healing process: (a, d, g) Fractured surface before healing; (b, e, h) after 2 h, and (c, f, i) after 7 h of healing (Reproduced from [79]. Copyright 2015 Wiley-VCH Verlag GmbH & Co. KgaA) In contrast to the classical DA systems, fulvene and electron-poor dienophiles feature a much higher reversibility, resulting in exchange even at room temperature.

For this purpose, the authors synthesized two similar copolymers on the basis of poly(4-vinylbenzyl chloride) (PCMS) with two different alkoxyamine units [2,2,6,6-tetramethylpiperidinyl-1oxy (TEMPO) and 1-(1-phenylethoxy)-2,2,6,6-tetramethylpiperidin (TEMPOEOPh)] as pendent groups (Fig. 25). After that, PCMS-TEMPO/PCMSTEMPO-EOPh blends were prepared to check the self-healing ability through radical crossover reactions. First, a solution of PCMS-TEMPO/PCMS-TEMPOEOPh was heated to 125  C for 20 min, resulting in the formation of a gel and, thus, proving the occurrence of cross-reactions.

For this purpose, the authors prepared two different poly(urea-urethanes) and mixed them in a certain ratio to obtain a material with good elastomeric properties. This material, which contained Self-Healing Polymers Based on Reversible Covalent Bonds 37 Fig. 20 Monomer structure of epoxy resins EPS25 and EPS70 and crosslinkers 4-SH and 3-SH; see text for details. Adopted from [22] Fig. 21 (a) Self-healing of a polymer, based on disulfide exchange reactions monitored by an optical microscope. (b) Example of macroscopic cohesion recovery (Reproduced from [22].

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