By Louisa Harding
Книга по вязанию на спицах от известного дизайнера Louisa Harding.Вней представлены модели из натуральной неокрашенной пряжи для детей и их мам.
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Extra resources for Natural Knits for Babies and Mums: Beautiful Designs Using Organic Yarns
Sample text
Pursuing this approach, new macromolecules with easier and more selective cleavable bonds were designed. 4 entry 3). In a similar approach a poly(phenylene ether) (PPE) chain can be cut by an external force as well as by heat or light. 7 Overview of mechanochemically induced self-healing systems. (a) The generation of radicals by polymer chain scission and the subsequent recombination, (b) the generation of reactive species by cleaving of highly strained ring systems under b(i) chain scission or b(ii) via subsequent pericyclic rearrangement, and (c) the mechanochemical activation of catalysts.
2 entry 17). For example, a poly(alkoxyamine ester) was developed which is able to undergo a reversible radical exchange reaction at 60 °C by homolytic cleavage of the C–O bond [147]. Thus, these systems reduced the destructive stress within the polymeric material and are potentially suitable for self-healing applications. 5j). In contrast to the previously discussed reversible self-healing concepts which are, at least theoretically, infinitely repeatable, polycondensations are limited in the number 28 1 Principles of Self-Healing Polymers of healing cycles due to the consumption of functional groups during the selfhealing process.
Thus, supramolecular multiblock copolymers as well as thermoreversible supramolecular polymer blends with tunable properties can be created. 3 entry 5). Due to immiscibility effects phase separation into a soft, supramolecular poly(acrylate amide) matrix and a hard poly(styrene) sphere could be observed. Accordingly, the approach combines elastomeric behavior, mechanical stiffness and molecular dynamics due to reversible hydrogen bonding within grafted brushes [94]. Due to the large number of hydrogen bonds, a number of promising but still unexploited hydrogen bonds as concepts for self-healing polymers exist.