共查询到20条相似文献,搜索用时 150 毫秒
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(18):5122-5126
Despite a growing interest in two‐dimensional polymers, their rational synthesis remains a challenge. The solution‐phase synthesis of a two‐dimensional polymer is reported. A DNA‐based monomer self‐assembles into a supramolecular network, which is further converted into the covalently linked two‐dimensional polymer by anthracene dimerization. The polymers appear as uniform monolayers, as shown by AFM and TEM imaging. Furthermore, they exhibit a pronounced solvent responsivity. The results demonstrate the value of DNA‐controlled self‐assembly for the formation of two‐dimensional polymers in solution. 相似文献
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Satoshi Honda Minami Oka Hideaki Takagi Taro Toyota 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(1):150-154
Repeatable topological transformation of polymers for the modulation of material functions is a challenge. We have developed a method for repeatedly resetting a cyclic macromolecular architecture to a linear architecture by photostimulation, namely, topology‐reset execution (T‐rex) based on the photochemistry of hexaarylbiimidazoles (HABIs). We synthesized cyclic poly(dimethylsiloxane)s (PDMSs) of various ring sizes with HABIs linked in the chains. UV irradiation of the cyclic PDMSs produced telechelic linear PDMSs with triphenylimidazolyl radical (TPIR) end groups. After termination of UV irradiation, end‐to‐end recyclization occurred by the recoupling of TPIRs. The cyclic PDMSs also responded to ultrasound, which decreased their molecular weight (MW) by site‐specific cleavage of in‐chain HABI moieties, and we are able to reset the MWs by subsequent phototriggered T‐rex. Furthermore, T‐rex enabled solvent‐free switching of the rheological properties of the materials while retaining the liquid character of PDMS. 相似文献
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David Schaffert Christina Troiber Eveline E. Salcher Thomas Frhlich Irene Martin Naresh Badgujar Christian Dohmen Daniel Edinger Raphaela Klger Gelja Maiwald Katarina Farkasova Silke Seeber Kerstin Jahn‐Hofmann Philipp Hadwiger Ernst Wagner 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2011,123(38):9149-9152
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