A Simply Synthesized, Tough Polyarylene with Transient Mechanochromic Response
作者： Fabian Kempe , Oliver Brügner , Hannah Buchheit , Sarah N. Momm , Felix Riehle
关键词: Covalent bond 、 Spiropyran 、 Molar mass 、 Nitro 、 Materials science 、 Comonomer 、 Merocyanine 、 Copolymer 、 Polymer chemistry
摘要: A simple, straightforward and high-yielding route to tough polyarylenes of type poly(meta,meta,para-phenylene) (PmmpP) is developed. PmmpP already in its as-synthesized state at intermediate molar mass Mw ~60 kg/mol exhibits outstanding mechanical properties for further optimized molecular weight (Mw = 96 kg/mol, E 0.9 GPa, e 300 %). Statistical copolymers with para,para spiropyran (SP) are mechanochromic, whereby the behavior allows investigate mechanochromism. Strained samples instantaneously lose color upon force release. DFT calculations show this phenomenon be caused by i) matrix that build-up sufficiently large forces transduced SP, ii) relatively unstable corresponding merocyanine (MC) form arising from aromatic comonomer. MC units covalently incorporated into a drastically reduced half life time 3.1 s compared 4.5 h obtained SP derivatives common 6 nitro substitution.
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