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The development of mechanophores with multi\u2010triggered response is of great interest. Herein, Diels\u2010Alder (DA) adducts are incorporated into linear poly(methyl acrylate) PMA\u2010BA and network poly(hexyl methacrylate) (PHMA) as mechanophores to detect the stress caused by ultrasound, freezing, and compression. The DA mechanophores undergo retro\u2010DA reaction to release 9\u2010styrylanthracene chromophore upon applying force, resulting in cyan fluorescence. The dissociation ratio of the DA mechanophore after pulsed ultrasonication of PMA\u2010BA solution for 240 minutes is estimated to be 52\u2009% by absorption spectra and <jats:sup>1<\/jats:sup>H NMR. Additionally, the rate constant of mechanical cleavage is calculated to be 1.2\u00d710<jats:sup>\u22124<\/jats:sup>\u2005min<jats:sup>\u22121<\/jats:sup>\u22c5kDa<jats:sup>\u22121<\/jats:sup> with the decrease in molecular weight from 69 to 22\u2005kDa measured by gel permeation chromatography. Freezing of PHMA gels as well as compression of PHMA bulk samples turn\u2010on the DA mechanophores, revealing the microscale fracture. Photon upconversion responses toward various force stimuli are also achieved in both polymer solutions and bulk samples by doping platinum octaethylporphyrin (PtOEP) or palladium meso\u2010tetraphenyltetrabenzoporphyrin (PdTPTBP) sensitizers with multiple excitation wavelengths.<\/jats:p>","DOI":"10.1002\/asia.202301147","type":"journal-article","created":{"date-parts":[[2024,2,9]],"date-time":"2024-02-09T05:39:25Z","timestamp":1707457165000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Multiple Force\u2010Triggered Downconverted and Upconverted Emission in Polymers Containing Diels\u2010Alder Adducts"],"prefix":"10.1002","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9025-8598","authenticated-orcid":false,"given":"Guohua","family":"Zhu","sequence":"first","affiliation":[{"name":"Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry 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