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Whereas the self\u2010healing properties of this system were described previously, this report focuses on its response to different external stimuli, which is studied by quartz crystal microbalance analysis of thin films of the material. Reversible collapse with increasing temperature, reversible swelling with decreasing pH and irreversible shrinkage with UV exposure are demonstrated. These three stimuli are combined to have externally gated or tuned responses. Thermo\u2010induced swelling and shrinkage can be reversibly inhibited by changing the pH and irreversibly regulated by exposure to light of different doses. These materials represent the first general strategy to obtain responsive self\u2010healing hydrogels in which the response and the self\u2010healing properties are decoupled from each other and can be tuned independently.<\/jats:p>","DOI":"10.1002\/cphc.201300367","type":"journal-article","created":{"date-parts":[[2013,8,5]],"date-time":"2013-08-05T08:55:21Z","timestamp":1375692921000},"page":"2932-2938","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["2\u2010Ureido\u20104\u2010Pyrimidone\u2010Based Hydrogels with Multiple 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