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• W2013072092 abstract "drawbacks, such as slow gelation rate, need for potentially toxic initiators, and thermal or storage instability. In addition, a limited number of these photoinduced systems demonstrate photoreversibility. [2,3,9,10] Andreopoulos et al. [3] have synthesized a partially reversible hydrogel via photopolymerization of cinnamylidene-terminated PEG. The physical properties of the hydrogel membrane such as pore size and swellability were controlled in a predictive way by alternating the wavelength (>300/254 nm) and sequence of irradiation. The photoreversibility efficiency of the PEG-cinnamylidene hydrogel, however, was compromised by photoscission light inefficiency, cinnamylidene photodegradation, and side polymerization reactions. [10] In the work reported here, we designed a new photocrosslinked and photoscissile hydrogel based on an eight-branched PEG with nitrocinnamate as pendant groups. Cinnamate is known to undergo trans‐cis isomerization and [2+2] cycloaddition upon UV irradiation at wavelengths longer than 290 nm, and the formed cyclobutane ring can be cleaved to regenerate the starting cinnamate groups at wavelengths below 260 nm. [11] The photocrosslinking property of cinnamates has been broadly utilized in the field of photolithography and the semiconductor industry. [12] However, the application of nitrocinnamate photoreactivity in PEG chemistry, especially in PEG-based hydrogel formation, has rarely been reported. [6,13] On the other hand, cinnamate derivatives possess excellent thermal and storage stability superior to cinnamylidene systems. [14] PEG-cinnamylidene polymers have been shown to be unstable and undergo gelation when they are kept at room temperature for a period of a few weeks. Nitrocinnamate demonstrates the stability characteristics of the unsubstituted cinnamate and at the same time is 350 times more photoreactive. [11,15]" @default.
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• W2013072092 date "2001-02-01" @default.
• W2013072092 modified "2023-10-17" @default.
• W2013072092 title "A Novel Photoscissile Poly(ethylene glycol)-Based Hydrogel" @default.
• W2013072092 doi "https://doi.org/10.1002/1616-3028(200102)11:1<37::aid-adfm37>3.0.co;2-v" @default.
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