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Cover Image, Volume 137, Issue 5
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48613
Subject(s) - photopolymer , cover (algebra) , shadow (psychology) , cationic polymerization , polymerization , polymer science , computer science , volume (thermodynamics) , citation , computer graphics (images) , polymer , materials science , physics , library science , composite material , polymer chemistry , psychology , engineering , mechanical engineering , quantum mechanics , psychotherapist
Cationic active centers possess mobility through reactive diffusion and lead to polymerization in unilluminated regions (shadow cure). Shadow cure may allow effective photopolymerization in optically thick and pigmented systems or for systems in which areas are effectively masked from the illumination source, expanding potential applications for photopolymerization. The cover image, provided by Sage Schissel, demonstrates the potential for shadow‐cure growth in complex geometries. Here, the sample was only exposed to initiating light in a central 6 mm‐diameter, circular exposure area. Over time, cationic active centers diffused symmetrically into unilluminated areas of the mold, polymerizing the complete 25 mm‐diameter star shape. DOI: 10.1002/app.48290