Photo-controlled Growth of Telechelic Polymers and End-linked Polymer Gels


  • We thank E.-M. Schoen for helpful discussions. We also thank the MIT Department of Chemistry and the American Chemical Society Petroleum Research Fund for support of this work.


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Growing pores: Exposure of a bis-norbornene trithiocarbonate to long-wavelength UV light, or sunlight, in the presence of N-isopropylacrylamide (NiPAAm) led to well-defined norbornene–telechelic poly(NiPAAm) macromers. The macromers were end-linked with a tris-tetrazine via inverse-electron-demand Diels–Alder cycloaddition to generate polymer gels. Addition of new monomer, followed by exposure to sunlight, led to “photo-growth” of the network pores.