Luminescent grafted polymers containing pyrene and other photoactive chromophores
Universidad Nacional Autónoma de México (UNAM), Mexico
Friday, July 27, 2018
C2 361 (Reading Room)
Host: Jean Duhamel
Abstract: Novel grafted polymers were prepared from commercial low-density polyethylene (PE) films. Firstly, precursor polymers were synthesized by reacting PE in the presence of acryloyl chloride (AC), using gamma radiation at different radiation doses, to give precursor the grafted polymer (PE-g-AC). This intermediate polymer, which contain acid chloride groups, can be easily esterified in the presence of a large variety of chromophores having terminal OH groups in their structure to give the desired photoluminescent polymers (PE-g-AC-Chromophore). In this way, we have incorporated different pyrene derivatives such as 1-pyrenebutanol, 1-pyrenemethylamine and a pyrene derivative containing a PEG segment onto PE films. Similarly, a new porphyrin derivative bearing a tetraethylene glycol side chain has been also linked to PE films via grafting. At last have also grafted two matlanine derivatives, water soluble natural fluorescent chromophores extracted from the Mexican plant "palo azul", to PE films. All the polymers were characterized by FTIR spectroscopy and their thermal behaviour was studied by TGA and DSC. The optical properties of the polymers were studied by absorption and fluorescence spectroscopy. In addition, the influence of the irradiation dose on the structure and the optical properties of the polymers is discussed in detail.