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New Cyclic Olefin Copolymer for the Preparation of Thermally Responsive Luminescent Films
Author(s) -
Donati Filippo,
Pucci Andrea,
Boggioni Laura,
Tritto Incoronata,
Ruggeri Giacomo
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200800607
Subject(s) - copolymer , materials science , norbornene , glass transition , crystallinity , annealing (glass) , luminescence , polymer , polymer chemistry , olefin fiber , chromophore , thermoplastic , chemical engineering , composite material , photochemistry , optoelectronics , chemistry , engineering
Abstract Polymer films with optical properties as indicators to thermal stress were obtained through the controlled dispersion of moderate amounts (≤0.1 wt.‐%) of the 4,4′‐bis(2‐benzoxazolyl)stilbene (BBS) dye into a new semicrystalline ethylene‐norbornene ( E ‐ co ‐ N , N content of 15.3 mol.‐%) copolymer characterized by a glass transition temperature ( T g ) of about 64 °C. All the pristine films showed optical characteristics coming from noninteracting BBS chromophores. In contrast permanent optical changes were detected after film annealing at a T ≥ T g due to the variation of the BBS supramolecular structure. The easy modulation of the optical features of polymer films by thermal perturbations suggests applications as threshold temperature visual indicators in thermoplastic materials.