| abstract |
The invention relates to a block copolymer comprising: at least one rigid block A having a Tg> 0 degrees C, advantageously> 60 degrees C, preferably> 80 degrees C, and. at least one block B comprising at least one photoactive monomer carrying a photoisomerizable chromophore.The photoactive monomer preferably has the formula (I): embedded image in which: X is H or CH3-; G denotes -OC (= O) -, -C (= O) -O-, a substituted or unsubstituted phenyl group, or -NR-C (= O) -, NR being connected to L and R being H or a C1-C10 alkyl group; L denotes a spacer group; CR denotes a photoisomerizable chromophore.The block copolymer makes it possible to obtain a 3D optical memory. The invention also relates to this 3D optical memory. |