Deformation-Induced Color Changes in Melt-Processed Polyamide 12 Blends

作者：Lavrenova Anna; Holtz Adrien; Simon Yoan C; Weder Christoph^*

来源：Macromolecular Materials and Engineering, 2016, 301(5): 549-554.

DOI：10.1002/mame.201500403

• fluorescent polymer
• mechanochromic material
• oligo(p-phenylene vinylene)
• polyamide 12
• sensors

Blends of polyamide 12 and small amounts (0.15-1 wt%) of the excimer-forming fluorescent dye 1,4-bis(alpha-cyano-4-octadecyloxystyryl)-2,5-dimethoxybenzene (C18-RG) are produced by melt-processing. While green monomer fluorescence from well-individualized chromophores is observed at low dye concentration (0.15%), higher dye concentrations lead to aggregation of the dye so that the emission characteristics are dominated by red excimer fluorescence. Upon mechanical deformation of samples with appropriately selected dye content (0.25 wt%), a pronounced mechanochromic effect can be observed, which manifests itself through a mechanically induced transformation from excimer-dominated to monomer-rich emission. The monomer to excimer emission ratio I-M/I-E is increased by a factor of up to 2 in a step-wise manner when samples are uniaxially deformed past the yield point.

• 出版日期2016-5