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Direct coloration of textiles with photochromic dyes. Part 2: The effect of solvents on the colour change of photochromic textiles †
Author(s) -
Billah Shah M Reduwan,
Christie Robert M,
Morgan Keith M
Publication year - 2008
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2008.00146.x
Subject(s) - photochromism , solvation , textile , ultraviolet , polyester , photochemistry , chemistry , irradiation , materials science , organic chemistry , composite material , solvent , optoelectronics , physics , nuclear physics
Polyester, acrylic and nylon textile substrates dyed with two spirooxazine dyes, 1,3,3‐trimethyl‐spiroindoline‐2,3′‐3 H ‐naphth[2,1‐ b ][1,4]oxazine ( 1a ) and 6′‐piperidino‐1,3,3‐trimethyl spiroindoline‐2,3′‐3 H ‐naphth[2,1‐ b ][1,4]oxazine ( 1b ), exhibit significantly higher photochromic colour build‐up when wet compared with after drying. A study of this phenomenon, extended beyond water to the influence of a series of selected organic solvents on photochromic behaviour, using colour measurement of the photochromic textiles under controlled ultraviolet irradiation conditions, is reported. The results of molecular modelling calculations (AM1 in water and PM5 in water) have been used as a means of interpreting the observed effects, in conjunction with qualitative arguments based on solvation and fibre swelling.