Improving the photostability of curcumin using functional star-shaped polyamidoamine dendrimer: Application on PET

Three novel 2,4-dihydroxybenzophenone UV-absorber-containing compounds, 2,4-dihydroxybenzophenone-conjugated G0-PAMAM dendrimer-curcumin (D4), 2,4-dihydroxybenzophenone-conjugated G1-PAMAM dendrimer-curcumin (D5) and 2,4-dihydroxybenzophenone-conjugated G2-PAMAM dendrimer-curcumin (D6) were synthesized from reactant cyanuric chloride via coupling to PAMAM (G0,G1,G2) as well as curcumin. Chemical structures of newly prepared materials were proved by means of elemental analysis, FTIR, (HNMR)-H-1, (CNMR)-C-13, UV-vis and DSC techniques. The spectral features of D4-D6 were studied in comparison with those of unmodified curcumin. The novel 2,4-dihydroxybenzophenone UV-absorber-containing compounds exhibited a narrow peak at 420-440 nm with high molar extinction coefficient. To study their dyeing features and the obtainable color gamut, synthesized compounds were used in the high temperature dyeing of polyethylene terephthalate (PET) fabrics and their light fastness was also evaluated. The outcomes revealed that the building-up and light fastness of new dyes were considerably developed.