VASILICA POPESCU,IRINA CRINA ANCA SANDU, GABRIEL POPESCU, ALEXANDRU POPA, CEZAR DORU RADU<br>Colorimetric Answer of Monochlorotriazinyl-beta- cyclodextrin Grafted onto PAN Support Chemical Modified with NaOH and Amines

VASILICA POPESCU,IRINA CRINA ANCA SANDU, GABRIEL POPESCU, ALEXANDRU POPA, CEZAR DORU RADU
Colorimetric Answer of Monochlorotriazinyl-beta- cyclodextrin Grafted onto PAN Support Chemical Modified with NaOH and Amines

Abstract:

The acrylic fibre Melana (a ternary copolymer, AN + AV + aMS abbreviated as PAN) was pretreated with NaOH ± amine. The effects caused by these pretreatments have a chemical nature (at AV and AN comonomers level) and were investigated. The results show that after the pretreatments with amines (in presence of NaOH), the acrylic fibre undergoes chemical changes, acquiring OH, COOH groups or amides and hydroxamic acids. Monochlorotriazinyl-b-cyclodextrin (abbreviated with - CD) grafting on functionalized acrylic support determined new chemical modifications. All the modifications occured by PAN are demonstrated by qualitative analysis (FTIR, SEM) and by quantitative analysis (EDAX, tinctorial method). The tinctorial method can be used to confirm the chemical modification of PAN functionalized with amines and grafted with CD, only if it is carried out with another class of dyes (reactive dyes), different from the specific dye class (cationic dyes). The tinctorial answer to these transformations is revealed by colour strength values K/S obtained after dyeing with three reactive dyes: Procion red H-E3B, Procion Red H-EXL and Procion Brilliant Red H-EGXL. The obtained values of K / S are dependent on the amine type used in functionalization stage but also on the parameters of dyeing with reactive dyes (concentration, pH, temperature, duration, and amine type). Keywords: polyacrylonitrile fibre, monochlorotriazinyl-b-cyclodextrin, reactive dyes, dyeability

Issue: 2015, Volume 66, Issue 11

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