Using the solubility parameter to explain disperse dye sorption on polylactide

Abstract

ABSTRACT:The solubility parameters of polylactide (PLA), poly(ethylene terephthalate) (PET), and various disperse dyes calculated according to the group contribution method were used to explain the low sorption of some disperse dyes on PLA but the high sorption of the same dyes on PET. It was found that the dyes with high sorption on PLA tended to have solubility parameters near that of PLA, which has a lower solubility parameter than that of PET. It was also found that the solubility parameter, which was calculated based on cohesive energy and molar volume at 25°C, was more appropriate for explaining dyeings at lower temperature, 100 and 110°C, than those at higher temperature, 130°C. Based on the finding that dyes with solubility parameters near that of PLA tend to have high sorption on PLA, general structures for disperse dye that may have high sorption on PLA were proposed.

Electrospun scaffolds of polylactide with a different enantiomeric content and loaded with anti-inflammatory and antibacterial drugs

“…The main problem was to choose a solvent based on the chloroform-acetone mixture able to dissolve 10% (w/v) of PLA and the two selected drugs with solubility characteristics different from those of PLA. Note the large difference between Hildebrand parameters reported for PLA 32 ). Finally, drugs were dissolved in dimethyl sulfoxide and subsequently added to the former PLA solution to obtain a tricomponent solvent mixture (chloroform:acetone:DMSO 6:3:1 v/v/v) compatible with the selected concentrations of PLA (10% (w/v)), TCS (3% (w/v)) and KTP (1% (w/v)).…”

“…This highly significant difference (p<0.001) was due to the large percentage of loaded TCS (i.e., 3% (w/v)), which became cytotoxic to cells in culture. 32 It is remarkable that a large percentage of adhesion was generally observed in dual drug-loaded scaffolds despite having the same TCS content. Only the PLA 2002D scaffold showed a slightly significant difference (borderline value with p<0.048).…”

Properties of materials as determined by inverse gas chromatography

“…Therefore, the solubility parameter and the Hansen solubility parameters are physicochemical parameters which enable estimation of type and interaction force, responsible for compatibility between materials. The solubility parameter and/or HSP can be applied in the description of the behavior of materials in real systems, including such phenomena as: miscibility, adhesion and wetting [49][50][51][52][53][54][55][56][57]. is focused on application of inverse gas chromatography for characterization of different materials.…”

A Study of the Effects of Time of Heat Setting and Wet Processes on Shearing (Gf/Cm) Properties of Treated and Untreated Griege Knitted Ingeo™ Poly (Lactic Acid) (Pla) and polyethyleneterepthalate (Pet) Fabric

“…When disperse dyes are treated with reducing agents, due to their azo group content, they are sensitive to treatment with a reducing agent usually in form of alkaline solution of sodium dithionite (hydros). The reducing agent destroys the azo chromophore, resulting to a loss of its color through the splitting of the azo chromophore into two colorless amino compounds [33][34][35][36] as shown in the Figure 4.…”

“…When properly treated PET fabric exhibits good dimensional stability, crease resistance and solvent resistance. PET when compared with other synthetic fabrics exhibits hydrophobicity and relative stability to chemicals and processing conditions [30][31][32][33][34][35]. At 65% r.h and 25°C, PET exhibits a good moisture regain of between 0.2-0.4%.…”