Synthesis and Characterization of Recycled TPA-Derived Cation Dyeable Polyester
Vol. 63, No. 1, pp. 30-38,
Feb. 2026
10.12772/TSE.2026.63.030
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Abstract
In this study, cationic dyeable polyester (CDP) was synthesized using recycled terephthalic acid (r-TPA) recovered from waste PET, and its properties were comparatively analyzed with those of CDP synthesized from virgin terephthalic acid (v-TPA) in terms of chemical structure, molecular weight, thermal behavior, and dyeing performance. The results confirmed that r-TPA possesses an identical chemical structure and high purity to v-TPA, as verified by ¹H-NMR and FT-IR analyses. In addition, both v-CDP and r-CDP synthesized with varying contents of sodium dimethyl 5-sulfoisophthalate (DMS) exhibited comparable molecular weight levels and molecular weight distribution characteristics, including Mn, Mw, and PDI, indicating negligible differences in polymerization behavior depending on the raw material source. Differential scanning calorimetry (DSC) analysis revealed that increasing DMS content commonly led to decreases in the glass transition
temperature, melting temperature, and degree of crystallinity for both v-CDP and r-CDP. Furthermore, dyeing performance evaluations demonstrated that both CDPs showed enhanced dyeability and washing fastness with increasing DMS content. Overall, v-CDP and r-CDP exhibited equivalent chemical, molecular, thermal, and dyeing properties under identical synthesis conditions, demonstrating that r-TPA has commercial competitiveness comparable to that of virgin raw materials for CDP synthesis.
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