Poly(lactic acid) (PLA) is the first melt‐processable, renewable, sustainable and biodegradable natural‐based synthetic fibre. It has a broad range of uses and combines ecological advantages with outstanding performance in textiles. PLA fibre, as an aliphatic polyester, can be dyed with disperse dyes. Apart from the limited number of commercial disperse dyes, disperse dye exhaustion on PLA is generally lower than that on poly(ethylene terephthalate) (PET). In this study, new heterocyclic disazo disperse dyes, substituted with methyl, nitro and chloro groups at their ortho‐, meta‐ and para‐ positions, synthesised in our previous study, were applied to PLA and PET fibres to examine their dyeing performance, and colour fastness and dye exhaustion properties. Different shades of yellow, orange, reddish brown and brown were obtained. Most of the synthesised novel heterocyclic disazo disperse dyes exhibited good build‐up properties with high K/S levels on both fibres. Para‐ bonding substituent provided higher K/S values than meta‐ and ortho‐ positions for –NO₂ and –Cl substituents for both fibres. Overall, the most synthesised novel heterocyclic disazo disperse dyes in this study exhibited good build‐up properties with high K/S, exhaustion and wet fastness levels on both PLA and PET fibres.

中文翻译：

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新型杂环二偶氮分散染料对聚乳酸纤维的染色

聚乳酸（PLA）是第一批可熔融加工，可再生，可持续和可生物降解的天然合成纤维。它具有广泛的用途，并结合了生态优势和出色的纺织品性能。PLA纤维是一种脂族聚酯，可以用分散染料进行染色。除了有限数量的市售分散染料外，PLA上的分散染料消耗通常比聚对苯二甲酸乙二醇酯（PET）上的低。在这项研究中，新型杂环二偶氮分散染料在其邻位，间位和对位被甲基，硝基和氯基取代在我们先前的研究中合成的位置被应用于PLA和PET纤维，以检查它们的染色性能，色牢度和染料耗竭性能。获得了深浅不一的黄色，橙色，红棕色和棕色。大多数合成的新型新型杂环二偶氮分散染料均表现出良好的堆积特性，两根纤维均具有较高的K / S水平。对-提供更高的结合的取代基的K / S值比间位-和邻为-NO位置- ₂为纤维和-Cl取代基。总体而言，本研究中合成最新颖的新型杂环二偶氮分散染料表现出良好的增色性能，并具有较高的K / S，PLA和PET纤维的耐疲劳性和耐湿牢度水平。