α-amino acid-derived polyamidoamines as photostabilizers for cotton

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-05-20 DOI:10.1016/j.polymdegradstab.2025.111430

Sofia Treccani, Jenny Alongi, Paolo Ferruti, Elisabetta Ranucci

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引用次数: 0

Abstract

Arginine- (M-ARG), glycine- (M-GLY), serine‑ (M-SER), histidine- (M-HIS) and tyrosine/arginine- (M-TYR₃₀-ARG₇₀) derived polyamidoamines (PAAs) were studied as cotton photostabilizers. Cotton strips with a 6 wt. % PAA add-on were subjected to accelerated photoaging in a solar chamber under UVA–UVB exposure at 40 % relative humidity and 30–35 °C. Colorimetric analysis was conducted at 15-minute intervals during irradiation. Virgin cotton exhibited significantly more yellowing than PAA-treated fabrics, except for those treated with M-TYR₃₀-ARG₇₀. Scanning electron microscopy revealed slight surface erosion on untreated cotton (COT) fibers after prolonged UV exposure, whereas PAA-treated cotton (COT/PAA) showed uniform PAA coatings with only minor surface wrinkles and localized fractures. Colorimetric analysis enabled ranking the photostability of COT/PAA samples as follows: COT/M-ARG > COT/M-GLY > COT/M-SER > COT/M-HIS > COT > COT/M-TYR₃₀-ARG₇₀. These results demonstrate that all PAAs enhanced UV protection, except for M-TYR₃₀-ARG₇₀. Nuclear magnetic resonance analysis of PAA coatings extracted from photoaged cotton showed no detectable structural degradation. The results confirm that α-amino acid-derived PAAs effectively protect cotton from photoaging, although formulations containing UVB-absorbing residues exhibit increased susceptibility to irradiation. The effectiveness of PAAs was attributed to the radical scavenging activity of tert‑amine groups and the side-chain residues within their repeat units.

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α-氨基酸衍生的聚酰胺胺作为棉花的光稳定剂

研究了精氨酸- (M-ARG)、甘氨酸- (M-GLY)、丝氨酸- (M-SER)、组氨酸- (M-HIS)和酪氨酸/精氨酸- (M-TYR30-ARG70)衍生的聚酰胺胺（PAAs）作为棉花光稳定剂。添加6 wt. % PAA的棉条在40 %相对湿度和30-35°C的UVA-UVB照射下在太阳能室中加速光老化。照射期间每隔15分钟进行比色分析。除M-TYR30-ARG70处理的织物外，原棉的黄变率明显高于paa处理的织物。扫描电镜显示，未经处理的棉花（COT）纤维在长时间紫外线照射后表面有轻微的侵蚀，而经PAA处理的棉花（COT/PAA）表面有均匀的PAA涂层，只有轻微的表面皱纹和局部断裂。比色分析使COT/PAA样品的光稳定性排序如下：COT/M-ARG >；床/电动发电机比;床/ m比;床/ M-HIS比;床在床/ M-TYR30-ARG70。这些结果表明，除M-TYR30-ARG70外，所有PAAs都增强了紫外线防护。核磁共振分析表明，光老化棉花中提取的PAA涂层没有可检测到的结构降解。结果证实，α-氨基酸衍生的PAAs有效地保护棉花免受光老化，尽管含有吸收uvb残留物的配方对辐射的敏感性增加。PAAs的有效性归因于三胺基及其重复单元内侧链残基的自由基清除活性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.