Hamid J. Mohammad, Ayysha Shihab Ahmed, Taiseer Abdul-kader Saleh, Mohammed Basil Anwer, Hussein A. Hamzah, Sohad A. Alshareef, Zamzam Alhuwaymil, Rasha Saad Jwad, Mohammed H. Al-Mashhadani
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The stabilization effect of the AD molecule was studied by using the weight loss method and tracking the functional group indices of CO (I<sub>CO</sub>) and O<span></span>H (I<sub>OH</sub>) that emerge because of polymer degradation after irradiation with UV light for 300 h. The films' structures were studied by scanning electronic microscopy (SEM), atomic force microscope (AFM), and energy-dispersive x-ray spectroscopy (EDX) to evaluate the stabilization enhancement of AD moiety. The results exhibit a significant decrease in weight loss for blended PLA, in contrast to blank PLA. The weight loss percentage reduced from 2.5 for blank PLA to less than 0.7 for blended PLA. Furthermore, I<sub>CO</sub> and I<sub>OH</sub> indices witness a remarkable reduction which verifies the improved photodegradation resulting from AD moiety. The suggested method involves the efficient absorption of UV radiation produced during photo-degradation by the AD molecule, which then emits this light as visible blue light without causing any damage to PLA film's chemical structure. Our results demonstrate the adaptability of AD molecules as PLA photo-stabilizers and point to their wider significance for sustainable material applications. This work advances the stability of PLA films and provides opportunities for the creation of novel stabilization techniques based on organic electrical principles. Future studies may examine the multipurpose uses of the AD molecule in sensor materials and other contexts.</p>\n </section>\n \n <section>\n \n <h3> Highlights</h3>\n \n <div>\n <ul>\n \n <li>Presenting a novel acceptor–donor Schiff base as a phot stabilizer of PLA.</li>\n \n <li>Using the weight loss method and tracking the functional group indices to test the degradation.</li>\n \n <li>A significant decrease in weight loss for blended PLA, in contrast to blank PLA.</li>\n \n <li>The Schiff base absorbing UV light, excited electrons from ground state to excited state.</li>\n \n <li>They return to the ground state and produce bright blue light.</li>\n \n <li>These movement of electrons cause no damage to the PLA polymer chains.</li>\n </ul>\n </div>\n </section>\n </div>","PeriodicalId":17662,"journal":{"name":"Journal of Vinyl & Additive Technology","volume":"30 6","pages":"1570-1583"},"PeriodicalIF":3.8000,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Synthesis of a new Schiff base acceptor–donor molecule as a UV stabilizer for enhanced poly(lactic acid) (PLA) photoprotection\",\"authors\":\"Hamid J. 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引用次数: 0
摘要
聚乳酸（PLA）是一种可生物降解的脂肪族聚酯，备受关注。由于其特性，聚乳酸是各领域应用最广泛的聚合物之一。然而，热、紫外线和湿度等环境条件会加速聚合物的老化过程，从而对其性能产生负面影响。在本研究中，我们提出了一种新型受体-捐献者（AD）席夫碱分子，当这种分子加入聚合物基质中时，能显著稳定紫外线。我们采用失重法研究了 AD 分子的稳定效果，并跟踪了紫外线照射 300 小时后聚合物降解产生的 CO (ICO) 和 OH (IOH) 官能团指数。我们还通过扫描电子显微镜 (SEM)、原子力显微镜 (AFM) 和能量色散 X 射线光谱 (EDX) 研究了薄膜的结构，以评估 AD 分子的稳定增强效果。结果表明，与空白聚乳酸相比，混合聚乳酸的失重率明显降低。失重百分比从空白聚乳酸的 2.5 降至混合聚乳酸的 0.7 以下。此外，ICO 和 IOH 指数也显著降低，这证明 AD 分子改善了光降解。所建议的方法包括 AD 分子有效吸收光降解过程中产生的紫外线辐射，然后将其发射为可见蓝光，而不会对聚乳酸薄膜的化学结构造成任何破坏。我们的研究结果证明了 AD 分子作为聚乳酸光稳定剂的适应性，并指出其在可持续材料应用中的广泛意义。这项工作提高了聚乳酸薄膜的稳定性，并为基于有机电学原理创造新型稳定技术提供了机会。未来的研究可能会考察 AD 分子在传感器材料和其他方面的多用途用途。 重点介绍 一种新型受体-捐献者席夫碱作为聚乳酸的光稳定剂。采用失重法和官能团指数跟踪法测试降解情况。与空白聚乳酸相比，混合聚乳酸的失重明显减少。希夫碱吸收紫外线，激发电子从基态进入激发态。它们返回基态并产生明亮的蓝光。这些电子运动不会对聚乳酸聚合物链造成任何损害。
Synthesis of a new Schiff base acceptor–donor molecule as a UV stabilizer for enhanced poly(lactic acid) (PLA) photoprotection
Poly(lactic acid) (PLA) is a biodegradable aliphatic polyester of significant interest. Owing to its traits, PLA stands out as one of the most widely used polymers in various fields. Nevertheless, environmental conditions, such as heat, UV light, and humidity have negative impacts on the polymer's performance as a result of the accelerating aging process. In this study, we present a novel acceptor–donor (AD) Schiff base molecule that demonstrates significant UV stabilization when incorporated into the polymer's matrix. The stabilization effect of the AD molecule was studied by using the weight loss method and tracking the functional group indices of CO (ICO) and OH (IOH) that emerge because of polymer degradation after irradiation with UV light for 300 h. The films' structures were studied by scanning electronic microscopy (SEM), atomic force microscope (AFM), and energy-dispersive x-ray spectroscopy (EDX) to evaluate the stabilization enhancement of AD moiety. The results exhibit a significant decrease in weight loss for blended PLA, in contrast to blank PLA. The weight loss percentage reduced from 2.5 for blank PLA to less than 0.7 for blended PLA. Furthermore, ICO and IOH indices witness a remarkable reduction which verifies the improved photodegradation resulting from AD moiety. The suggested method involves the efficient absorption of UV radiation produced during photo-degradation by the AD molecule, which then emits this light as visible blue light without causing any damage to PLA film's chemical structure. Our results demonstrate the adaptability of AD molecules as PLA photo-stabilizers and point to their wider significance for sustainable material applications. This work advances the stability of PLA films and provides opportunities for the creation of novel stabilization techniques based on organic electrical principles. Future studies may examine the multipurpose uses of the AD molecule in sensor materials and other contexts.
Highlights
Presenting a novel acceptor–donor Schiff base as a phot stabilizer of PLA.
Using the weight loss method and tracking the functional group indices to test the degradation.
A significant decrease in weight loss for blended PLA, in contrast to blank PLA.
The Schiff base absorbing UV light, excited electrons from ground state to excited state.
They return to the ground state and produce bright blue light.
These movement of electrons cause no damage to the PLA polymer chains.
期刊介绍：
Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.
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