Dacheng Li, Liangdong Ye, Hongbo Liu, Dongming Chen, Qiaoyan Wei, Xianhui Zhang, Ziwei Li* and Shaorong Lu*,
{"title":"植酸螯合二氧化钛纳米改性蔗渣纤维素增强聚乳酸复合材料的阻燃性和机械性能","authors":"Dacheng Li, Liangdong Ye, Hongbo Liu, Dongming Chen, Qiaoyan Wei, Xianhui Zhang, Ziwei Li* and Shaorong Lu*, ","doi":"10.1021/acsapm.4c00340","DOIUrl":null,"url":null,"abstract":"<p >Despite the potential of polylactic acid (PLA) as a biodegradable polymer, widespread applications have been limited by its inherent flammability and brittleness. To overcome these issues, PLA was combined with a composite-reinforced flame-retardant filler (A-MBC/PA/A-TiO<sub>2</sub>) consisting of γ-aminopropyl triethoxysilane (APTES)-grafted microcrystalline bagasse cellulose (A-MBC), phytic acid (PA), and APTES-silylated titanium dioxide nanoparticles (A-TiO<sub>2</sub>). When 10 wt % A-MBC/PA/A-TiO<sub>2</sub> was incorporated, the tensile and impact strengths of the PLA composite increased by 15 and 22%, respectively, relative to those of pristine PLA. The addition of 10 wt % A-MBC/PA/A-TiO<sub>2</sub> resulted in PLA composites with a UL-94 V-0 rating and a high limiting oxygen index of 29% owing to a synergistic flame-retardant mechanism in the gas and condensed phases. The presence of A-MBC/PA/A-TiO<sub>2</sub> contributed to the formation of a solid carbon layer containing P and Ti in the condensed phase as well as the release of PO· free radicals and N-containing noncombustible gases in the gas phase, which reduced the flammable gas and oxygen concentrations, thus providing a synergistic flame-retardant effect. In addition, molecular dynamics simulations of the PLA/(A-MBC/PA/A-TiO<sub>2</sub>) composite system were performed. The numerical and analytical results showed that A-MBC and A-TiO<sub>2</sub> in the filler interacted strongly with the PLA matrix, which was beneficial for distributing the flame retardant in PLA and improving its mechanical and flame-retardant properties. This work demonstrates a strategy for simultaneously improving the flame retardancy and mechanical properties of PLA composites using a biobased composite flame retardant.</p>","PeriodicalId":7,"journal":{"name":"ACS Applied Polymer Materials","volume":null,"pages":null},"PeriodicalIF":4.4000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Enhanced Flame Retardancy and Mechanical Properties of Polylactic Acid Composites with Phytate-Chelated Nanotitanium Dioxide-Modified Bagasse Cellulose\",\"authors\":\"Dacheng Li, Liangdong Ye, Hongbo Liu, Dongming Chen, Qiaoyan Wei, Xianhui Zhang, Ziwei Li* and Shaorong Lu*, \",\"doi\":\"10.1021/acsapm.4c00340\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p >Despite the potential of polylactic acid (PLA) as a biodegradable polymer, widespread applications have been limited by its inherent flammability and brittleness. To overcome these issues, PLA was combined with a composite-reinforced flame-retardant filler (A-MBC/PA/A-TiO<sub>2</sub>) consisting of γ-aminopropyl triethoxysilane (APTES)-grafted microcrystalline bagasse cellulose (A-MBC), phytic acid (PA), and APTES-silylated titanium dioxide nanoparticles (A-TiO<sub>2</sub>). When 10 wt % A-MBC/PA/A-TiO<sub>2</sub> was incorporated, the tensile and impact strengths of the PLA composite increased by 15 and 22%, respectively, relative to those of pristine PLA. The addition of 10 wt % A-MBC/PA/A-TiO<sub>2</sub> resulted in PLA composites with a UL-94 V-0 rating and a high limiting oxygen index of 29% owing to a synergistic flame-retardant mechanism in the gas and condensed phases. The presence of A-MBC/PA/A-TiO<sub>2</sub> contributed to the formation of a solid carbon layer containing P and Ti in the condensed phase as well as the release of PO· free radicals and N-containing noncombustible gases in the gas phase, which reduced the flammable gas and oxygen concentrations, thus providing a synergistic flame-retardant effect. In addition, molecular dynamics simulations of the PLA/(A-MBC/PA/A-TiO<sub>2</sub>) composite system were performed. The numerical and analytical results showed that A-MBC and A-TiO<sub>2</sub> in the filler interacted strongly with the PLA matrix, which was beneficial for distributing the flame retardant in PLA and improving its mechanical and flame-retardant properties. This work demonstrates a strategy for simultaneously improving the flame retardancy and mechanical properties of PLA composites using a biobased composite flame retardant.</p>\",\"PeriodicalId\":7,\"journal\":{\"name\":\"ACS Applied Polymer Materials\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.4000,\"publicationDate\":\"2024-06-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Polymer Materials\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://pubs.acs.org/doi/10.1021/acsapm.4c00340\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Polymer Materials","FirstCategoryId":"92","ListUrlMain":"https://pubs.acs.org/doi/10.1021/acsapm.4c00340","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
尽管聚乳酸(PLA)作为一种可生物降解的聚合物潜力巨大,但其固有的易燃性和脆性限制了其广泛应用。为了克服这些问题,我们将聚乳酸与由γ-氨基丙基三乙氧基硅烷(APTES)接枝的微晶甘蔗渣纤维素(A-MPC)、植酸(PA)和APTES硅烷化二氧化钛纳米颗粒(A-TiO2)组成的复合增强阻燃填料(A-MPC/PA/A-TiO2)结合在一起。当加入 10 wt % 的 A-MBC/PA/A-TiO2 时,聚乳酸复合材料的拉伸强度和冲击强度比原始聚乳酸分别提高了 15% 和 22%。加入 10 wt % A-MBC/PA/A-TiO2 后,由于气相和凝结相中的协同阻燃机制,聚乳酸复合材料达到了 UL-94 V-0 级,极限氧指数高达 29%。A-MBC/PA/A-TiO2 的存在有助于在凝聚相中形成含 P 和 Ti 的固态碳层,并在气相中释放出 PO 自由基和含 N 的不可燃气体,从而降低了可燃气体和氧气的浓度,因此产生了协同阻燃效果。此外,还对聚乳酸/(A-MBC/PA/A-TiO2)复合体系进行了分子动力学模拟。数值和分析结果表明,填料中的 A-MBC 和 A-TiO2 与聚乳酸基体相互作用强烈,有利于阻燃剂在聚乳酸中的分布,并改善其机械和阻燃性能。这项工作展示了一种利用生物基复合阻燃剂同时提高聚乳酸复合材料阻燃性和机械性能的策略。
Enhanced Flame Retardancy and Mechanical Properties of Polylactic Acid Composites with Phytate-Chelated Nanotitanium Dioxide-Modified Bagasse Cellulose
Despite the potential of polylactic acid (PLA) as a biodegradable polymer, widespread applications have been limited by its inherent flammability and brittleness. To overcome these issues, PLA was combined with a composite-reinforced flame-retardant filler (A-MBC/PA/A-TiO2) consisting of γ-aminopropyl triethoxysilane (APTES)-grafted microcrystalline bagasse cellulose (A-MBC), phytic acid (PA), and APTES-silylated titanium dioxide nanoparticles (A-TiO2). When 10 wt % A-MBC/PA/A-TiO2 was incorporated, the tensile and impact strengths of the PLA composite increased by 15 and 22%, respectively, relative to those of pristine PLA. The addition of 10 wt % A-MBC/PA/A-TiO2 resulted in PLA composites with a UL-94 V-0 rating and a high limiting oxygen index of 29% owing to a synergistic flame-retardant mechanism in the gas and condensed phases. The presence of A-MBC/PA/A-TiO2 contributed to the formation of a solid carbon layer containing P and Ti in the condensed phase as well as the release of PO· free radicals and N-containing noncombustible gases in the gas phase, which reduced the flammable gas and oxygen concentrations, thus providing a synergistic flame-retardant effect. In addition, molecular dynamics simulations of the PLA/(A-MBC/PA/A-TiO2) composite system were performed. The numerical and analytical results showed that A-MBC and A-TiO2 in the filler interacted strongly with the PLA matrix, which was beneficial for distributing the flame retardant in PLA and improving its mechanical and flame-retardant properties. This work demonstrates a strategy for simultaneously improving the flame retardancy and mechanical properties of PLA composites using a biobased composite flame retardant.
期刊介绍:
ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers.
The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.