Dacheng Li, Liangdong Ye, Hongbo Liu, Dongming Chen, Qiaoyan Wei, Xianhui Zhang, Ziwei Li* and Shaorong Lu*,
{"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}
引用次数: 0
Abstract
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.