Experimental consideration of the effects of calcium lignosulfonate and tannic acid on the flammability and thermal properties of polylactide composites

IF 3.1 2区 化学 Q2 CHEMISTRY, ANALYTICAL
Tomasz M. Majka , Ana Cláudia Pimentel , Susete Fernandes , Henrique Vazão de Almeida , João Paulo Borges , Rodrigo Martins
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Abstract

The purpose of this study was to determine the quantitative and qualitative effects of the form of natural phenolic compounds (NPCs) on the decomposition of polylactide (PLA) under different measurement conditions. For this purpose, thermogravimetry analysis (TGA), differential scanning calorimetry (DSC), and pyrolysis-combustion flow calorimetry (PCFC) analyses were carried out not only on individual raw materials like calcium lignosulfonate (BX), tannic acid (TA), BX chemically modified with TA (BMT), but also on PLA/BX, PLA/TA, and PLA/BMT composites with 3, 6, and 9 wt.% of filler. Moreover, the work checked whether to obtain satisfactory results it is necessary to carry out chemical modification lasting many hours, or whether simple physical mixing of ingredients (TABX) is enough, e.g. in proportions 1:2, 2:4, 3:6. The results of these analyses showed that TA is neither a good flame retardant nor a highly swelling material, but when combined with BX physically or chemically, it can produce an interesting synergistic effect. This work proves that chemically obtained BMT hybrid material allows to reduce flammability by 30 % compared to PLA which cannot be achieved by physically mixing these components in a polymer melt. On the other hand, the addition of TABX is sufficient to achieve a good thermal stabilization effect under processing conditions.

Abstract Image

木质素磺酸钙和单宁酸对聚乳酸复合材料可燃性和热性能影响的实验研究
本研究的目的是确定天然酚类化合物(NPC)的形态在不同测量条件下对聚乳酸(PLA)分解的定量和定性影响。为此,不仅对木质素磺酸钙(BX)、单宁酸(TA)、TA 化学修饰的 BX(BMT)等单个原材料进行了热重分析(TGA)、差示扫描量热法(DSC)和热解-燃烧流动量热法(PCFC)分析,还对含有 3、6 和 9 wt.% 填料的聚乳酸/BX、聚乳酸/TA 和聚乳酸/BMT 复合材料进行了分析。此外,这项工作还检查了要获得令人满意的结果,是否有必要进行长达数小时的化学改性,或者是否只需对成分(TABX)进行简单的物理混合即可,例如按 1:2、2:4、3:6 的比例混合。这些分析结果表明,TA 既不是一种良好的阻燃剂,也不是一种高膨胀性材料,但当它与 BX 物理或化学结合时,可以产生有趣的协同效应。这项工作证明,通过化学方法获得的 BMT 混合材料比聚乳酸材料的可燃性降低了 30%,而这是在聚合物熔体中物理混合这些成分无法实现的。另一方面,添加 TABX 足以在加工条件下实现良好的热稳定效果。
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来源期刊
Thermochimica Acta
Thermochimica Acta 化学-分析化学
CiteScore
6.50
自引率
8.60%
发文量
210
审稿时长
40 days
期刊介绍: Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes
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