Liquid crystalline polyurethane/POSS hybrid nanocomposites pyrolysis studies by Py-GC/MS and TG/FTIR techniques

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2024-06-20 DOI:10.1016/j.tca.2024.179803

Artur Bukowczan, Paulina Zając, Krzysztof Pielichowski

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引用次数: 0

Abstract

The process of pyrolysis of liquid crystalline polyurethane (LCPU) composites with polyhedral oligomeric silsesquioxanes (POSS) has been studied using pyrolysis - gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry/Fourier transform infrared spectroscopy (TG/FTIR) coupled thermoanalytical techniques. LCPU elastomers modified with POSS molecules with different architectures, bearing aromatic, isobutyl and cycloaliphatic moieties, yield various volatile products of pyrolysis that were collected and characterized. The TG study showed significant differences in the thermal behavior of composites studied, evidencing the influence of the silsesquioxane type on the polyurethane pyrolysis paths. FTIR study of volatile products of thermal decomposition showed the presence of characteristic bands originated from carbonyl, amine, ether, methylene, and unsaturated hydrocarbon linkages. GC/MS investigation confirmed the existence of compounds identified by the IR method. The application of both thermoanalytical methods made it possible to postulate the thermal decomposition routes of PU/POSS hybrids and to point out the main factors responsible for changes in the thermal stability.

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利用 Py-GC/MS 和 TG/FTIR 技术进行液晶聚氨酯/POSS 混合纳米复合材料热解研究

利用热解-气相色谱/质谱（Py-GC/MS）和热重/傅立叶变换红外光谱（TG/FTIR）耦合热分析技术，研究了液晶聚氨酯（LCPU）与多面体低聚硅烷烃（POSS）复合材料的热解过程。用不同结构的 POSS 分子改性的 LCPU 弹性体含有芳香族、异丁基和环脂族分子，在热解过程中产生了各种挥发性产物，对这些产物进行了收集和表征。TG 研究表明，所研究的复合材料在热行为上存在显著差异，这证明了硅倍半氧烷类型对聚氨酯热解路径的影响。对热分解挥发物的傅立叶变换红外光谱研究表明，存在来自羰基、胺、醚、亚甲基和不饱和碳氢化合物链节的特征谱带。气相色谱/质谱调查证实了红外方法所确定的化合物的存在。通过这两种热分析方法的应用，可以推测出聚氨酯/聚醚砜（PU/POSS）混合物的热分解路线，并指出导致热稳定性变化的主要因素。

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来源期刊

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