采用热重分析-傅里叶变换红外光谱(TGA-FTIR)联用技术分析无机物填充高分子复合材料的组分。将试样研磨至粒径为0.1~0.5 mm,取样品13~15 mg,均匀装填于TGA样品盘中,以15 ℃·min-1升温速率进行热重分析,同时采用50 mL·min-1氮气吹扫流量将热分解后析出气体导入傅里叶变换红外光谱仪进行分析。通过解析红外光谱图,鉴别了样品中无机填充物及高分子基质的组分;分析热重曲线,测定了各组分含量,测定结果的相对标准偏差为2.92%;分析比对红外光谱的Gram-Schmidt正交重构图和热重分析的失重百分比-温度微分曲线,评价了热重-红外光谱的联用效果。

TGA-FTIR was used to analyze the composition of inorganic matter filled polymer composites. After being milled to a particle size of 0.1-0.5 mm, 13-15 mg of sample was uniformly loaded into the TGA sample trayfor thermal gravimetric analysis at heating rate of 15 ℃·min-1. The thermal decomposed gas was introduced into sample chamber of the Fourier transform infrared spectrometer by nitrogen stream of 50 mL·min-1. The components of the inorganic filler and polymer matrix were identified from the IR spectra.The abundance of each component was determined by analyzing the TGA curves, with RSD of 2.92%. Comparing the Gram-Schmidt orthogonal reconstruction diagrams of the infrared spectrum and the TGA weight loss percentage-the temperature differential curve, the tandem usage of TGA-FTIR was evaluated.