We have developed a novel in situ Fourier transform infrared (FTIR) spectroscopic imaging technique that can probe the changes in the chemical structures around the matrix–filler interface of polymer composites during reactive processing. We have applied this imaging technique to maleic anhydride grafted styrene-ethylene butylene-styrene triblock copolymer (MA-SEBS) melt-mixed with silica spheres modified with aminopropyl groups (AmSS). In situ FTIR spectroscopic imaging during the heating process indicates that the C═O component, attributed to the maleamic acid group, is generated by a reaction between maleic acid and amino groups at temperatures exceeding 175 °C around the matrix–filler interface. It thus appears that the formation of interfacial covalent bonds between matrix and filler contributes to mobility restriction in MA-SEBS molecules around the interface, resulting in the improved tensile strength observed in MA-SEBS/AmSS. In-situ FTIR spectroscopic imaging of this type can provide a better understanding of the reinforcement mechanism of composites by reactive processing.

中文翻译：

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原位傅里叶变换红外光谱成像，用于阐明反应过程中基质-填料界面处聚合物复合材料化学结构的变化

我们已经开发了一种新颖的原位傅立叶变换红外（FTIR）光谱成像技术，可以探测反应过程中聚合物复合材料的基质-填料界面周围的化学结构变化。我们已将此成像技术应用于与氨基丙基改性的二氧化硅球熔融混合的马来酸酐接枝的苯乙烯-乙烯丁烯-苯乙烯三嵌段共聚物（MA-SEBS）。原位加热过程中的FTIR光谱成像表明，归因于马来酰胺酸基团的C═O组分是由马来酸与氨基基团在基质-填料界面周围温度超过175°C时发生反应而产生的。因此，似乎在基质和填料之间形成界面共价键有助于限制界面周围的MA-SEBS分子的迁移率，从而提高了在MA-SEBS / AmSS中观察到的拉伸强度。这种类型的原位FTIR光谱成像可以更好地理解通过反应处理增强复合材料的机理。