为了对丙烯腈-丁二烯-苯乙烯（ABS树脂）的分子结构和老化性进行研究，通过中红外（MIR）光谱和变温中红外（TD-MIR）光谱，开展了不同温度下ABS树脂的结构和老化性测试。结果表明：ABS树脂的红外吸收模式主要包括ν_腈基结构、ν_{丁二烯结构}、ν_{聚苯乙烯结构}、ν_烃基结构及ν_羰基结构。在293~573 K的温度范围内，随着测定温度的升高，ABS树脂主要官能团（ν_腈基结构、ν_{丁二烯结构}和ν_{聚苯乙烯结构}）对应的红外吸收频率发生明显的红移或者蓝移现象，其吸收强度均有明显改变。这一现象说明ABS树脂结构抗老化性能降低，主要受到丁二烯结构、腈基结构及苯乙烯结构的协同效应影响。研究拓展了MIR及TD-MIR光谱对重要塑料和树脂的结构及老化性的研究范围。

In order to study the molecular structure and aging behavior of acrylonitrile-butadiene-styrene (ABS resin), the ABS resin at different temperatures were tested by means of mid-infrared (MIR) spectroscopy and temperature-dependent MIR(TD-MIR) spectroscopy. The results show that the infrared absorption modes of ABS resin mainly include ν_{Nitrile based structure}, ν_{Butadiene structure}, ν_{Polystyrene structure}, ν_{Hydrocarbon based structure} and ν_{Carbonyl structure}. In the temperature range of 293~573 K, with the increase of measurement temperature, the infrared absorption frequency corresponding to the main functional groups (ν_{Nitrile based structure}, ν_{Butadiene structure} and ν_{Polystyrene structure}) of ABS resin has appeared obvious red shift or blue shift phenomenon, and its absorption intensity has obvious change. This phenomenon indicates that the anti-aging property of ABS resin is decreased, which is mainly affected by the synergistic effect of butadiene structure, nitrile structure and styrene structure. The research has expanded the research scope of MIR and TD-MIR spectra in the structure and aging properties of important plastics and resins materials.