Quantitative analysis of the antioxidant poly(1,2-dihydro-2,2,4-trimethylquinoline) (pTMQ) was conducted on pristine, thermally-aged, and gamma radiation-aged commercial cross-linked polyethylene-(XLPE-)based cable insulation material aged at temperatures 60, 90, and 115 °C, with gamma radiation exposure dose rates of 0, 120, 300, and 540 Gy/h for 15 days. The quantification of antioxidant was performed using pyrolysis gas chromatography-mass spectrometry (Py-GCMS). Oxidation induction time (OIT) was measured using differential scanning calorimetry (DSC) and correlation was made between the quantified depletion of antioxidant and measured OIT. It was observed that, in the case of isothermal aging, the quantity of antioxidant and OIT decreased with increasing gamma radiation dose. In the case of samples exposed to the same gamma radiation dose, the quantity of antioxidant and OIT were observed to decrease with increasing aging temperature. Depletion in the quantity of antioxidant relative to that in the pristine material ranged from 7 to 93% for differently aged samples. The measured decline in OIT ranged from 0 to 80%. Change in the quantity of antioxidant in the material was observed to follow the same trend as the change in OIT when the samples were aged under various conditions. The observations are explained in terms of the reaction between the antioxidant and free radicals created during exposure of the samples to thermal and gamma radiation.

抗氧化剂聚（1,2-二氢-2,2,4-三甲基喹啉）（pTMQ）的定量分析是在原始的，热老化的和γ辐射老化的商用交联聚乙烯-（XLPE-）电缆上进行的隔热材料在60、90和115°C的温度下老化，并且在0、120、300和540 Gy / h的伽玛射线辐射剂量下持续15天。使用热解气相色谱-质谱（Py-GCMS）进行抗氧化剂的定量。使用差示扫描量热法（DSC）测量氧化诱导时间（OIT），并在定量的抗氧化剂消耗量与测得的OIT之间建立相关性。观察到，在等温老化的情况下，抗氧化剂和OIT的量随γ辐射剂量的增加而降低。对于暴露于相同伽玛射线剂量的样品，随着老化温度的升高，抗氧化剂和OIT的含量降低。相对于原始材料，抗氧化剂的消耗量在不同年龄的样品中为7％到93％。测得的OIT下降幅度为0％至80％。当样品在各种条件下老化时，观察到材料中抗氧化剂含量的变化遵循与OIT变化相同的趋势。观察结果是根据样品在热和伽马射线照射过程中产生的抗氧化剂与自由基之间的反应来解释的。测得的OIT下降幅度为0％至80％。当样品在各种条件下老化时，观察到材料中抗氧化剂含量的变化遵循与OIT变化相同的趋势。观察结果是根据样品在热和伽马射线照射过程中产生的抗氧化剂与自由基之间的反应来解释的。测得的OIT下降幅度为0％至80％。当样品在各种条件下老化时，观察到材料中抗氧化剂含量的变化遵循与OIT变化相同的趋势。观察结果是根据样品在热和伽马射线照射过程中产生的抗氧化剂与自由基之间的反应来解释的。