利用差示扫描量热法(DSC),将二次升温曲线熔融焓作为考察变量,通过优化测试条件,建立乙纶(PE)、丙纶(PP)混合物定量分析方法,结果表明,DSC定量分析测试的最佳条件为氮气气氛,吹扫气流50 ml/min,二次升温速率20℃/min,降温速率20 ℃/min,样品质量10 mg左右;PP(或PE)含量与其对应熔融热焓具有很好的线性相关关系,两个组分的线性回归确定系数R2都非常接近1,可实现PP和PE的定量分析;对不同比例的PP/PE混合物进行测试,结果最大偏差满足 GB/T 29862-2013标准的要求,可用于PP/PE混合物及其复合纤维的纤维成分含量测试.%Using differential scanning calorimetry(DSC)method,the melting enthalpy of the secondary heating curve was taken as the investigation variable.The quantitative method of the polyethylene(PE)/polypropylene(PP)mixture was established by opti-mizing the test conditions.The results showed that the optimum conditions for DSC quantitative analysis were nitrogen atmosphere, purge gas flow of 50 ml/min,secondary heating rate of 20 ℃/min,cooling rate of 20 ℃/min,sample weight about 10 mg;The con-tent of PP(or PE)had a good linear relationship with the melting enthalpy,the linear regression coefficient(R2)of the two compo-nents were close to 1.The method could be used in the quantitative analysis of PP/PE mixture.The maximum deviation of the PP/PE mixture met the requirements of GB/T 29862-2013.The method could be used to test the composition content of PP/PE mixture and their composite fiber.
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