CAJ | 학술논문

为了优化出DSC测定聚丙烯(PP)熔点过程中的最佳实验条件，通过单因素试验研究了差示扫描量热(DSC)仪测试PP熔点过程中常见影响因素(升温次数、吹扫气流速、升温速率、试样质量)对实验结果的影响；采用正交试验分析了主要影响因素之间的主次大小并优化出最佳的测试条件。实验结果表明，测定PP的熔点只需第2次升温，继续增加升温次数对实验结果的影响不大。吹扫气流速、升温速率与试样质量3个主要因素对PP熔点的影响规律是一致的，吹扫气流速变大，升温速率变快，试样质量越大，测得的PP熔点均变大。正交试验发现，该3因素对实验结果的影响程度不同，升温速率对实验结果的影响最大，试样质量次之，吹扫气流速的影响相对较小。确定的最佳实验条件为：试样质量5 mg，升温速率5 K/min ，吹扫气流速60 mL/min。
위료우화출DSC측정취병희(PP)용점과정중적최가실험조건，통과단인소시험연구료차시소묘량열(DSC)의측시PP용점과정중상견영향인소(승온차수、취소기류속、승온속솔、시양질량)대실험결과적영향；채용정교시험분석료주요영향인소지간적주차대소병우화출최가적측시조건。실험결과표명，측정PP적용점지수제2차승온，계속증가승온차수대실험결과적영향불대。취소기류속、승온속솔여시양질량3개주요인소대PP용점적영향규률시일치적，취소기류속변대，승온속솔변쾌，시양질량월대，측득적PP용점균변대。정교시험발현，해3인소대실험결과적영향정도불동，승온속솔대실험결과적영향최대，시양질량차지，취소기류속적영향상대교소。학정적최가실험조건위：시양질량5 mg，승온속솔5 K/min ，취소기류속60 mL/min。
In order to get the optimal experimental conditions of differential scanning calorimetry(DSC) measurement for melting point of polypropylene (PP),the impact factors including heating times,gas flow rate,heating rate, sample mass on DSC measurement results for melting point of PP were investigated by one-factor experiment. Primary and secondary factors were distinguished and the optimal conditions were obtained by orthogonal experiments. The results show that the second heating is sufficient,because peak temperatures remain unchanged basically in spite of increasing heating times. Influences of gas flow rate, heating rate and sample mass on melting point of PP are similar,as increase of which all leaded the increase of melting point, but the influence degree is different. Among of them,heating rate has the biggest impact on testing results, sample mass being subordinate to it, and gas flow rate is the last. The best experimental results are obtained by using the second scan curve,5 mg of sample mass , 5 K/min of heating rate and 60 mL/min of gas flow rate.