差示扫描量热法和调制差示扫描量热法在线性低密度聚乙烯回料鉴别中的应用
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摘要
对比了差示扫描量热法(DSC)与调制差示扫描量热法(MDSC)的技术差别,并使用DSC和MDSC分别对不同回料添加量线性低密度聚乙烯(LLDPE)的熔融行为进行了分析。对测试结果进行了比较,得出了分辨疑似LLDPE回料的优化MDSC测试条件:温度范围40℃～200℃,升温速率3℃/min,调制周期60s,调制振幅±1℃,吹扫气体为N_2,吹扫流量50mL/min。结果表明,采用MDSC测试方法能快速分辨LLDPE样品中是否含疑似回料,同时能区分实验中的可逆和不可逆过程,弥补了DSC测试方法的局限性。
The technical differences between differential scanning calorimetry(DSC) and modulated differential scanning calorimetry(MDSC) were compared. The melting behaviors of linear low density polyethylene(LLDPE) samples with different adding amounts of recycled LLDPE were analyzed by DSC and MDSC respectively. By comparing the test results,the optimum MDSC test conditions on distinguishing suspected recycled LLDPE were obtained:heating range 40℃～200℃,heating rate 3℃/min,modulation period 60 s,modulation amplitude ±1℃,purging gas N_2,purging flow rate 50 mL/min. From the test results,it can be seen that the MDSC test method can quickly find out the suspected recycled LLDPE,and can distinguish the reversible and irreversible processes in the experiment,which makes up for the limitations of the DSC test method.
The technical differences between differential scanning calorimetry(DSC) and modulated differential scanning calorimetry(MDSC) were compared. The melting behaviors of linear low density polyethylene(LLDPE) samples with different adding amounts of recycled LLDPE were analyzed by DSC and MDSC respectively. By comparing the test results,the optimum MDSC test conditions on distinguishing suspected recycled LLDPE were obtained:heating range 40℃～200℃,heating rate 3℃/min,modulation period 60 s,modulation amplitude ±1℃,purging gas N_2,purging flow rate 50 mL/min. From the test results,it can be seen that the MDSC test method can quickly find out the suspected recycled LLDPE,and can distinguish the reversible and irreversible processes in the experiment,which makes up for the limitations of the DSC test method.
引文
[1] 陈竞泓,李传儒.热分析及其引用[M].北京:科学出版社,1985:233-395.
[2] 杨勇,王保怀.近年来的热分析进展[J].国外分析仪器技术与应用,1998(2):1-10.
[3] 林木良,张坤.热分析在生物学和生物化学上的应用[J].广州化学,1997,25(4):40-50.
[4] 赫丽娜.DSC在石油化工领域的应用进展[J].化学工程与装备,2015,(11):179-181.
[5] 徐丽,李若云,郑娜.聚乳酸-聚乙二醇单甲醚共混体系的调制DSC分析[J].功能高分子学报,2016,29(1):36-42.
[6] 孙梦捷.应用调制差示扫描量热法测量聚烯烃材料的氧化诱导温度[J].轻工科技,2016(2):42-43.
[7] 张玉梅,王华平.MDSC的原理与应用[J].中国纺织大学学报,2000,26(3):118-122.
[8] 牛夏梦,池海涛,刘伟丽,等.差示扫描量热法和调制差示扫描量热法测定聚乳酸热学性质比较[J].理化检验-化学分册,2017,53(7):808-810.
[9] 孟鑫,石靖,裘志浩,等.DSC加速老化试验方法在PP寿命估算中的应用[J].工程塑料应用,2012,40(5):74-76.
[10] 张瑾.聚烯烃氧化诱导期的测试[J].光纤与电缆及其应用技术,2000,24(6):113-117.
[11] 张雪芹,郝伟萍.调制差示扫描量热法研究玻璃化转变温度[J].理化检验-化学分册,2001,37:544-548.
[12] READING M,LUGET A,WILSON R.Modulated differential scanning calorimetry[J].Thermochimica Acta,1994,238(15):295-307.
[13] 陈坚,杨永进,周庆华.调制DSC原理及其应用[J].实验室科学,2011,14(6):97-106.
[14] 鲁红,冯大春,杨继右.DSC、MDSC测定物质比热容的比较[J].分析仪器,2011(3):70-74.
[15] 曾春莲,林志丹,麦堪成.聚丙烯熔融特性与MDSC条件的相关性[J].合成树脂及塑料,2003,20(5):8-11.
[16] 陆昌伟.热分析-质谱联用的新进展[J].中国科学:化学,2015,45(1):57-67.
[17] 李承花,张奕,左琴华.差式扫描量热仪的原理与应用[J].分析仪器,2015(4):88-94.
[18] 魏晓晓,刘伟丽,池海涛,等.食品包装塑料制品中掺杂回收塑料的分析及检测方法研究现状[J].食品安全质量检测学报,2015,6(9):3323-3328.
[19] 陈会明,周丽丽,于文莲,等.再生PET食品包装材料的研究进展[J].中国塑料,2012,26(2):7-12.
[2] 杨勇,王保怀.近年来的热分析进展[J].国外分析仪器技术与应用,1998(2):1-10.
[3] 林木良,张坤.热分析在生物学和生物化学上的应用[J].广州化学,1997,25(4):40-50.
[4] 赫丽娜.DSC在石油化工领域的应用进展[J].化学工程与装备,2015,(11):179-181.
[5] 徐丽,李若云,郑娜.聚乳酸-聚乙二醇单甲醚共混体系的调制DSC分析[J].功能高分子学报,2016,29(1):36-42.
[6] 孙梦捷.应用调制差示扫描量热法测量聚烯烃材料的氧化诱导温度[J].轻工科技,2016(2):42-43.
[7] 张玉梅,王华平.MDSC的原理与应用[J].中国纺织大学学报,2000,26(3):118-122.
[8] 牛夏梦,池海涛,刘伟丽,等.差示扫描量热法和调制差示扫描量热法测定聚乳酸热学性质比较[J].理化检验-化学分册,2017,53(7):808-810.
[9] 孟鑫,石靖,裘志浩,等.DSC加速老化试验方法在PP寿命估算中的应用[J].工程塑料应用,2012,40(5):74-76.
[10] 张瑾.聚烯烃氧化诱导期的测试[J].光纤与电缆及其应用技术,2000,24(6):113-117.
[11] 张雪芹,郝伟萍.调制差示扫描量热法研究玻璃化转变温度[J].理化检验-化学分册,2001,37:544-548.
[12] READING M,LUGET A,WILSON R.Modulated differential scanning calorimetry[J].Thermochimica Acta,1994,238(15):295-307.
[13] 陈坚,杨永进,周庆华.调制DSC原理及其应用[J].实验室科学,2011,14(6):97-106.
[14] 鲁红,冯大春,杨继右.DSC、MDSC测定物质比热容的比较[J].分析仪器,2011(3):70-74.
[15] 曾春莲,林志丹,麦堪成.聚丙烯熔融特性与MDSC条件的相关性[J].合成树脂及塑料,2003,20(5):8-11.
[16] 陆昌伟.热分析-质谱联用的新进展[J].中国科学:化学,2015,45(1):57-67.
[17] 李承花,张奕,左琴华.差式扫描量热仪的原理与应用[J].分析仪器,2015(4):88-94.
[18] 魏晓晓,刘伟丽,池海涛,等.食品包装塑料制品中掺杂回收塑料的分析及检测方法研究现状[J].食品安全质量检测学报,2015,6(9):3323-3328.
[19] 陈会明,周丽丽,于文莲,等.再生PET食品包装材料的研究进展[J].中国塑料,2012,26(2):7-12.