Elution behavior of polyethylene and polypropylene standards on carbon sorbents.

Elution behavior of polyethylene and polypropylene standards on carbon sorbents.
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聚乙烯和聚丙烯标准品在碳吸附剂上的洗脱行为

DOI:
10.1016/j.chroma.2010.10.036
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发表时间:
2010
期刊:
Journal of chromatography. A
影响因子:
--
通讯作者:
G. Kalies
G. Kalies
中科院分区:
--
文献类型:
--
作者:
R. Chitta;T. Macko;R. Brüll;G. Kalies

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线性聚乙烯和全同立构,无规立构和间同立构聚丙烯的洗脱行为进行了测试,使用三种不同的碳柱填料:多孔石墨(Hypercarb),多孔氧化锆覆盖的碳(ZirChrom-CARB),和活性炭TA 95。选择沸点高于150°C的几种极性溶剂作为移动的相:2-乙基-1-己醇、正癸醇、乙酸环己酯、乙酸己酯、环己酮、乙二醇单丁醚和一种非极性溶剂正癸烷。聚乙烯标准品完全或部分吸附在所有测试的吸附剂/溶剂系统。聚丙烯标准品部分吸附在Hypercarb和碳TA 95上,但不吸附在ZirChrom-CARB上。当2-乙基-1-己醇、乙酸环己酯或乙酸己酯在150或160°C下用作移动的相时,ZirChrom-CARB显著地保留聚乙烯,而聚丙烯的所有三种基本立体异构体在这些吸附剂/溶剂对中以尺寸排阻模式洗脱。这与Hypercarb/1-癸醇系统非常不同,后者根据聚丙烯的立构规整度分离聚丙烯。聚乙烯和聚丙烯在ZirChrom-CARB/2-乙基-1-己醇体系中的相反洗脱行为(聚丙烯洗脱,聚乙烯完全吸附)使聚乙烯和聚丙烯共混物实现分离。用Hypercarb/2-乙基-1-己醇/1,2,4-三氯苯体系分离乙烯/1-己烯共聚物。
The elution behavior of linear polyethylene and isotactic, atactic and syndiotactic polypropylene was tested using three different carbon column packings: porous graphite (Hypercarb), porous zirconium oxide covered with carbon (ZirChrom-CARB), and activated carbon TA 95. Several polar solvents with boiling points above 150°C were selected as mobile phases: 2-ethyl-1-hexanol, n-decanol, cyclohexylacetate, hexylacetate, cyclohexanone, ethylene glycol monobutyl ether and one non-polar solvent, n-decane. Polyethylene standards were completely or partially adsorbed in all tested sorbent/solvent systems. Polypropylene standards were partially adsorbed on Hypercarb and carbon TA95, but did not adsorb on ZirChrom-CARB. ZirChrom-CARB retained polyethylene pronouncedly when 2-ethyl-1-hexanol, cyclohexylacetate or hexylacetate were used as mobile phases at temperature 150 or 160°C, while all three basic stereoisomers of polypropylene eluted in size exclusion mode in these sorbent/solvent pairs. This is very different from the system Hypercarb/1-decanol, which separated polypropylene according to its tacticity. The opposite elution behavior of polyethylene and polypropylene in system ZirChrom-CARB/2-ethyl-1-hexanol (polypropylene eluted, polyethylene fully adsorbed) enabled to realize separation of blends of polyethylene and polypropylene. Ethylene/1-hexene copolymers were separated according to their chemical composition using system Hypercarb/2-ethyl-1-hexanol/1,2,4-trichlorobenzene.
使用芳香烃的高效液相色谱法表征吸附剂多孔石墨及其与硅胶、氧化铝、十八烷基二氧化硅和苯基二氧化硅的比较
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发表时间: 1994
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发表时间: 1978
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