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Separation characteristics of phenyl‐containing stationary phases for gas chromatography based on silarylene‐siloxane copolymer chemistries
Author(s) -
Kiridena Waruna,
Patchett Cheryl C.,
Koziol Wladyslaw W.,
Ahmed Hamid,
Poole Colin F.
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200500274
Subject(s) - copolymer , siloxane , chemistry , gas chromatography , chromatography , organic chemistry , polymer chemistry , polymer
The solvation parameter model is used to characterize the retention properties of five open‐tubular column stationary phases (ZB‐5 ms, DB‐5 ms, DB‐XLB, DB‐17 ms, and DB‐35 ms) based on silarylene‐siloxane copolymer chemistries at five equally spaced temperatures over the range 60–140°C. System constant differences and regression models for varied compounds are used to establish the selectivity equivalence of the silarylene‐siloxane copolymer stationary phases and to compare their separation characteristics with poly(dimethyldiphenylsiloxane) stationary phases containing a nominally similar concentration of phenyl groups. These studies demonstrate that ZB‐5 ms and DB‐5 ms are selectivity equivalent. DB‐XLB is significantly more dipolar and polarizable than DB‐5 ms. In general terms, the silarylene‐siloxane copolymer stationary phases are slightly less cohesive and more dipolar and polarizable with similar hydrogen‐bond basicity to the poly(dimethyldiphenylsiloxane) stationary phases they were designed to replace. None of the silarylene‐siloxane copolymer or poly(dimethyldiphenylsiloxane) stationary phases are hydrogen‐bond acidic. Selectivity differences between the two types of stationary phase are temperature dependent and tend to be smaller at higher temperatures within the temperature range studied. Consequently, selectivity differences cannot be globalized without reference to the temperature for the comparison.