Page 82 - Basic Gas Chromatography

Phases 69 (GLC) Phases Stationary Liquid OH-(-CH,~CH,-0) ,-H average an with polyethyleneglycol polymeric a 20M, ® Carbowax of Structure 4.7. Fig. 20,000. of weight molecular in 225°C to up used be can and available commercially weight molecular columns. capillary bonded some in 280°C and columns packed series A designed been has 4.8) Fig. (see polymers s

Stationary modified A polar a is the under former the complete that seen slightly more more the evidenced alternative the and/or polymers can The the name. the is it SE-30 SE-52 —
dimethylpolysiloxane. stability and phases. liquid of percentage polar least sold is it Chemical, a in be can it are and replaced by increase as some not meet polarity higher materials in 4.7. Figure in value 20,000; of HP-1 HP-5 HP-17 —_— _ _ —

(-Si-0-Si-0), or temperature commonly changing groups. Figure are same groups Table other liquids of a molecular Liquid Other DB-1 DB-5 DB-17 — values.

CH, | CH, a DB-1®, used the The 4.6; Specialty included 4.4), (Table polarity are polarities 4.5 lists manufacturers. does polymers with polyethyleneglycol these since given is numerical weight Phases* Designations DB-210 _

CH, | | CH, OV-1® of good the by cyanopropyl in shown Valley Both liquid. VI. constants the methyl the groups, constants. by silicone seek series polarity polymers as given a has Polymer SPB-1 SPB-5 SPB-50

Structure have dominate provided is Ohio by a Appendix essentially the As polymers Phases of who A higher for these of weight is 20M® Silicone — — McReynolds

4.6. be and structure OV-101 latter in McReynolds have 87. cyanopropyl McReynolds these listing temperatures. need structure Equivalent SP2100 _— SP-2250 SP-2401 SP-2340 increasing
Fig. Polymers polymers now can phenyl whose and the phases the Apolane and for Common long chromatographers the molecular Carbowax of

Silicone Silicone polymers polarities example and gum silicone ‘From OV-101 phenyl increasing used this operating of The example 4.5 Valley 101 210 In order

68 cone OV-1 a and than tions Other Even all some bond. mate TABLE Ohio Number OV-1, OV-73 OV-17 OV-202, OV-275 *