Polyethylene glycol adipate

Adamantane 2 (0.03 mol) and SF4 (0.2 mol) were reacted in a stainless steel autoclave in a conventional manner. The obtained solid mixture of fluoroadamanlanes was purified by sublimation then separated by preparative GC (10 mm x 5 m column, 25% polyethylene glycol adipate on Spherochroine. 0.2 0.5 mm). 

Stationary phases used for thiophenes include pentaerythritol benzoate, polyethylene glycol adipate, tricresyl phosphate and benzyldiphenyl. Celite 545 is a useful support. 

Component 1 would usually consist of a polyethylene glycol adipate mixed with 5-15% of polypropylene glycol adipate to prevent cold hardening of the linear polyethylene glycol if this was used alone. 

Figure 13.11 illustrates the change in torsional stiffness that can occur as the temperature drops and compares polyurethane with other rubbers. There is only a small increase in the torsional stiffness as the temperature is decreased from -2(fC to about — 25" C, but then the increase in stiffness occurs very rapidly. The second-order transition point is between — 30 and —40°C and it is dependent upon the regularity of the molecular structure. Lower transition temperatures can be obtained by the use of mixed glycol polyadipates in place of the common polyethylene glycol adipate. For example, it is common commercial practice to use a blend of polyethylene... 

Figure 3.2 Separation of fatty acid methyl esters by gas-liquid chromatography on a 2mx4mm column. Stationary phase 10% polyethylene glycol adipate (stabilized with orthophosphoric acid) on Diatomite C-AAW. Carrier gas argon. Flow rate 50ml/1 min. The oven temperature was programmed from 65°C to 185°C at 8°C per min. The sample consists of fatty acids derived from a milk diet for calves. Heptanoic and heptadecanoic acids were added as internal standards in concentrations of 1.55 mg 7 0 and 4.94 mg 17 0 in 10 ml sample solution and the computer was programmed to print out the concentration in mg/10 ml of each fatty acid In the mixture. IS = internal standard BHT = butylated hydroxytoluene (antioxidant). Reproduced with kind permission of Mr J.D. Edwards-Webb.

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