Autoclave performances, comparison

Polymerizations with nickel salicylaldimine complexes 87-101 were performed in a 1 L steel autoclave at 40 bar and 30 °C. The nickel complexes (0.09 mmol) were activated with equimolar amounts of Ni(COD)2 in toluene solutions for 30 min after which the autoclave was pressurized with ethene. The reaction was terminated after 1.5 h by venting the ethene and the formed polymer powder was isolated. Details are summarized in Tab. 3.9. For comparison, complex 134, a nickel salicylaldimine complex with a 2,6-(diisopropyl)phenyl imine substituent, was screened under the same conditions. 

Cure pressure for woven CFRP epoxy was varied in three steps (0.69, 0.31 and 0.10 MPa) by Li and Crosky [72] and affected physical and mechanical properties, including the interlaminar fracture toughness of the laminates. A comparison of different processes (autoclave versus proprietary Quickstep ) for a unidirectional CFRP epoxy (T800H/3900-2) indicated similar quasi-static mode I values (554 and 527 J/m, respectively) but a significantly increased fatigue performance for the latter [73]. 

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