Effect of polymer topology on the curing process and mechanical characteristics of epoxy thermosets modified with linear or multiarm star poly(ε-caprolactone)
作者： Mireia Morell , Xavier Ramis , Francesc Ferrando , Àngels Serra
DOI: 10.1016/J.POLYMER.2011.07.040
关键词:
摘要: Abstract A well-defined multiarm star copolymer, hyperbranched poly(glycidol)- b -poly( e -caprolactone), with an average of 100–110 arms per molecule and a molecular weight 1000 g/mol (s-PCL) linear PCL analog (l-PCL) were used as modifiers in the curing diglycidylether bisphenol (DGEBA) using ytterbium triflate cationic initiator. The effect polymer topology on gelation was studied by dynamic scanning calorimetry (DSC) rheometry. addition s-PCL to resin left complex viscosity ( η∗ ) practically unaltered. In contrast l-PCL incremented substantially viscosity. star-shaped decreased shrinkage after higher extent than analog. homogeneity pure DGEBA modified thermosets proved thermomechanical analysis (DMTA) electronic microscopy (SEM). star-like structures led impact energy fracture comparison lower microhardness
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