Parameters Optimization of Successive Self-nucleation/Annealing Thermal Fractionation Experiments for Polyethylene Resin and Comparison with Step Crystallization
A branched polyethylene resin was selected as an example to study the effects of experimental parameters of successive self-nucleation and annealing method on the results of thermal fractionation.Experimental parameters
such as the first selected self-seeding temperature (Ts)
heating and cooling temperature rates
temperature interval (T)
and the permanence time at Ts
are studied extensively in successive self-nucleation and annealing (SSA) thermal fractionation.A series of optimized parameters are obtained
which provide the reference for its application.In addition
the results from step crystallization (SC) and SSA thermal fractionations are compared carefully.