Variation of Comonomer Content in LLDPE Particles with Different Sizes from an Industrial Fluidized Bed Reactor
2015
Rashedi, Reza | Sharif, Farhad
Properties of linear low-density polyethylene (LLDPE) are highly influenced by molecular weight distribution and comonomer content. Our study quantifies comonomer content variation for LLDPE particles with different sizes. Powder from the fluidized-bed reactor was sieved to subsets with different sizes. FTIR showed a meaningful difference in average comonomer content among subsets. To study comonomer content distribution in each subset, successive self-nucleation and annealing (SSA) thermal fractionation via differential scanning calorimetry (DSC) was performed. This study showed that each subset not only differs in the average comonomer content but also in comonomer content distribution. Particles with a median diameter of 1500 μm had the highest average comonomer content, which was different from that of the final product. Minimum average comonomer content and narrowest comonomer distribution was observed in the smallest particles with median diameter of 750 μm and high molecular weight.
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