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Abstract
Response surface methodology (RSM) has been applied for optimizing an additive formulation in HDPE. This experimental approach allows a more precise description of the whole complexity of the polymer stabilization. In contrast to the generally used single parameter variations, RSM gives access to the mutual interactions of the additives and their temperature dependence. Several responses (MFI, melt pressure, vinyl unsaturation content) are shown to be sensitive to the composition of the additive system. The data emphasize the importance of the phosphorus based stabilizer for HDPE melt processing. The contribution of the phenolic antioxidant is temperature dependent passing through a maximum. Some interaction terms, including the effects of processing aids, gain importance under certain conditions, and their influence can even surpass the direct contributions of the single additives.
Published Version
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