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POLYETHYLENE FOR IMPROVED BUBBLE STABILITY

IP.com Disclosure Number: IPCOM000218115D
Publication Date: 2012-May-21
Document File: 1 page(s) / 19K

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Abstract

Oxygen tailoring is a reactive extrusion process used to improve polymer properties such as improved bubble stability. The effect of oxygen tailoring on the properties of Ziegler-Natta catalyzed high density polyethylene samples was studied. A number of rheological techniques [dynamic (constant strain, and constant shear), and extensional] showed that for the studied samples, oxygen tailoring results only in a marginal increase of long chain branching, and that the samples are rheological simple, as observed in a small decrease of tan observed at low frequency. Further, differential scanning calorimetry evaluation found no significant differences in the melting and crystallization behavior of the non-tailored and oxygen tailored samples. Similarly, gel permeation chromatography studies showed no significant molecular weight differences.

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POLYOLEFIN FOR IMPROVED BUBBLE STABILITY

Oxygen tailoring is a reactive extrusion process used to improve polymer properties such as improved bubble stability. The effect of oxygen tailoring on the properties of Ziegler-Natta catalyzed high density polyethylene samples was studied. A number of rheological techniques [dynamic (constant strain, and constant shear), and extensional] showed that for the studied samples, oxygen tailoring results only in a marginal increase of long chain branching, and that the samples are rheological simple, as observed in a small decrease of tan δ observed at low frequency. Further, differential scanning calorimetry evaluation found no significant differences in the melting and crystallization behavior of the non-tailored and oxygen tailored samples. Similarly, gel permeation chromatography studies showed no significant molecular weight differences.

The crystallization induction time and the crystallization rate were characterized via isothermal quiescent small amplitude oscillatory shear experiments by measuring the change of η*, G' and G' as function of time at the crystallization temperature. Crystallization rate is defined as the change of G' over time, dG'/dt, where the slope is constant. The crystallization induction time is defined as the intercept of the baseline of G' versus time at the start of the experiment, and the line of constant dG'/dt. The crystallization induction time of the studied oxygen tailored sample is hal...