Multimodal polyethylene composition obtainable with high activity catalyst
A composition and polyethylene technology, applied in the production of bulk chemicals, etc., can solve problems such as adverse effects of polymer properties and ideal reactions, and achieve the effects of improved appearance, beneficial purity, and improved impact strength
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[0168] 1. Definitions and Measurement Methods
[0169] a) molecular weight
[0170] Weight average molecular weight M w and molecular weight distribution (MWD=M w / M n , where M n is the number average molecular weight, and M w is the weight average molecular weight) was measured by a method based on ISO 16014-4:2003. A Waters 150CV plus instrument was used with a column 3 x HT&E styragel (divinylbenzene) from Waters and trichlorobenzene (TCB) as solvent at 140°C. Use the common narrow MWD PS standard (for PS, the Mark-Howwink constant K: 9.54*10 -5 and a: 0.725; and for PE, K: 3.92*10 -4 and a: 0.725) to calibrate the column setting. m w with M n The ratio of is a measure of the width of the distribution, since each is affected by opposite ends of the "population".
[0171] b) Density
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