Method for characterizing entanglement degree of high-molecular weight polyethylene
A technology of high molecular weight and polyethylene, applied in the direction of measuring devices, analytical materials, material thermal analysis, etc., can solve the problems of difficulty in testing and judging the degree of entanglement of products, and difficulty in judging polyethylene, achieving high reliability and convenient operation , the effect of the data
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Embodiment 1
[0036] Take the ultra-high molecular weight polyethylene raw material with a viscosity average molecular weight of 3 million, and use 120# gasoline as the diluent to obtain the raw material by polymerization in a tank reactor at 80°C. The raw material and decahydronaphthalene solvent were dissolved at 150° C. for 3 hours with a solid content of 1%, and the antioxidant content was 2‰. The resulting solution was introduced into 5°C cooling water at high temperature and cooled for 10 minutes. The obtained solid was placed in n-hexane and extracted for 5 minutes, then taken out and placed in a drying oven for drying at room temperature.
[0037] Weigh 5.0 mg of the dried polyethylene sample and test it in DSC. After heating up to 110°C at a rate of 10°C / min and staying for 10 minutes, the temperature was lowered to 30°C at a rate of 10°C / min, and then raised to 160°C at a rate of 10°C / min. The melting peak after the temperature rise was integrated to obtain a melting enthalpy of...
Embodiment 2
[0041] The ultra-high molecular weight polyethylene raw material with a viscosity average molecular weight of 3 million is taken, and the raw material is obtained by polymerization in a tubular reactor at 20° C. using n-hexane as a diluent. The raw material and decahydronaphthalene solvent were dissolved at 150° C. for 3 hours with a solid content of 1%, and the antioxidant content was 2‰. The resulting solution was introduced into 35°C cooling water at high temperature and cooled for 10 minutes. The obtained solid was placed in n-hexane and extracted for 5 minutes, then taken out and placed in a drying oven for drying at room temperature.
[0042] Weigh 5.0 mg of the dried polyethylene sample and test it in DSC. After heating up to 110°C at a rate of 10°C / min and staying for 10 minutes, the temperature was lowered to 30°C at a rate of 10°C / min, and then raised to 160°C at a rate of 10°C / min. The melting peak after the temperature rise was integrated to obtain a melting enth...
Embodiment 3
[0046] Take an ultra-high molecular weight polyethylene raw material with a viscosity-average molecular weight of 2 million, and place the raw material on a hot-press molding machine for hot-press molding. The hot-press temperature is 220° C., the hot-press time is 4 hours, and the hot-press pressure is 10 MPa. The ultra-high molecular weight polyethylene raw material and trichlorobenzene solvent were dissolved at 150° C. for 4 hours with a solid content of 2%, and the antioxidant content was 4‰. The resulting solution was transferred to 5°C cooling water at high temperature and cooled for 10 minutes. The obtained solid was placed in n-hexane and extracted for 5 minutes, then taken out and placed in a drying oven for drying at room temperature.
[0047] Weigh 5.0 mg of the dried polyethylene sample and test it in DSC. After heating up to 110°C at a rate of 10°C / min and staying for 10 minutes, the temperature was lowered to 30°C at a rate of 10°C / min, and then raised to 160°C ...
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