International Journal of Polymer Science / 2016 / Article / Tab 4

Research Article

A Comparative Study of AlCl3 and FeCl2-Modified TiCl4/MgCl2/THF Catalytic System in the Presence of Hydrogen for Ethylene Polymerization

Table 4

Influences of Lewis acids and hydrogen on polyethylene.

CatalystH2/C2H4 molar ratioMelting temperature  
() in °C
Crystallinity  
() in %
Mw
(g/mol)
Mn
(g/mol)
Mw/Mn

None-THF0132.955.4
0.08131.258.0452,12774,1556.1
0.20129.859.7249,21440,2926.2
0.30129.056.2178,78631,2775.7

Al-THF0133.854.7
0.08131.260.7335,552538106.2
0.20130.060.1204,61435,8525.7
0.30130.168.5189,56833,5575.7

Fe-THF0134.252.8
0.08131.955.7370,02156,9986.5
0.20130.066.8230,27235,7566.4
0.30130.062.8201,31229,1076.9

Determined by DSC.
Determined by GPC.
Condition: polymerization was performed in 2 L autoclave, [Ti] = 0.008 mmol for all catalysts, Al/Ti molar ratio = 140, cocatalyst = TEA, polymerization time = 1 h, reaction temperature = 80°C, total pressure = 8 bars under 1 bar of nitrogen, and desired amount of H2/C2H4 molar ratio = 0, 0.08, 0.20, and 0.30.

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