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. 2022 Apr 14;12(19):11715–11721. doi: 10.1039/d2ra00165a

The results of copolymerization of ethylene with 1-octene using (F-salalen)TiCl2 in the presence of MAOa.

Entry Al/Ti (mol mol−1) T p (°C) 1-Oct. feed (mol L−1) Activityb M w c ×10−6 M w/Mnc T m d (°C) ΔHd (J g−1) X c d (%) 1-Oct. cont.e (mol%)
1 600 50 0 56.5 2.64 2.4 134.6 204.5 69.8 0
2f 600 50 1.2 n.d
3 600 30 1.0 35.6 1.89 2.1 125.0 177.3 60.5 0.9
4 600 40 1.0 42.0 1.23 2.2 124.1 141.0 48.1 1.8
5 600 50 1.0 92.3 0.87 2.6 119.4 80.6 27.5 3.1
6 600 70 1.0 141.0 0.22 3.2 120.5 85.3 29.1 2.0
7 600 90 1.0 101.2 0.10 3.9 120.9 136.9 46.7 1.9
8 200 50 1.0 63.5 1.64 1.9 123.5 101.1 34.5 2.0
9 400 50 1.0 87.0 1.24 2.1 123.3 83.8 28.6 2.6
10 800 50 1.0 35.0 0.57 3.4 123.5 101.4 34.6 2.2
11 600 50 0.2 79.8 1.26 2.7 128.7 172.1 58.7 1.2
12 600 50 0.4 127.5 1.00 2.9 124.4 160.6 54.8 1.7
13 600 50 0.8 132.5 0.89 2.6 122.3 92.2 31.5 2.8
14 600 50 2.0 64.0 0.78 2.7 117.9 65.8 22.5 6.4
a

Polymerization conditions: catalyst, 20.0 μmol; ethylene pressure, 15 atm; total volume, 70 mL; reaction time, 30 min.

b

103 g polymer (mol Ti)−1 h−1.

c

g mol−1, determined by HT-GPC in 1,2,4-TCB versus polystyrene standard.

d

Determined by DSC at a heating rate of 10 °C min−1 and used the second heating curves.

e

1-Octene incorporation (mol%) estimated by 13C NMR spectra.

f

1-Octene homopolymerization, ethylene pressure, 0 atm.