Correlation of Polymerization Conditions with Thermal and Mechanical Properties of Polyethylenes Made with Ziegler-Natta Catalysts

Table 4

Results of mechanical testing for polyethylene samples.

Sample			Temp.	Time	Modulus	Yield stress	Yield strain	Strain at break	Tensile strength
	(bar)	(bar)	(°C)	(hour)	(MPa)	(MPa)	(%)	(%)	(MPa)
1	5	0	60	0.5			4
2	5	0	60	1			4
3	5	0	80	0.5			4
4	5	0	80	1			4
5	5	2	60	0.5			4
6	5	2	60	1			4
7	5	2	80	0.5			4
8	5	2	80	1			4
9	5	5	60	0.5			4
10	5	5	60	1			4
11	5	5	80	0.5			3
12	5	5	80	1			4
13	10	0	60	0.5			4
14	10	0	60	1			3.6
15	10	0	80	0.5			4.0
16	10	0	80	1			3.8
17	10	2	60	0.5			3.8
18	10	2	60	1			3.7
19	10	2	80	0.5			4
20	10	2	80	1			3
21	10	5	60	0.5			3
22	10	5	60	1			3.5
23	10	5	80	0.5			3
24	10	5	80	1			3.5