Effect of Polymerization Conditions on Thermal and Mechanical Properties of Ethylene/1-Butene Copolymer Made with Ziegler-Natta Catalysts

Table 3

DSC analysis for copolymer samples (polymerization time 30 min).

s/number	𝑃C2H4 (bar)	1-Butene fraction (mmol)	Poly.; temp. (°C)	𝑃H2 (bar)	𝑇𝑐 (°C)	𝑇𝑚 (°C)	% cryst. (cooling)
1	5	71.3	60	1	117.89	130.12	46.32
2	5	71.3	60	2	116.86	128.76	49.54
3	5	71.3	60	3	115.52	125.92	53.86
4	5	71.3	80	1	116.91	128.36	48.13
5	5	71.3	80	2	115.42	127.37	52.03
6	5	71.3	80	3	114.37	124.73	56.57
7	5	142.6	60	1	116.83	129.54	48.60
8	5	142.6	60	2	115.52	127.31	52.44
9	5	142.6	60	3	114.63	124.82	55.58
10	5	142.6	80	1	115.34	127.43	50.83
11	5	142.6	80	2	114.45	125.86	53.61
12	5	142.6	80	3	113.92	123.99	56.63
13	10	71.3	60	1	119.55	133.14	51.75
14	10	71.3	60	2	118.56	131.81	54.86
15	10	71.3	60	3	117.94	129.77	57.08
16	10	71.3	80	1	118.34	131.99	53.19
17	10	71.3	80	2	116.57	129.68	56.83
18	10	71.3	80	3	115.29	128.40	59.12
19	10	142.6	60	1	118.67	130.83	53.21
20	10	142.6	60	2	116.79	128.90	56.50
21	10	142.6	60	3	115.80	126.09	61.63
22	10	142.6	80	1	116.77	128.93	55.66
23	10	142.6	80	2	115.12	127.09	59.10
24	10	142.6	80	3	114.69	125.91	63.62