The Influence of Crown Ether and Alcohol on Unsaturation and Molar Mass of Poly(propylene oxide)s Prepared by Use of Potassium t-Butoxide: Reinvestigation of Chain Transfer Reactions

Table 1

Characterization of unsaturation of PPOs synthesized in the presence of t-BuOK including 18C6 or t-BuOH or t-BuOH/18C6 as additives.

Sample	Initiating system	Macromolecules with unsaturated starting groups (mol %)	(SEC)	(SEC)
Set A
1	t-BuOK	14.0	2600	1.05
2	t-BuOK/18C6 (1/1)	26.8	2300	1.05
3	t-BuOK	28.4	6400	1.07
4	t-BuOK/18C6 (1/1)	40.1	5800	1.06
Set B
5	t-BuOK/t-BuOH (1/1)	10.1	1700	1.07
6	t-BuOK/t-BuOH (1/3)	1.3	1000	1.10
7	t-BuOK/t-BuOH (1/1)	22.5	6000	1.08
8	t-BuOK/t-BuOH (1/3)	12.0	4700	1.12
Set C
9	t-BuOK/t-BuOH/18C6 (1/3/1)	0.5	900	1.06
10	t-BuOK/t-BuOH/18C6 (1/3/2)	0.3	1000	1.04
11	t-BuOK/t-BuOH/18C6 (1/3/3)	0.2	1000	1.05
12	t-BuOK/t-BuOH/18C6 (1/3/1)	4.1	4800	1.02
13	t-BuOK/t-BuOH/18C6 (1/3/2)	3.5	4800	1.09
14	t-BuOK/t-BuOH/18C6 (1/3/3)	3.3	4900	1.04
Set D
15	t-BuOK/t-BuOH/18C6 (1/5/3)	1.1	4100	1.03
16	t-BuOK/t-BuOH/18C6 (1/7/3)	0.3	3700	1.04