Synthesis and Properties of Polysilsesquioxanes Having Ethoxysulfonyl Group as a Side Chain

Table 1

Results for the synthesis of SPES^a.

Number	𝑟 (molar ratio of H2O/Si)	Yield (g)	GPC^b		Percentage^c of sulfonic acid/%
			𝑀𝑤	𝑀𝑤/𝑀𝑛
1	1.0	1.77	2.000	1.2	—
2	2.0	1.64	3.200	1.1	—
3	3.0	1.51	4.500	1.1	7
4	5.0	1.50	5.200	1.2	18
5	6.0	1.54	5.800	1.5	32
6	8.0	1.54	4.800	1.5	55
7	10.0	1.50	4.400	1.3	61
8	12.0	1.50	4.600	1.1	79

^aScale in operation: STES 2.10 g (5 mmol). EtOH 0.46 g (10 mmol). Molar ratio: HCl/Si = 0.10.
^bCalculated based on standard polystyrene.
^cCalculated based on the integral ratio of signals in ¹H NMR spectrum.