Preparation and Application of Aromatic Polymer Proton Exchange Membrane with Low-Sulfonation Degree

Table 3

Water absorption and swelling ratio of different polymer films.

	Polymers (°C)	SPES-30	SPES-50	SPTES-30	SPTES-50	Nafion-117
Bibulous rate (%)	18	16.8	50.7	11.2	35.7	16.7
	38	17.5	59.5	12.5	41.3
	58	18.7	76.5	13.5	55.8
	78	23.9	137.5	16.3	104.7	27.5
Swelling rate (%)	18	15.9	40.2	3.9	7.4	12.6
	38	17.2	50.1	5.9	12.5
	58	18.8	73.8	7.2	24.5
	78	22.9	115.4	9.8	69.8	20.8