问题描述：
英语翻译
The co-SPI
membranes with smaller IEC values displayed much lower WUs
and the dimensional changes in thickness direction were significantly
decreased,though the expansion in plane direction did
not change too much or even became stronger.The anisotropic
swelling property of co-SPI membranes in water is quite like
other side-chain-type SPIs [21],such as R1 as shown in Table 2.
Some other SPIs with sulfonated groups directly attached in the
polymer main chain also displayed anisotropic properties [22].
The co-SPI
membranes with smaller IEC values displayed much lower WUs
and the dimensional changes in thickness direction were significantly
decreased,though the expansion in plane direction did
not change too much or even became stronger.The anisotropic
swelling property of co-SPI membranes in water is quite like
other side-chain-type SPIs [21],such as R1 as shown in Table 2.
Some other SPIs with sulfonated groups directly attached in the
polymer main chain also displayed anisotropic properties [22].
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