本研究成功合成主鏈含有疏水基結構之聚苯醚共聚物(SPAEs)，並將磺酸基導入在側鏈上，首先經由親核性取代聚合反應合成含CF3之Poly(arylene ether)s (PAEs)，以Chlorosulfonic acid為磺酸化試劑，直接將聚合物磺酸化，即可得到磺酸基位於側鏈上的SPAEs。
　　所合成的側鏈型SPAEs，均可塗佈成具有韌性的薄膜，且具有好的熱安定性與機械性質。其質子傳導度會隨著溫度增加而增加，本研究所合成側鏈型SPAEs，大部分它們的質子傳導度比Nafion 117高，在80 ℃，SPAE2-CH100系列(IEC=1.50 mequiv./g)有最高的質子傳導度為288 mS/cm。與主鏈型聚合物相比較，側鏈型SPAEs系列具有相對低吸濕率、膨潤度與相對高質子傳導度的特性，由TEM結果顯示側鏈型SPAEs親水相均勻分布，容易形成連續的離子通道，質子傳導度也較高。其甲醇滲透率在1.2~6.0×10-7 cm2/sec之間，都低於Nafion 117(16×10-7 cm2/sec)。因此這些含側鏈型磺酸基的SPAEs具有高質子傳導度、低甲醇滲透率和合理的穩定性，是很有潛力成為直接甲醇燃料電池的質子交換膜材料。

A series of side-chain-type sulfonated trifluoromethyl-based poly(arylene ether)s (SPAEs) were prepared by polycondensation via a nucleophilic substitution reaction followed by post-sulfonation.
Tough and flexible films of the SPAEs with good thermal and mechanical stability were obtained by solvent cast process in N,N-dimethylacetamide (DMAc) solution. Proton conductivities of the copolymers increased gradually with increase in temperature. Most of SPAEs exhibited higher proton conductivity than Nafion 117. SPAE2-CH100 had the highest proton conductivity (288 mS/cm at 80 ℃) among the tested membranes. The side-chain-type SPAEs film showed high proton conductivity and good dimensional stability, and their water uptake and swelling ratio were lower than those of the main-chain-type SPAEs with similar ion exchange capacity (IEC) value. Transmission electron microscopy (TEM) was used to examine the microstructures of the membranes and the side-chain-type results revealed that significant hydrophilic/hydrophobic microphase separation with spherical, uniform-size and well-dispersed hydrophilic domains was afforded. In addition, the membranes exhibited low methanol permeability in the range of 1.2~6.0×10-7 cm2/sec, which are much lower than that of Nafion 117 (16×10-7 cm2/sec).
Thus, these side-chain-type SPAEs could be the promising materials as alternative to Nafion membrane for direct methanol fuel cells applications because of them with high proton conductivity, low methanol permeability, and reasonable long-term stability.

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