Poly(vinyl alcohol-co-ethylene) (PVA-co-PE)와 poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA)을 고분자블렌딩 방법으로 50 : 50의 무게비율로써 수소이온 전도성 가교형 전해질막을 제조하였다. PSSA와 PMA이 3 : 1과 1 : 1의 몰 구성비로 되이 있는 두 가지 종류의 PSSA-co-PMA 고분자를 수소이온 전도성 고분자로 사용하였으며, PVA-co-PE 고분자는 에틸렌의 함량이 0, 27 그리고 44 mol%인 고분자를 사용하였다. 전해질 막은 PVA의 히드록실 그룹과 PMA의 카르복시릭 그룹 사이의 에스테르화 반응을 통한 열가교를 통해 제조하였고, FT-IR을 통하여 이를 확인하였다. PSSA-co-PMA의 몰비율이 3 : 1로 구성되어 제조된 전해질막은 몰비율 1 : 1로 구성되어 제조된 막보다 더 낮은 이온교환용량과 더 높은 함수율, 수소이온 전도도를 나타내었다. 또한, 전해질막에서 PE의 함량이 증가할수록 이온교환용량, 함수율, 수소이온 전도도가 계속해서 감소하는 경향성을 보였다. 전해질막의 이러한 물성들은 술폰산기의 함량과 친수성, 막의 가교구조 사이의 경쟁적인 효과로써 설명하였다.
Poly(vinyl alcohol-co-ethylene) (PVA-co-PE)와 poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA)을 고분자 블렌딩 방법으로 50 : 50의 무게비율로써 수소이온 전도성 가교형 전해질막을 제조하였다. PSSA와 PMA이 3 : 1과 1 : 1의 몰 구성비로 되이 있는 두 가지 종류의 PSSA-co-PMA 고분자를 수소이온 전도성 고분자로 사용하였으며, PVA-co-PE 고분자는 에틸렌의 함량이 0, 27 그리고 44 mol%인 고분자를 사용하였다. 전해질 막은 PVA의 히드록실 그룹과 PMA의 카르복시릭 그룹 사이의 에스테르화 반응을 통한 열가교를 통해 제조하였고, FT-IR을 통하여 이를 확인하였다. PSSA-co-PMA의 몰비율이 3 : 1로 구성되어 제조된 전해질막은 몰비율 1 : 1로 구성되어 제조된 막보다 더 낮은 이온교환용량과 더 높은 함수율, 수소이온 전도도를 나타내었다. 또한, 전해질막에서 PE의 함량이 증가할수록 이온교환용량, 함수율, 수소이온 전도도가 계속해서 감소하는 경향성을 보였다. 전해질막의 이러한 물성들은 술폰산기의 함량과 친수성, 막의 가교구조 사이의 경쟁적인 효과로써 설명하였다.
Proton conducting crosslinked membranes have been prepared by polymer blending, which consist of poly(vinyl alcohol-co-ethylene) (PVA-co-PE) and poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA) at 50 : 50 wt ratio. Two kinds of PSSA-co-PMA copolymer with 3 : 1 and 1 : 1 the molar ratio of PS...
Proton conducting crosslinked membranes have been prepared by polymer blending, which consist of poly(vinyl alcohol-co-ethylene) (PVA-co-PE) and poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA) at 50 : 50 wt ratio. Two kinds of PSSA-co-PMA copolymer with 3 : 1 and 1 : 1 the molar ratio of PSSA to PMA wereused as a proton conducting source. The ethylene content of PVA-co-PE was also changed as 0, 27 and 44 mol%. The membranes were thermally crosslinked via the esterification reaction between -OH of PVA and -COOH of PMA, as demonstrated by FT-IR spectroscopy (PVA-co-PE)/(PSSA-co-PMA) membranes with 3 : 1 the molar ratio of PSSA to PMA showed higher ion exchange capacity (IEC), lower water uptake and higher proton conductivity than those with 1 : 1 molar ratio. As the PE concentration increased, the IEC values, water uptake and proton conductivities decreased continuously. These properties were elucidated in terms of competitive effect between the concentration of sulfonic acid, hydrophilicity and the crosslinked structure of membranes.
Proton conducting crosslinked membranes have been prepared by polymer blending, which consist of poly(vinyl alcohol-co-ethylene) (PVA-co-PE) and poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA) at 50 : 50 wt ratio. Two kinds of PSSA-co-PMA copolymer with 3 : 1 and 1 : 1 the molar ratio of PSSA to PMA wereused as a proton conducting source. The ethylene content of PVA-co-PE was also changed as 0, 27 and 44 mol%. The membranes were thermally crosslinked via the esterification reaction between -OH of PVA and -COOH of PMA, as demonstrated by FT-IR spectroscopy (PVA-co-PE)/(PSSA-co-PMA) membranes with 3 : 1 the molar ratio of PSSA to PMA showed higher ion exchange capacity (IEC), lower water uptake and higher proton conductivity than those with 1 : 1 molar ratio. As the PE concentration increased, the IEC values, water uptake and proton conductivities decreased continuously. These properties were elucidated in terms of competitive effect between the concentration of sulfonic acid, hydrophilicity and the crosslinked structure of membranes.
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제안 방법
e. IEC? water uptake and proton conductivity were investigated. FT-IR spectroscopy showed that the membranes were crosslinked via the esterification reaction between -OH of PVA and -COOH of PMA.
대상 데이터
FT-IR spectra of the samples were collected using Excalibur Series FTIR (DIGLAB Co.) instrument between the frequency ranges of 4, 000 to 400 cm" using ATR facility.
Poly(vinyl alcohol) (PVA, Mw = 85,000~124, 000 g/mol, degree of hydrolysis = 99%), poly(vinyl alco-hol-co-ethylene) (PVA-co-PE, the ethylene content = 27 and 44%) and poly(styrene sulfonic acid-co-maleic acid) (PSSA-co-PMA, sodium salt form, the ratio of styrene sulfonic acid to maleic acid = 3:1 and 1 : 1, Mw = 20, 000 g/mol) were purchased from Aldrich and used without further purification.
이론/모형
A four-point probe method was used to measure the proton conductivity of the membranes. Before the measurement of proton conductivity, the prepared membranes were equilibrated with deionized water.
IEC of the membranes was measured by the classical titration method. The membranes were soaked in 1.
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