TY - JOUR
T1 - Proton transport properties of poly(aspartic acid) with different average molecular weights
AU - Nagao, Yuki
AU - Imai, Yuzuru
AU - Matsui, Jun
AU - Ogawa, Tomoyuki
AU - Miyashita, Tokuji
N1 - Funding Information:
The authors thank Ms. M. Sasaki for helping with the synthesis procedure and Primary Cell Co., Ltd., Japan for supply of Stains All Gel Staining kit AK02. This study was supported by the Program for Improvement of Research Environment for Young Researchers from Special Coordination Funds for Promoting Science and Technology (SCF) commissioned by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
PY - 2011/4
Y1 - 2011/4
N2 - We synthesized seven partially protonated poly(aspartic acids)/sodium polyaspartates (P-Asp) with different average molecular weights to study their proton transport properties. The number-average degree of polymerization (DP) for each P-Asp was 30 (P-Asp30), 115 (P-Asp115), 140 (P-Asp140), 160 (P-Asp160), 185 (P-Asp185), 205 (P-Asp205), and 250 (P-Asp250). The proton conductivity depended on the number-average DP. The maximum and minimum proton conductivities under a relative humidity of 70% and 298 K were 1.7 · 10-3 S cm-1 (P-Asp140) and 4.6 · 10-4 S cm-1 (P-Asp250), respectively. Differential thermogravimetric analysis (TG-DTA) was carried out for each P-Asp. The results were classified into two categories. One exhibited two endothermic peaks between t = (270 and 300) °C, the other exhibited only one peak. The P-Asp group with two endothermic peaks exhibited high proton conductivity. The high proton conductivity is related to the stability of the polymer. The number-average molecular weight also contributed to the stability of the polymer.
AB - We synthesized seven partially protonated poly(aspartic acids)/sodium polyaspartates (P-Asp) with different average molecular weights to study their proton transport properties. The number-average degree of polymerization (DP) for each P-Asp was 30 (P-Asp30), 115 (P-Asp115), 140 (P-Asp140), 160 (P-Asp160), 185 (P-Asp185), 205 (P-Asp205), and 250 (P-Asp250). The proton conductivity depended on the number-average DP. The maximum and minimum proton conductivities under a relative humidity of 70% and 298 K were 1.7 · 10-3 S cm-1 (P-Asp140) and 4.6 · 10-4 S cm-1 (P-Asp250), respectively. Differential thermogravimetric analysis (TG-DTA) was carried out for each P-Asp. The results were classified into two categories. One exhibited two endothermic peaks between t = (270 and 300) °C, the other exhibited only one peak. The P-Asp group with two endothermic peaks exhibited high proton conductivity. The high proton conductivity is related to the stability of the polymer. The number-average molecular weight also contributed to the stability of the polymer.
KW - Effect of molecular weight
KW - Poly(aspartic acid)
KW - Proton conduction
UR - http://www.scopus.com/inward/record.url?scp=79151482848&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79151482848&partnerID=8YFLogxK
U2 - 10.1016/j.jct.2010.11.016
DO - 10.1016/j.jct.2010.11.016
M3 - Article
AN - SCOPUS:79151482848
SN - 0021-9614
VL - 43
SP - 613
EP - 616
JO - Journal of Chemical Thermodynamics
JF - Journal of Chemical Thermodynamics
IS - 4
ER -