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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/10629

Title: Proton transport properties of poly (aspartic acid) with different average molecular weights
Authors: Nagao, Yuki
Imai, Yuzuru
Matsui, Jun
Ogawa, Tomoyuki
Miyashita, Tokuji
Keywords: proton conduction
effect of molecular weight
poly (aspartic acid)
Issue Date: 2010-11-30
Publisher: Elsevier
Magazine name: The Journal of Chemical Thermodynamics
Volume: 43
Number: 4
Start page: 613
End page: 616
DOI: 10.1016/j.jct.2010.11.016
Abstract: 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> (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 270 and 300 ℃, 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.
Rights: NOTICE: This is the author's version of a work accepted for publication by Elsevier. Yuki Nagao, Yuzuru Imai, Jun Matsui, Tomoyuki Ogawa, Tokuji Miyashita, The Journal of Chemical Thermodynamics, 43(4), 2010, 613-616, http://dx.doi.org/10.1016/j.jct.2010.11.016
URI: http://hdl.handle.net/10119/10629
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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