In this study, the atomistic-scale mechanisms affecting the interfacial stability of a thermoplastic polymer/graphene oxide interface are investigated using molecular dynamics simulations. Different combinations of thermoplastic polymers (polyethersulfone (PES) and polyetherimide (PEI)) and graphene oxides modified with –O–, –OH, and –COOH are prepared. PES is found to be more strongly stabilized with modified/functionalized graphene oxide in the order of –COOH, –OH, –O–, which is opposite to the stability order of PEI. Our results suggest that these orders of stability are governed by a balance between the following two factors resulting from electrostatic interactions: (1) atoms with a strong charge bias attract each other, thereby stabilizing the interface; (2) the excluded-volume effect of the functional groups on graphene oxide destabilizes the interface by preventing - stacking of aromatic rings.

No abstract

No abstract

〒278-8510 千葉県野田市山崎2641) 2 正会員 (株)日水コン 名古屋下水道部 技術第一課 (〒456-0002 愛知県名古屋市熱田区金山町1-7-5) 3 正会員 博(工) 東京理科大学准教授 理工学部土木工学科 (〒278-8510 千葉県野田市山崎2641) 4 非会員 東京理科大学 理工学部土木工学科(同上)Recent extreme flood affected huge flood disaster with a large number of levee breaches which were mainly caused by overflow erosion. For increasing the resistance of levee to overflow erosion with attention to fine fraction of levee materials, we examine the resistance of armored and GRS (Geosynthetic-Reinforced Soil) levees. Various laboratory tests were conducted to evaluate the resistance of this method to overflow erosion. The results indicated that 1) the resistance of armored and GRS levees have high resistance against overflow erosion with the increase of fine fraction of levee materials mainly due to low permeability and high cohesion of fine sediment and 2) the GRS levee with fine sediment maintained the height of the levee during a longer duration than that with sand.

No abstract