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Formation of o ‐Phenylenediamine Oligomers and their Self‐Assembly into One‐Dimensional Structures in Aqueous Medium
Author(s) -
Sun Xuping,
Dong Shaojun,
Wang Erkang
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500502
Subject(s) - aqueous medium , schematic , aqueous solution , molar ratio , materials science , chemistry , polymer chemistry , chemical engineering , crystallography , organic chemistry , electronic engineering , engineering , catalysis
Summary: Uniform one‐dimensional (1D) structures of o ‐phenylenediamine (oPD) oligomers are obtained by direct mix of AgNO 3 and oPD aqueous solutions at room temperature. The formation of the 1D structures involves two stages: (1) oxidation of oPD by AgNO 3 , yielding individual oPD oligomers; and (2) self‐assembly of the oligomers, forming the 1D structures. Upon decreasing medium pH, the 1D structures can break‐apart to form individual oligomers, or vice versa. It is also found that both the concentration and molar ratio of reactants can influence the morphology of the structures thus formed.Schematic illustration of the formation mechanism of 1D structures from oPD and AgNO 3 , and energy‐dispersed spectrum of the precipitate.