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Electrically Conductive Poly( DL ‐lactide)/Chitosan/Polypyrrole Complexes
Author(s) -
Wan Ying,
Fang Ya,
Hu Zhilin,
Wu Quan
Publication year - 2006
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.200600142
Subject(s) - polypyrrole , materials science , membrane , chitosan , polymer chemistry , miscibility , chemical engineering , percolation threshold , conductivity , conductive polymer , composite material , polymer , electrical resistivity and conductivity , polymerization , chemistry , biochemistry , electrical engineering , engineering
Summary: The fabrication of novel conductive poly( DL ‐lactide)/chitosan/polypyrrole complex membranes is reported. Using poly( DL ‐lactide)/chitosan blends as matrices and polypyrrole as a conductive component, several kinds of membranes with various compositions are prepared. A percolation threshold of polypyrrole as low as 1.8 wt.‐% is achieved for some membranes by controlling the chitosan proportion between 40 and 50 wt.‐%. SEM images exhibit that the membranes with a low percolation threshold show a two‐phase structure which consists of poly( DL ‐lactide) and chitosan phases. Dielectric measurements indicate that there is limited miscibility between the poly( DL ‐lactide) and chitosan but polypyrrole is nearly immiscible with the other two components. Based on the structural characteristics of the membranes, the polypyrrole particles are suggested to be localized at the interface between two phases.Dependence of conductivity of complex membranes on the PPy content. (○) PDLLA/PPy, (▪) PDLLA/ch(10)/PPy, (▵) PDLLA/ch(20)/PPy, (•) PDLLA/ch(30)/PPy, (□) PDLLA/ch(40)/PPy, and (▴) PDLLA/ch(50)‐PPy.