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Preparation of Stable Colloidal Crystals and Macroporous Materials Using Diazoresin as a Thermosetting Agent
Author(s) -
Cong Hailin,
Cao Weixiao
Publication year - 2004
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.200300104
Subject(s) - colloid , thermosetting polymer , materials science , molecule , ionic bonding , chemical engineering , covalent bond , thermal decomposition , polymer chemistry , hydrofluoric acid , nanoparticle , tetrahydrofuran , thermal treatment , organic chemistry , nanotechnology , chemistry , composite material , ion , engineering , metallurgy , solvent
Summary: Two kinds of stable colloidal crystals have been prepared from polymeric or SiO 2 colloids in the presence of diazoresin (DR) as a thermosetting agent combining thermal treatment. Following the decomposition of N 2 +groups of DR under heating, the ionic bonds between the DR molecules and colloids change to covalent bonds and the colloidal crystals become very stable toward ultrasonic washing. The colloids were then removed by tetrahydrofuran (THF) in the case of organics or by hydrofluoric acid (HF) for the inorganics to leave the macroporous DR materials.Reactions between the DR molecules and the colloids during thermal treatment.