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1534418 
Journal Article 
Controllable synthesis of three kinds of zinc borates and flame retardant properties in polyurethane foam 
Cui, Yao; Liu, X; Tian, Y; Ding, Na; Wang, Z 
2012 
Yes 
Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757 
414 
274-280 
WOS:000312472000037 
Depending on the molar ratios of ZnO:B2O3:H2O, zinc borates
can be classified into many kinds of categories. In this paper, we successfully synthesized three
kinds of zinc borates (2ZnO center dot 3B(2)O(3)center dot 7H(2)O, 2ZnO center dot 3B(2)O(3)
center dot 3.5H(2)O and 3ZnO center dot 3B(2)O(3)center dot 5H(2)O) by controlling the reaction
conditions, using Na2B4O7 center dot 10H(2)O, H3BO3 and Zn(NO3)(2)center dot 6H(2)O as the
reactants. These three zinc borates transform with each other if the reaction conditions were
appropriately controlled. The morphologies of three products are peculiar. The synthesized 2ZnO
center dot 3B(2)O(3)center dot 3.5H(2)O is anomalous spheric-like or flaky, 3ZnO center dot 3B
(2)O(3)center dot 5H(2)O is flower-like, and 2ZnO center dot 3B(2)O(3)center dot 7H(2)O is club-
shaped. According to the thermodynamic performance of three kinds of zinc borates, we selected
2ZnO center dot 3B(2)O(3)center dot 3.5H(2)O which had the best flame retardant properties, then
doped it into the polyurethane to synthesize polyurethane/zinc borate materials. The maximum
decomposition temperature of the polyurethane foam doped with zinc borate was increased by 54
degrees C before 300 degrees C. Furthermore, the maximum decomposition temperature was increased
by 104 degrees C after 400 degrees C. (C) 2012 Elsevier B.V. All rights reserved. 
Zinc borate; Controllable synthesis; Polyurethane; Flame retardancy