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Ultrafine nickel nanocatalyst-engineering organic layered double hydroxide towards super-efficiently fire-safe epoxy resin via interfacial catalysis

Abstract

Aiming to impart epoxy resin (EP) with super-efficient fire safety, organically modified layered double hydroxide (LDH-DBS) nanosheets were surface-assembled by ultrafine Ni(OH)2 nanocatalyst via the circular coordination-induced growth. The design of LDH-DBS@Ni(OH)2 was to exploit a spatial-dependent catalytic strategy to strengthening interfacial structure between LDH nanosheets and EP matrix during dynamic charring process. Adaquate characterizaitons verfied the susscessful preparation of LDH-DBS@Ni(OH)2 with Ni(OH)2 nanocrystals uniformly distributed on LDH nanosheets. LDH-DBS@Ni(OH)2 presented better nano-dispersion in EP matrix relative to LDH-DBS. Results illustrated that merely 3wt% LDH-DBS@Ni(OH)2 imparted EP matrix with UL-94 V-0. The peak heat release rate and total smoke prodcution at 200s were reduced by 60.6% and 66.5% respectively with the addition of 3wt% LDH-DBS@Ni(OH)2, accompanied by tremendously suppressed CO production. In parallel, the thermal degradation analysis revealed that the interfacial growth of Ni(OH)2 nancatalyst resulted in the significant reduction of volatiles including CO, aliphatic and aromatic compounds. The further mechanism investigation by dynamic charring analysis revealed the remarkable contribution of interfacial-charring catalysis to the reinforcement of intumescent char structure and fire safety. In perspective, the interface-catalysis assembly of nanomaterials without traditional fire-retardant elements opened a novel and up-scaling window toward super-efficient fire safety.

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Publication details

The article was received on 28 Jan 2018, accepted on 06 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA00910D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Ultrafine nickel nanocatalyst-engineering organic layered double hydroxide towards super-efficiently fire-safe epoxy resin via interfacial catalysis

    Z. Li, J. Zhang, F. DUFOSSE and D. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00910D

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