Preparation and Properties of a Transparent and Fire-retardant Nanocomposite Film of NFC/Nanoclay

doi:10.11901/1005.3093.2017.732

Chinese Journal of Materials Research

2018, Vol. 32

Issue (11): 874-880 DOI: 10.11901/1005.3093.2017.732

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Preparation and Properties of a Transparent and Fire-retardant Nanocomposite Film of NFC/Nanoclay

Siyi MING¹, Gang CHEN¹, Junfang YAN¹, Jiahao HE¹, Jiatian ZHU¹, Yingyao LIU¹, Zhiqiang FANG^1,²(

)

1 State Key Laboratory of Pulp and Paper Engineering, South China Institution of Collaborative Innovation, South China University of Technology, Guangzhou 510640, China
2 National Engineering Research Center of Neat-Net-Shape Forming for Metallic Materials, The Key Laboratory of High Efficient Neat-Net-Shape Forming Technology and Equipments for Metallic Materials, Ministry of Education, South China University of Technology, Guangzhou 510640, China

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Siyi MING, Gang CHEN, Junfang YAN, Jiahao HE, Jiatian ZHU, Yingyao LIU, Zhiqiang FANG. Preparation and Properties of a Transparent and Fire-retardant Nanocomposite Film of NFC/Nanoclay. Chinese Journal of Materials Research, 2018, 32(11): 874-880.

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Abstract

A transparent and fire-retardant nanocomposite film of NFC/nanoclay was prepared in order to realize the compatibility between high transparency and fire retardance. Firstly, the clay was exfoliated from lamellar structure into monolayer structure to enhance its uniformity in thickness; secondly, during the fabrication of nanocomposite film, the stability of monolayer clay suspension is enhanced by taking advantage of the excellent steric hindrance of NFC in water. Consequently, the individual monolayer nanoclay is self-assembled into nanocomposite film with well-ordered mortar-and-brick structure, which facilitates the transmission of light through the hybrid film. The structure, thermal stability, and flammability of the nanocomposite film were characterized by means of SEM, XRD, and TGA. The results show that as the mass ratio of monolayer clay to NFC is 1:1, the nanocomposite film exhibits ca 90% transparency and a limiting oxygen index over 60%.

Key words: surface and interface in the materials nanocomposite film nanofibrillated cellulose nanoclay transparency fire retardancy

Received: 12 December 2017

ZTFLH:

O484

Fund: Supported by Young Scientists Fund of the National Natural Science Foundation of China (No. 31700508), Natural Science Foundation of Guangdong Province (No. 2017A030310635), Open Funds of National Engineering Research Center of Near-net-shape Forming for Metallic Materials (No. 2016006)

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	Siyi MING
	Gang CHEN
	Junfang YAN
	Jiahao HE
	Jiatian ZHU
	Yingyao LIU
	Zhiqiang FANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.732 OR https://www.cjmr.org/EN/Y2018/V32/I11/874

Fig.1 AFM height image of NFC-dispersed monolayer clay nanoplatelet suspension (a) and AFM line scan of monolayer clay nanoplatelets (b)

Fig.2 Visual appearance of different clay hybrid films (a) mass ratio of monolayer clay nanoplatelet and NFC at 1; (b) mass ratio of clay powder and NFC at 1. Note that the hybrid film size: 10 cm×10 cm

Fig.3 Cross-sectional SEM images of hybrid film (a) ,top-view SEM images images of hybrid film (b), XRD patterns of pure clay powder (c) and hybrid film with the mass ratio 1:1 of monolayer clay nanoplatelet and NFC (d

Fig.4 (a) TG and (b) dTG plots of NFC and hybrid films with the mass ratio of monolayer clay nanoplatelet and NFC at 1 in nitrogen

Fig.5 Time-laps series of photographs depicting the fire-blocking properties of the hybrid films (the mass ratio of monolayer clay nanoplatelet and NFC at 1, thickness 30 μm) upon exposure to a butane gas torch (temperature ca. 1300℃). Note that the material is still translucent and fully self standing. Flames cannot be observed

Fig.6 SEM images showing transparent and flame retardant hybrid film microstructures with the mass ratio of monolayer clay nanoplatelet and NFC at 1 after burning (a) Cross-sectional images of residues that are collected after vertical testing; (b) Top-view images of residues collected after vertical testing; (c), (d) Cross-sectional images of residues that are collected after vertical testing. Square with red dots in each image is the EDX mapping of elemental Si for monolayer clay nanoplatelets

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