Preparation, Structure and Properties of Strong, Transparent Cellulose Materials†

doi:10.7503/cjcu20180177

Abstract

Abstract:

A strong, transparent cellulose material was prepared by a two-step method(delignification and pressure drying). The obtained cellulose material not only exhibited a highest transmittance of 68%(600 nm) and a transmission haze of 95%, but also has a maximum tensile strength of 362 MPa and an elastic modulus of 9.5 GPa. Scanning electron microscope(SEM), X-ray diffraction(XRD), thermal gravimetric analyzer(TGA), ultraviolet-visible(UV-Vis) spectrophotometer, and tensile tester were applied to analyze the structure, mechanical and optical properties, thermal stability, and crystallinity of cellulose material. and the underlying principles for the optical transparency and strong tensile strength of the cellulose material was confirmed based on above characterizations.

Key words: Strong tensile strength and transparency, Cellulose material, Aligned structure, Fir wood, Delignification, Mechanical property

CLC Number:

O631
TB34

TrendMD:

LIU Yu,CHEN Gang,ZHU Jiatian,CHEN Wenjin,HU Wen,LIU Yingyao,FANG Zhiqiang. Preparation, Structure and Properties of Strong, Transparent Cellulose Materials^†[J]. Chem. J. Chinese Universities, 2018, 39(10): 2298.

Figures/Tables 8

Fig.1 Preparation of high strength and transparent cellulose materials

Fig.2 SEM images of the cross section(A—C) and the surface(D—F) of the wood chips(A, D), the bleached wood chips(B, E) and the whole cellulose material(C, F)

Fig.3 Stress-strain curves of the natural wood(a), cellulose material(b) and the paper from isotropic wood fiber(c)(A) and stress-strain curves of the high-strength transparent cellulose material in the latitude direction(B)

Fig.4 Transmittance and haze of high-strength transparent cellulose material

Table 1 Lignin content, whiteness and transmittance of wood chips, cooked wood chips, bleached wood chips and high-strength transparent cellulose material

Complex	Natural wood	Wood chips after cooking	Wood chips after bleaching	Cellulose material
Lignin content(%)	25.5	3.9	0.2	0.2
Whiteness(%)	42	38.2	70.5	74.6
Transmittance(%)	0	0	35.7	68

Fig.5 Light scattering effect of high-strength transparent cellulose material

Fig.6 TG(A) and DTG(B) curves of nature wood(a) and high-strength transparent cellulose material(b)

Fig.7 XRD pattern of high-strength transparent cellulose material

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