Preparation of Lignin/ZnO Composite Nanoparticles and Its Application in Waterborne Polyurethane†

doi:10.7503/cjcu20180128

Abstract

Abstract:

A series of lignin/zinc oxide(LQAs/ZnO) composites with different lignin content was prepared through a precipitation method using quaternized alkali lignin(LQAs), zinc acetate and sodium hydroxide as raw materials. The results of X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and ultraviolet-visible spectroscopy(UV-Vis) demonstrated that the as-prepared LQAs/ZnO composites exhibited a hybrid structure and the microstructure was significantly influenced by the dosage of NaOH. The UV-absorption performance of LQAs/ZnO composites enhanced remarkably compared with pure ZnO. In addition, the optical and mechanical properties of waterborne polyurethane(WPU) films doped with LQAs/ZnO composites were investigated. The tensile strength and the elongation at break of WPU films blended with LQAs/ZnO composites were 81.5% and 10.9%, respectively, higher than those of pure WPU films. The tensile strength and the elongation at break of the WPU composite films were maintained above 25 MPa and 360% by a 192 h of UV-aging test. LQAs/ZnO composites could effectively enhance the UV shielding performance and the anti-ultraviolet aging ability of WPU.

Key words: Lignin, Zinc oxide, Composite particle, Waterborne polyurethane

CLC Number:

O636.2

TrendMD:

FU Fangbao,WANG Huan,ZHONG Ruisheng,QIU Xueqing,YANG Dongjie. Preparation of Lignin/ZnO Composite Nanoparticles and Its Application in Waterborne Polyurethane^†[J]. Chem. J. Chinese Universities, 2018, 39(10): 2335.

Figures/Tables 11

Scheme 1 Synthetic procedure of LQAs/ZnO composites

Fig.1 FTIR spectra of AL(a) and LQAs(b)

Fig.2 XRD patterns of LQAs/ZnO composite and ZnO

Fig.3 SEM images of ZnO-0.8(A), ZnO-1.2(B), ZnO-1.6(C) and ZnO-2.0(D)Inset is the image at higher magnification.

Fig.4 SEM images of LQAs/ZnO-0.8(A), LQAs/ZnO-1.2(B), LQAs/ZnO-1.6(C) and LQAs/ZnO-2.0(D) Insets are the higher magnification images of (A)—(D), respectively.

Fig.5 TEM images of LQAs/ZnO-0.8(A), LQAs/ZnO-1.2(B), LQAs/ZnO-1.6(C) and LQAs/ZnO-2.0(D)

Fig.6 TG curves of LQAs/ZnO compositesa. ZnO-2.0; b. LQAs/ZnO-0.8; c. LQAs/ZnO-1.2;d. LQAs/ZnO-1.6; e. LQAs/ZnO-2.0.

Fig.7 UV-Vis DSR spectra of LQAs/ZnO, ZnO and LQAsa. ZnO-2.0; b. LQAs; c. LQAs/ZnO-0.8;d. LQAs/ZnO-1.2; e. LQAs/ZnO-1.6; f. LQAs/ZnO-2.0.

Fig.8 UV light transmittance curves of samplesa. WPU, UPF=5.21; b. WPU-LQAs/ZnO-2.0, UPF=38.55; c. WPU-LQAs/ZnO-1.6, UPF=38.19; d. WPU-LQAs/ZnO-1.2, UPF=32.46; e. WPU-LQAs/ZnO-0.8, UPF=31.93; f. WPU- ZnO-2.0, UPF=18.18.

Fig.9 Mechanical properties of samples during UV aging process(A) Elongation at break vs. UV radiation time; (B) tensile strength at break vs. UV radiation time.

Fig.10 SEM images of WPU(A), WPU- ZnO-2.0(B), LQAs/ZnO-2.0(C) and WPU- LQAs/ZnO-2.0(D)

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