Volume 5, Issue 7 p. 2348-2353
Full Paper

Synthesis and Properties of Waterborne Polyurethane Modified with Guar Gum Polysaccharide

Prof. Jianzhong Ma

Prof. Jianzhong Ma

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Prof. Jianhua Zhou

Corresponding Author

Prof. Jianhua Zhou

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Geng Liu

Geng Liu

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Zongwu Luo

Zongwu Luo

College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Dr. Kai Yan

Dr. Kai Yan

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Hongtao Yao

Hongtao Yao

College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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Prof. Xiang Li

Prof. Xiang Li

College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, 710021 China

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First published: 19 February 2020
Citations: 5

Graphical Abstract

Guar gum modified waterborne polyurethane (GWPU) was prepared by the prepolymerization method using isophorone diisocyanate (IPDI) and difunctional poly(ϵ-caprolactone) diol (PCL) as the hard and soft segment, guar gum (GG) as an internal crosslinking agent. The GG content had an obvious effect on the GWPU's performance. GWPU exhibited improvement in tensile strength, water resistance and thermal stability compared to the unmodified waterborne polyurethane.

Abstract

Guar gum modified waterborne polyurethane (GWPU) was synthesized by the prepolymerization method using guar gum (GG) as an internal crosslinking agent. The influence of the GG content on emulsion and film properties was investigated. The Fourier transform infrared (FT-IR) results showed GG was successfully introduced into the polyurethane. The emulsion particles presented spherical morphology with an average diameter of about 40 nm characterized by transmission electron microscopy (TEM). The particle size increased with the increase of the amount of GG using dynamic laser scattering (DLS). The tensile strength of GWPU film was increased by 31.8% when the incorporated content of GG was only 0.3 wt%. With increasing GG content, the elongation at break and crystallinity of GWPU film decreased. The thermal stability increased initially as GG content increased, then decreased. Furthermore, the water resistance of GWPU was observably improved.