Simultaneously Toughening and Strengthening Soy Protein Isolate-Based Composites via Carboxymethylated Chitosan and Halloysite Nanotube Hybridization

Xiaorong Liu; Haijiao Kang; Zhong Wang; Wei Zhang; Jianzhang Li; Shifeng Zhang

doi:10.3390/ma10060653

Simultaneously Toughening and Strengthening Soy Protein Isolate-Based Composites via Carboxymethylated Chitosan and Halloysite Nanotube Hybridization

Materials (Basel). 2017 Jun 14;10(6):653. doi: 10.3390/ma10060653.

Authors

Xiaorong Liu¹, Haijiao Kang², Zhong Wang³, Wei Zhang⁴, Jianzhang Li⁵, Shifeng Zhang⁶

Affiliations

¹ MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. happyrong1993@bjfu.edu.cn.
² MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. khj0339@bjfu.edu.cn.
³ MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. wangzhong@bjfu.edu.cn.
⁴ MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. zhangweishe@126.com.
⁵ MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. lijzh@bjfu.edu.cn.
⁶ MOE Key Laboratory of Wood Material Science and Utilization, Beijing Key Laboratory of Wood Science and Engineering, College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, China. shifeng.zhang@bjfu.edu.cn.

Abstract

Chemical cross-linking modification can significantly enhance the tensile strength (TS) of soy protein isolate (SPI)-based composites, but usually at the cost of a reduction in the elongation at break (EB). In this study, eco-friendly and high-potential hybrid SPI-based nanocomposites with improved TS were fabricated without compromising the reduction of EB. The hybrid of carboxymethylated chitosan (CMCS) and halloysite nanotubes (HNTs) as the enhancement center was added to the SPI and 1,2,3-propanetriol-diglycidyl-ether (PTGE) solution. The chemical structure, crystallinity, micromorphology, and opacity properties of the obtained SPI/PTGE/HNTs/CMCS film was analyzed by the attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and UV-Vis spectroscopy. The results indicated that HNTs were uniformly dispersed in the SPI matrix without crystal structure damages. Compared to the SPI/PTGE film, the TS and EB of the SPI/PTGE/HNTs/CMCS film were increased by 57.14% and 27.34%, reaching 8.47 MPa and 132.12%, respectively. The synergy of HNTs and CMCS via electrostatic interactions also improved the water resistance of the SPI/PTGE/HNTs/CMCS film. These films may have considerable potential in the field of sustainable and environmentally friendly packaging.

Keywords: 1,2,3-propanetriol-diglycidyl-ether; carboxymethylated chitosan; cross-linking interaction; halloysite nanotubes; soy protein isolate.