Effect of Microfibrillated Cellulose Loading on Physical Properties of Starch/Polyvinyl Alcohol Composite Films
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https: //doi. org/10.1007/s11595-020-2326-1
Effect of Microfibrillated Cellulose Loading on Physical Properties of Starch/Polyvinyl Alcohol Composite Films TIAN Yu, ZHU Puxin, ZHOU Mi*, LIN Yi, CHENG Fei
(College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, China)
Abstract: The starch/polyvinyl alcohol (PVA)/ microfibrillated cellulose (MFC) composite films were prepared using solution casting method after adding MFC into starch/PVA blend matrix. The effects of MFC content on the mechanical properties of starch/PVA composite films were investigated. As MFC content increases, the elongation at break and tensile strength increase firstly and then decrease. When the content of MFC is 2wt%, the tensile strength is 26.6 MPa and reaches the maximum. Through Fourier transform infrared (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA), good dispersion of MFC in starch/PVA matrix at the loading of 2wt%, lower crystallinity of the starch/PVA/ MFC films in comparison with starch/PVA blend and the effect of glass transition temperature increasing with MFC content from 0.5wt% to 4wt% can be found observed. And, incorporating MFC does not change the composition and crystal structure of the starch/PVA composite films. Thus, the reinforcing mechanism for the improvement of mechanical properties is attributed to the homogeneous dispersion of MFC with large aspect ratio, good compatibility and interfacial interactions between starch/PVA blend matrix and MFC. Key words: biopolymers; fillers; blends; composites; mechanical properties
1 Introduction At present, petro-based polymers are used widely in daily life, such as in food industry, biomedical field and agriculture. However, the disposal of waste petrobased polymers has become a heavy environmental pollution, because of their non-recyclability, nonbiodegradability and lack of environmental sustainability[1,2]. Thus, degradable materials have drawn great attention among the public since they have a higher degradation rate than petroleum-derived plastics[3-5]. Among the natural biopolymers, starch has become increasingly popular with researchers all over the world due to its wide availability, good film-forming, low cost and biodegradability[6-8]. Furthermore, starch has been widely used in paper-making, textiles, foods, medicine, and other industrial fields[9-12]. However, the low water
© Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Sept. 12, 2019; Accepted: Nov. 27, 2019) TIAN Yu(田雨): E-mail:[email protected] *Corresponding author: ZHOU Mi(周密): Ph D; E-mail: [email protected] Funded by the National Natural Science Foundation of China (51903178) and the Graduate Program Construction Project Funding of Sichuan University(2017KCSJ036)
resistance due to its inherent water sensitivity and poor mechanical properties of starch films as compared to conventional synthetic polymers limit its industrial application [13]. Therefore, some effi
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