title: Property enhancement of soy protein isolate-based films by introducing POSS.
abstract: To enhance the mechanical and water-resistant properties of soy protein isolate (SPI) based films, hydrophobic TriSilanolPhenyl polyhedral oligomeric silsesquioxanes (POSS) was incorporated to modify the SPI films. POSS has three SiOH groups in a molecular, which is employed to cross-link SPI with the help of 3-glycidoxypropyltrimethoxysilane (GPTMS). POSS is a structure of eight phenol groups, playing a critical role in improving the physical and mechanical properties. The X-ray diffraction (XRD) and attenuated total reflectance (ATR) Fourier transform infrared spectroscopy (FT-IR) were used to characterize the films. The degree of reaction of SiOH groups in the POSS was estimated to be 53.0% according with the absorbance of ATR FT-IR spectra. Although the elongation at break was reduced by 52.6%, the tensile modulus, tensile strength and 10% offset yield strength were significantly increased by 86.6%, 34.0% and 56.8%, respectively, due to the cross-linking reactions among SPI, GPTMS and POSS. The results of water-resistant tests showed that the 24-hour water absorption was dramatically reduced by 54.7%.
authors.affiliation: Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA.
authors.forename: Changlei
authors.initials: C
authors.lastname: Xia
authors.affiliation: MOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, MOE Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China. Electronic address: zhangshifeng2013@126.com.
authors.forename: Shifeng
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA. Electronic address: Sheldon.Shi@unt.edu.
authors.forename: Sheldon Q
authors.initials: SQ
authors.lastname: Shi
authors.affiliation: Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA.
authors.forename: Liping
authors.initials: L
authors.lastname: Cai
authors.affiliation: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA.
authors.forename: Andres C
authors.initials: AC
authors.lastname: Garcia
authors.affiliation: Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA.
authors.forename: Hussain R
authors.initials: HR
authors.lastname: Rizvi
authors.affiliation: Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203, USA; Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA.
authors.forename: Nandika A
authors.initials: NA
authors.lastname: D'Souza
mesh_terms: D057927:Hydrophobic and Hydrophilic Interactions; D008422:Materials Testing; D055595:Mechanical Phenomena; D017646:Organosilicon Compounds / Q000737:chemistry*; D030262:Soybean Proteins / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D017646:Organosilicon Compounds; D030262:Soybean Proteins; C521417:polyhedraloligosilsesquioxane
keywords: Film; Mechanical properties; POSS; Soy protein isolate; Water absorption