Scrap leather fibers functionalization by active silane for preparation of covalent-integrated PLA c

• 出 处: 2012 Postdoctoral Symposium of China on Materials Science &a
• 发表日期: 2012年期

　　Scrap leather fibers (SLFs) modified with the active silane containing epoxide groups (GPTMS) was incorporated into poly (lactic acid) (PLA) modified by vinyl trimethoxysilane was prepared for bio-composites by solvent compounding technology in this article.This study examined the effects of silane coupling agents on the structures of PLA and SLFs molecules, and the thermal properties, impacting strength, tensile strength and thermal stability of PLA/SLFs bi-composites also were measured.The results of fourier-transform infrared spectroscopy (FTIR) had proved that silane had been incorporated successfully to PLA and SLFs molecules by means of the solvent technology.Scanning electric microscopy (SEM) was used to investigate both the changes in shapes between the pristine SLFs and the treated SLFs and the microscopic structures of bio-composites.According to SEM results, it was shown that there were some significant differences between the untreated and treated SLFs, and a double continuous phase structure had occurred in PLA/SLFs bio-composite due to the excellent dispersion of SLFs in matrix.Differential scanning calorimetry (DSC) results displayed that the addition of SLFs into PLA had some significant effects on the crystallization behavior of PLA.However, Wide X-ray diffraction (WXRD) measurements had not significantly disrupted crystallization or altered the crystal structure within PLA.The addition of the treated SLFs into PLA resulted to the distinct improvement of the impact and tensile strengths.When the concentration of the treated SLFs was 15 pbw (parts by weight), the notched impact strength and tensile strengths of PLA/SLFs bio-composites were improved by 34.4% and 21.2% compared with the pristine PLA, respectively.Additionally, with increase of the modified SLFs content, the thermal stability of PLA/SLFs bi-composites was apparently improved.The macroscopic properties of bio-composites were found to be strongly dependent on their components, concentrations, dispersion and resulted morphological structures.