Properties of Polypropylene Composites Filled with Layer-by-layer Assembly Modified Sisal Fiber
FENG Weili1, KANG Xinglong2, LIU Yan2, LU Zhehong2, LIU Baoying1, FANG Xiaomin2, DING Tao2
1 Institute of Functional Polymer Composites, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China 2 Henan Engineering Laboratory of Flame-Retardant and Functional Materials, Henan University, Kaifeng 475004, China
Abstract: Sisal fibers (SF) were coated by amino functionalized nano-silica (RNS-A) and ammonium polyphosphate (APP) through layer-by-layer (LBL) assembly method, and polypropylene (PP) composites filled with sisal fiber were prepared by melt blending. The combustion behavior of composites was studied by cone calorimeter test (Cone),the thermal stability of composites was studied by thermogravimetric analysis (TG/DTG), the morphology of carbon residue was observed by scanning electron microscopy (SEM), the mechanical properties of composites were investigated by universal mechanical tester, and the effect of modified fiber on the rheological behavior of composite materials was investigated with a rotating rheometer. The results showed that compared with the PP/SF system, the peak heat release rate (PHRR) of PP/ mSF composite was reduced to 324.9 MJ/m2, a decrease of 28.4%; the final amount of carbon residue was increased to 7.1%, increased by 54.3%, the structure of the carbon layer after combustion was relatively complete, but the tensile strength of the system decreased to some extent. Compared with pure PP, both PP/SF and PP/mSF composites showed high dynamic modulus and complex viscosity.
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2021, Vol. 35 
