Coupling agent-modified corn stalk cellulose/used rubber powder composites

Abstract

Used rubber powder was reinforced by corn stalk cellulose to prepare corn stalk cellulose/used rubber powder composites, and the coupling agents 3-mercaptopropyl trimethoxysilane (KH590), r-aminopropyltriethoxysilane (KH550), isopropyl dioleic (dioctylphosphate) titanate (HY101) and bis-(γ-triethoxysilylpropyl)-tetrasulfide (Si69) were used to modify the interphase between used rubber powder and corn stalk cellulose. The effects of corn stalk cellulose and coupling agent on the mechanical properties, thermal properties, interfacial morphology and structure of the composites were investigated, respectively. Results showed that the addition of corn stalk cellulose could effectively increase mechanical properties of the composites. Compared with untreated composites, the interfacial bonding between corn stalk cellulose and used rubber powder was significantly improved by the coupling modification treatment; while, mechanical properties, thermal properties, and compatibility of modified composites were further improved. On the whole, Si69 showed the best coupling modification effect, followed by KH590, then KH550 and HY101 in the case of coupling agent content, of which was all 6% of corn stalk cellulose content.