Preparation And Degradation Of SEBS/HA Composites

SEBS elastomer is one of the earliest elastomers in industrial production.Because of its special molecular structure,it has good performance without cross-linking and is widely used in various fields.Humic acid(HA)is a kind of polymer mixture widely existing in nature,which has good degradation performance and has improved effect on plants,soil,etc.In this paper,SEBS/ HA composites were prepared by mixing method.Than,by characterizing the mechanical properties,weight,pH,stacking angle,initial flow angle and surface morphology of the composites,the UV degradation,hydrolysis,microbial degradation and sand fixation were studied.The purpose is to obtain the degradation performance of SEBS/HA composite and its impact on soil,studies its application value.After analysis and testing,the following conclusions are drawn:(1)During the ultraviolet light irradiation,the curves of elongation at break and tensile strength show an oscillating shape.It indicates that there are many variables in the degradation process,including: Degradation of humic acid not reacted with compatibilizer,Cross-linking of humic acid degradation products with SEBS molecular chain,Degradation of SEBS molecular chain,Cross-linking of humic acid degradation products and SEBS degradation products with SEBS molecular chain,Degradation of benzene ring in SEBS molecular chain,Degradation of the humic acid reacted with the compatibilizer.(2)In the ultraviolet light irradiation of 2310 h,SEBS/HA has cross-linking and degradation at the same time,and the cross-linking effect is greater than the degradation.In addition,SEBS molecular chain and humic acid were degraded and crosslinked respectively.(3)During microbial degradation,the curves of elongation at break and tensile strength show an oscillating shape.It indicates that there are many variables in the degradation process,including: Degradation of humic acid not reacted with compatibilizer,Cross-linking of humic acid degradation products with SEBS molecular chain,degradation of benzene ring of SEBS molecular chain,and degradation of SEBS molecular chain.(4)Trichoderma had the greatest degradation of SEBS matrix,followed by Aspergillus fumigatus,and Pseudomonas fluorescens had little effect on the degradation of SEBS matrix.(5)During water environment impact test,the curves of pH show an oscillating shape.It indicates that there are many variables in the degradation process,including: Migration and dissolution of humic acid,ozone degradation of humic acid,hydrolysis of humic acid,reaction of humic acid with substances in water,dynamic equilibrium in alkaline water,etc.(6)In the water environment impact test,the addition of SEBS/HA slightly reduces the pH of neutral and acidic water,but increases the pH of alkaline water.The pH of neutral water and acidic water was mainly affected by the hydrolysis of humic acid.In alkaline water,pH is mainly affected by the reaction of humic acid with substances in water.(7)In the sand fixation experiment,humic acid can be removed from the composite material and coated on the sand,increasing the friction coefficient between the sand.(8)After ammoniated,humic acid reacts with the compatibilizer,resulting in less migration from the composite in water environment and sand landfill.The influence on pH,stacking Angle and initial flow Angle of water is less than that of unammoniated humic acid.(9)After ammoniation,the degree of photodegradation and microbial degradation of SEBS/HA was decreased.