High Value Recycling Of Recycled High Impact Polystyrene

This paper studies the oxidation that occur in the r-HIPS throughingcompared the recycled high impact polystyrene material(r-HIPS) and new materials for high impact polystyrene(HIPS).Based on oxidation degradation of r-HIPS, we respectively used MPBO and MPBO/SEBS on r-HIPS for chain extender and increased toughness, zhihou and used double Malay n Asia Amine(BMI), and BMI/SBS and BMI/SEBS on r-HIPS for chain extender and increased toughness, that will double bond introduced to HIPS of molecular in the, to reached the effect of increased toughness. Mixed materials melt blended in a twin screw extruder, get chained high impact styrene(c-HIPS), through mechanical properties, GPC, FTIR, SEM, crosslink density, MFR, DMA and other test methods were studied.The results are as follows:(1) By the mechanical properties, GPC, SEM, DMA and crosslink density test of new and high impact polystyrene showed that: the mechanical properties of r-HIPS decreased, which decreased the impact strength; r-HIPS molecular chain scission occurs, uneven distribution of the molecular chain; grafted chain scission occurs r-HIPS interface between the two phases; r-HIPS in the degradation process, mainly characterized by chain scission reactions. FTIR showed that: carboxyl and hydroxyl functional groups in r-HIPS are increase.(2) r-HIPS / MPBO modified material: When MPBO content 1.3%, c-HIPS impact strength, tensile strength, elongation at break significantly improved; the MFR fristly increased then decreased with the increase MPBO, when MPBO content 1.3% time, MFR minimum; GPC and FT-IR test showed that r-HIPS's carboxyl group and MPBO's oxazoline ring-opening reaction form amide group; seen by the SEM, PB dispersed phase distribution uniform dispersion decreases, there occurs a network structure with fibrous stringiness evident on the substrate, large plastic deformation occurs PS matrix phase, increasing the interfacial bond strength. r-HIPS / SEBS / MPBO in SEM showed r-HIPS and SEBS poor compatibility, mechanical properties not significantly improved.(3) In the r-HIPS/ BMI modified material: when BMI content 0.7%,the impact strength highest; when BMI content 0.7%, MFR minimum 4.00 g / 10min; GPC and FT-IR test BMI showed a hydroxyl group and the double bond in r-HIPS ring-opening reaction of more ether linkages, so that the molecular chain growth; DMA analysis showed that the chain extender and the toughness of PB phase increases.In the modified materials r-HIPS / BMI / SEBS: when BMI content is 0.7%, SEBS content is 10%, the overall performance of the material to achieve optimal; the MFR have a good fluidity;observation of c-HIPS impact fracture, brittle fracture in liquid nitrogen section, stretching cross-section SEM discovery that BMI / SEBS add to r-HIPS more good than simply added SEBSor BMI to r-HIPS,r-HIPS / BMI / SEBS toughness good than r-HIPS / SEBS toughness; crosslink density and DMA analysis show that, BMI played a role as a bridge in the SEBS and r-HIPS in the form of chemical bonds connected, so that the material increased toughness.In the modified materials r-HIPS / BMI / SBS: when BMI content is 0.7%, SBS content is 10%, materials overall performance achieve to optimal; seen from the DMA, BMI between r-HIPS and SBS no chemical reaction.