Properties Of Waste ABS/HIPS Blends Modified By Ionic Crosslinking Compatibilization And Toughening

Acrylonitrile butadiene styrene(ABS)and high impact polystyrene(HIPS)were widely used in various electronic and electrical products as two kinds of excellent materials.However,with the rise of science and technology,a large number of electronic and electrical waste would be generated,resulting in a large number of waste ABS and HIPS plastics.If these waste plastics were discarded at will,it will not only cause a waste of resources,but also cause environmental pollution.In this paper,zinc dimethacrylate(ZDMA)was used to introduce ionic crosslinking into waste ABS/HIPS(rABS/rHIPS)blends for the first time.Under the initiation of peroxide initiator,ZDMA can generate free radicals.On the one hand,it can be polymerized in situ to form poly ZDMA(PZDMA),on the other hand,it can be grafted with polybutadiene(PB)in rABS and rHIPS.As ZDMA was an ionic compound,there were a lot of positive and negative ion pairs in its chemical structure.These ion pairs were close to each other and gather together due to electrostatic interaction,forming an ion to ground aggregation area on the surface of PZDMA.In this aggregation region,there was a very strong interaction between ion pairs,which led to a strong interaction between PZDMA particles and the main chain of polymer,and limited the movement of surrounding poly-ZDMA particles and the main chain of polymer,thus playing the role of ion crosslinking.It was characterized by Fourier transform infrared spectroscopy(FTIR),mechanical properties test,scanning electron microscopy(SEM)and dynamic mechanical analysis(DMA).On this basis,cis-1,4-polybutadiene rubber(BR)was added to modify rABS/rHIPS blends.On the one hand,the addition of cis-1,4-polybutadiene rubber can supplement the PB phase lost due to aging degradation in rABS/rHIPS blends.On the other hand,the addition of cis-1,4-polybutadiene rubber can also increase the intermolecular reaction,further promote the ionic crosslinking reaction and improve the phase compatibility of rABS/rHIPS blends.It was characterized by Fourier transform infrared spectroscopy(FTIR),mechanical properties test,scanning electron microscopy(SEM)and dynamic mechanical analysis(DMA).The results are as follows:(1)The mechanical properties of rABS/rHIPS/ZDMA blends were significantly improved compared with those of rABS/rHIPS/ZDMA blends without ZDMA.Especially when the content of ZDMA was 4 wt%,the properties of rABS/rHIPS/ZDMA blends were the best.The notched impact strength,tensile strength and elongation at break were 133 %,118 %and 117 % of rABS/rHIPS blends without ZDMA,respectively.Rheological tests showed that the introduction of ionic crosslinking can enhance the storage modulus and loss modulus of the materials,especially when the content of ZDMA was 4 wt%,the properties of the blends were the best,and the processing properties of the materials were improved.DMA test results showed that the storage modulus and loss modulus of rABS/rHIPS/ZDMA blends were significantly higher than those of rABS/rHIPS blends.FT-IR and crosslinking density test showed that ionic crosslinking occurred in rABS/rHIPS/ blends.The fracture surface morphology showed that the dispersion of polybutadiene(PB)in rABS/rHIPS/ZDMA blend was good after adding 4 wt% ZDMA,and the interface between rABS and rHIPS was fuzzy,which indicated that the compatibility of rABS/rHIPS blend was improved.(2)Further study showed that the mechanical properties of rABS/rHIPS/ZDMA/BR blends were significantly improved compared with rABS/rHIPS/ZDMA.Especially when the content of BR was 5 wt%,the properties of rABS/rHIPS/ZDMA/BR blends were the best.The notched impact strength was 125% of that of rABS/rHIPS/ZDMA blends without BRaddition,but the tensile strength decreased to a certain extent.The rheological test showed that the introduction of ionic crosslinking can enhance the storage modulus and loss modulus of the material,especially when the content of BR was 5 wt%,the rheological property of the blend was the best,and the toughness of the material was improved.DMA test results showed that the storage modulus and loss modulus of rABS/rHIPS/ZDMA/BR blends were significantly higher than those of rABS/rHIPS/ZDMA blends.FT-IR and crosslinking density test showed that ionic crosslinking occurred in rABS/rHIPS/ZDMA/BR blends.The fracture surface morphology showed that the polybutadiene(PB)with 5 wt% BR had good dispersion in rABS/rHIPS blend,and the between rABS and rHIPS was fuzzy,which indicated that the compatibility of rABS/rHIPS blend was improved.In this study,ionic crosslinking provided a new way for the recycling of waste plastics and a new method for the further study of multi-functional use of waste plastics.