| Selecteing five kinds of composite halogen-free flame retardant, including ammoniumpolyphosphate(APP)/pentaerythritol(PER)/microencapsulized red phosphorus(RP),APP/PER/melamine(MEL), magnesium hydroxide(MH)/RP, APP/melaminecycmurate(MCA), MH/MCA, as subject investigated forcomparison of effect on properties ofpolystyrene (PS) in this paper. Using PS as the carrier, maleic anhydride (MAH) as a graftingmonomer and dicumyl peroxide(DCP)as an initiator, the compatibilizer PgM was prepared byadopting the method of melt grafting. When the reaction temperature was180℃, the screwrotating velocity was40r/min, the reaction time was7min and the ratio of PS, MAH and DCPwas100︰5︰0.2, the PgM was prepared, which graft degree was3.7%. The mechanicalpropertie of PS/APR was improved through mixing PS with HDPE, using PgM and thecomposite elastomers of SBS/SEBS(SS), repsectively. The results showed that taking75phrPS and25phr HDPE as resin matrix,40phr APR as flame retardant, the mechanical propertieand flame retardance of PS/APRcomposites improved more, when the dosage of SEBS, SBSand PgM was5phr,9phr and12phr, repsectively, the impact strength of PSPE/APR/SS/PgMcomposites was4.89kJ/m2, the tensile strength was21.3MPa, LOI was27.4%, the verticalcombustion grade reached FV-0, the melt index was4.62g/10min and the thermal stabilitywas improved. The PS/DK1and PS/DK4nano-composites was prepared by the method ofmelting intercalation, the mechanical property, the thermal stability and the flame retardanceof PS/DK1composite was better than those of PS/DK4composites. The property ofPSPE/APR/SS/PgM composites improved dramatically, when the dosage of DK1was5phr,the tensile strength increased2.1MPa, the impact strength increased9.8%, the LOI reached28.7%and the thermal stability improved noticeably. The LOI of PSPE/SS/PgM compositeflame retardanted by MRF was28.1%, MRF was composed of MH, RP and thermoplasticphenol-formaldehyde resin(PFR), the optimal ratio was50︰12︰9. The comprehensiveproperty of PSPE/SS/PgM/MRF composite was optimum, when the dosage of DK1was3phr,the tensile strength raised to29.3MPa, the impact strength was3.01kJ/m2, the thermal deformation temperature and vicat softening temperature increased2.8℃and5.5℃,repsectively, the thermal stability was enhanced. Using SBS enclosed MH led to form theelastomer encapsulation layer and core-shell stucture in the PSPE/SEBS/PgM/MRF, whichcould buffer the external force produced an clear improvement on the impact strength and ansmall decrease on the tensile strength, the optimal ratio of SBS and MH was3︰1. Throughcooperating SBS with PgM and enclosing MH, prepared PSPE/SEBS/MRF composite withcore-shell structure. When the ratio of SBS and PgM was3︰2, the tensile strength ofPSPE/SEBS/MRF composite increased to29.3MPa, the impact strength reached to6.07kJ/m2.Cooperating SBS and PgM not only improved the compatibility of SBS and PgM, but asloimproved the compatibility of core-shell partical and matrix. |
