The Application Of P-(di/triphenylethyl)styrene In Polymer Synthesis And Modification

In this paper,two compounds containing polyphenylene structure were used for the synthesis of p-(2,2,2,-triphenyl)styrene and p-(2,2-diphenyl)styrene.Application of SEBS modification:1.P-(2,2,2,-triphenyl)styrene is a near-nano-sized polyaryl rigid compound which can be used to modify elastomeric SEBS containing a rigid structure of styrene.Therefore,in this paper,several small molecules with similar structure and small particle size,such as p-(2,2,2,-triphenyl)styrene,were prepared by solution blending-flocculation method and solution blending-volatilization method.(Tetrastyrene,pyrene,p-terphenyl,POSS)and its polymer(PTPES)on the modification of SEBS,aiming to improve its melt viscosity without reducing its mechanical properties.Among them,the solution blending-flocculation method has poor compatibility of the blending system due to the excessive volatilization rate of the solution,so that the change of the melting index and mechanical properties of the modified SEBS is not obvious.In solution blending-volatile method,p-(2,2,2-triphenyl)styrene increased the melting index of SEBS from 0.17 to 0.23,and the tensile strength decreased from 37.3MPa to 29.8MPa.Blend compatibility Good;the modification effect of the embedded naphthalene is better.The addition of the embedded naphthalene increases the melting index of SEBS from 0.17 to 0.38,the mechanical properties are slightly decreased,and the compatibility of the blend is good.The modification effect of several other particles is not satisfactory.2.The branched polystyrene is synthesized by a one-step self-condensation vinyl polymerization of inimer monomer-(2,2,2-triphenyl)styrene containing a carbon-carbon weak bond.The results showed that the molecular weight decreased from 91,000 to 29,000 with temperature;from 24,000 to 41,000 with the increase of reaction concentration.The degree of branching increased from 6.5 to 10.8 with increasing temperature and from 7.1 to 15.5 with increasing monomer concentration.The toluene system ean prepare a high molecular weight branched polymer having a molecular weight of 453,000.The bulk polymerization can prepare an ultrahigh molecular weight branched polymer having a molecular weight of 701,000.The method can also prepare a branched styrene-maleic anhydride resin,and the introduction of maleic anhydride can make the reaction occur at 70 0 C.The molecular weight of the copolymer decreased from 50,000 to 16,000 with increasing temperature,and the degree of branching was as high as 25.9.3.By anionic polymerization,a 1,4-structured cyclohexadiene-styrene copolymer and a linear poly(p-(2,2-diphenyl)styrene are prepared,and a triphenylstyrene-containing fluorescent polymer can be obtained after dehydrogenation.The fluorescent property of the copolymer dehydrogenation product is aggregation quenching,and the fluorescent property of the linear poly(p-(2,2-diphenyl)styrene dehydrogenation product is aggregation-induced luminescence.