不同结构磷酸酯对PMMA性能的影响

Effect of Phosphate Esters with Different Structures on Properties of PMMA

在磷酸酯分子结构中,酯基的结构、数量和取代基类型对聚甲基丙烯酸甲酯(PMMA)性能影响不同,本研究以磷酸三乙酯(TEP)、磷酸二苯酯(RDP)和卤代磷酸酯(TCEP)为原料,通过本体聚合法制备了不同结构磷酸酯/PMMA透明复合材料。详细研究了不同结构磷酸酯对PMMA可见光透过性能、热学性能、阻燃性能和吸水性能影响。研究发现,磷酸酯/PMMA复合材料可见光(380~780 nm)透光率都在85%以上;TEP或TCEP质量分数达到20%时,PMMA达到UL94 V-0级阻燃性能,而RDP质量分数达到25%,并未通过V-0级阻燃评判;TCEP/PMMA复合材料的热稳定性最优,RDP可以显著降低PMMA的吸水性,RDP/PMMA和TCEP/PMMA复合材料的耐热性较TEP/PMMA复合材料优异。

In the molecular structure of phosphate ester,the structure,quantity and type of substituents of ester groups had different effects on the properties of polymethyl methacrylate(PMMA).Transparent phosphate/PMMA composites with different structures were prepared by bulk polymerization using triethyl phosphate(TEP),diphenyl phosphate(RDP)and Halogenated Phosphate(TCEP)as raw materials.The effects of phosphate esters with different structures on the visible light transmittance,thermal properties,flame retardancy and water absorption of PMMA were studied.It is found that the visible light(380~780 nm)transmittance of phosphate/PMMA composites is more than 85%.When the dosage of TEP or TCEP could reach 20%,the flame retardancy of PMMA could achieve UL94 V-0 level.While the content of RDP reaches 25%,it could not achieve V-0 level.TCEP/PMMA composites have the best thermal stability,RDP could decrease the water absorption of PMMA,and RDP/PMMA and TCEP/PMMA composites have better heat resistance than TEP/PMMA composites.