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简介:Theroleofnano-SiO2andultra-fineboroncarbideonthepropertiesofalumina-graphitematerialswasinvestigated.Thestudyshowedthattheultra-fineboroncarbideaddedmodifiedthemicrostructureofresidualcarbonandpromotedthechemicalbondbetweenresidualcarbonfromphenolicresinandflakegraphite.Thecarbonwhitecouldstrengthentheresidualcarbonfromphenolicresin.ThesetwoadditivesimprovedthemechanicalpropertiesofAGrefractoriesatbothroomtemperatureandhightemperature,andthermalshockresistancewasimprovednoticeably.Whenthetwoadditivesweredopedtogether,carbonwhitecouldretardtheevaporationofB2O3.Thermalshockresistancewasguaranteedwithasmalleramountofultrafineboroncarbide.
简介:研究了乙烯/丙烯酸正丁酯/甲基丙烯酸缩水甘油酯(EBA—GMA)和锌离聚物增韧聚乳酸(PLA)。通过ZnO中和乙烯/甲基丙烯酸共聚物(EM从)制备锌离聚物。详细研究了混炼时PLA和EBA—GMA的反应界面相容性和EBA—GMA的交联性。断口和FT—IR分析表明,离聚物的中和度(DN)和离聚物前驱体中甲基丙烯酸(MAA)的含量对界面相容性有显著影响。动态力学分析也表明,EBA—GMA的交联程度随这两个因素变化。TEM照片图像分析三元共混物分散相的粒径和多分散性与共混物的冲击强度和离聚物的特性的相关性。前驱体中MAA含量高或离聚体中和度高都赋予PLA共混物更高的冲击强度。