磷酸酯PAM-200接枝改性水性环氧树脂的制备与性能研究.docx

磷酸酯PAM-200接枝改性水性环氧树脂的制备与性能研究
摘要：
本研究采用磷酸酯PAM-200对水性环氧树脂进行接枝改性，通过对改性前后水性环氧树脂的表面形貌、热性能、力学性能等进行测试，研究了PAM-200接枝改性对水性环氧树脂性能的影响。结果表明，PAM-200接枝改性可以显著增强水性环氧树脂的力学性能和耐热性能，同时同时改善了其表面形貌。因此，该研究为水性环氧树脂的应用开辟了一种新的改性途径，具有重要的理论和实际意义。
关键字：磷酸酯PAM-200；水性环氧树脂；接枝改性；性能。
Introduction:
Waterborneepoxyresinhasbeenwidelyusedinvariouscoatings,adhesivesandotherfieldsduetoitsexcellentadhesion,corrosionresistanceandenvironmentalprotection.However,itsmechanicalpropertiesandthermalstabilityarestillnotsatisfactory,whichlimitsitsfurtherapplications.Graftmodificationisoneoftheeffectivewaystoimprovetheperformanceofwaterborneepoxyresin.Amongthem,phosphorylationmodificationhasreceivedincreasingattentionduetothegoodcompatibilitybetweenphosphorylatedpolymersandepoxyresins.
Experimentalpart:
1.Materialsandequipment:
Waterborneepoxyresin(WR-20),PAM-200,γ-glycidoxypropyltrimethoxysilane(KH560),ethanol,cyclohexane,sodiumhydroxide,hydrochloricacid,etc.,wereallanalyticalgradereagents.Theinfraredspectrometer(FTIR)isNicolet6700,scanningelectronmicroscope(SEM)isHitachiS-3400,thermalanalysismeter(DSC)isMettlerToledoDSC1STAReSystemanduniversaltestingmachine(UTM)isHounsfieldH10KS.
2.Graftmodification:
(1)PreparationofPAM-200solution:1.0gPAM-200wasdissolvedin50mLethanoltoobtaina2%(massfraction)PAM-200solution.
(2)ModificationofWR-20:50gWR-20wasmixedwith0.5gKH560and20mLcyclohexane,stirredat80°Cfor30min,thencooledtoroomtemperature.Then,1.0mLPAM-200solutionwasaddedandstirredat40°Cfor4h.Afterthat,themixturewasdilutedwithwaterandfilteredtoobtainthemodifiedwaterborneepoxyresin.
3.Characterization:
(1)Surfacemorphology:TheSEMimagesofthecrosssectionofthemodifiedandunmodifiedWR-20coatingswereobtained.
(2)Thermalproperties:TheDSCcurvesofthemodifiedandunmodifiedWR-20wererecorded.
(3)Mechanicalproperties:Thetensilestrength,elongationatbreakandtheYoung'smodulusofthemodifiedandunmodifiedWR-20wereobtainedbyUTMtesting.
Resultsanddiscussion:
1.Surfacemorphology:
AsshownintheSEMimages(Fig.1),themodifiedWR-20coatinghasasmootherandmoreunif