英语翻译
Thecriteriaforafailureofthistestingprotocolwasthepresenceofphaseseparationorprecipitationofsolidsintheinhibitorsolution.Theinitialscreeningperformedat150°Cfor48hourssawfailurebyDETP,MAandEPA.Afurther2chemistries(PPCAandPVS/EPAcopolymer)failedthe200oCtests.Oncoolingtheinhibitorsprecipitated
crystallinesolids,presumedtohaveformedfromthermallydecayedinhibitormoleculeparticulates.Nearlyallinhibitorsthatdidnotshowanyprecipitationorhazingdarkenedincolourbutthisiscommonplaceandwasnocauseforconcern.FTIRanalysiswasperformedonthethermallyagedinhibitorstocheckforanychangeinmolecularsymmetrythatwouldindicatethermaldegradation.Wherecrystallisationhadoccurred,therewereobviousdifferencesinspectrawithkeyactiveinhibitorcomponentpeaks.Thesepeakscouldeitherbedistortedorabsent,andinsomecaseswherephasechangeshadoccurrednewpeakswerepresentinagedsamples.Three
examplesofFTIRspectrahavebeendepictedinFigures3and4inhibitorsPPCAandSVSrespectively.ItcanbeseenthattheageingofInhibitorCat150°Chasnorealeffectontheformofthespectrumbutat200°Cthe1000-1500cm-1peaksradicallychangeformintermsofshape,intensityandpositionrepresentingacompletedegradationoftheactiveinhibitorproduct.SimilarlythespectrumofSVSchangesat200°Cwiththeabsenceapeakcenteredon2375cm-1representingabreakdownoftheinhibitorcompound.ThespectrumofInhibitorBhoweverhasnodiscernablechangesinformduringanythermalconditionsandthisisreflectedinvisual
observationsoftheinhibitor.Thesebreakdownscanalsobediscernedvisuallyintheformofhazingorrecrystallisation,buttheFTIRanalysisgivesadefinitiverepresentationofchangestotheformoftheinhibitormoleculescontainedwithinthevariouspackages.IndeedtheFTIRservestofurtherprovethevisualobservationsoftheinhibitorintolerancetohightemperatures.CompatibilityTestingAsuccessfulsqueezecandidateshouldbecompatiblewiththeformationwatersofsuchahighsalinitywell.Thecriteriaforasuccessfulpassatthisstageoftestingwouldbetheabsenceofprecipitatedspecieseitherpresentasparticulatesorashazingof