玻璃转变温度检测

检测项目

ThermalPropertiesDetection:

• GlassTransitionTemperature:Tgvalue(°C),transitionwidth(°C)(RefertoASTMD3418)
• MeltingTemperature:Tmvalue(°C),crystallinity(%)
• HeatCapacityChange:ΔCp(J/g·K)

DynamicMechanicalPropertiesDetection:

• StorageModulusTransition:E'droppoint(°C),temperaturerange(°C)
• LossFactorPeak:tanδmaxvalue,peakwidth(°C)
• GlassTransitionRegion:moduluscrossovertemperature(°C)

ThermalStabilityDetection:

• DecompositionOnsetTemperature:Td(°C)(RefertoISO11358)
• OxidativeInductionTime:OIT(min),temperaturestability(°C)
• WeightLossRate:%/minatspecifictemperature(°C)

CuringBehaviorDetection:

• CureReactionKinetics:activationenergy(kJ/mol),reactionrateconstant
• GelPointTemperature:Tgonset(°C),timetogel(min)
• Post-CureTgShift:ΔTg(°C)afteraging

MolecularWeightEffectsDetection:

• GlassTransitionvsMolecularWeight:Tg=f(Mw)correlation
• ChainMobilityAnalysis:freevolumefraction(%),relaxationtime(s)
• BranchingImpact:branchingindex,Tgreduction(°C)

PhaseSeparationDetection:

• MultipleTgPeaks:peakseparation(°C),domainsize(nm)
• CompositionEffect:Tgblendruledeviation(°C),phasediagramanalysis
• InterfaceInteraction:Tgshiftatinterface(°C)

PlasticizerEffectsDetection:

• PlasticizerConcentration:Tgreductionperwt%(°C/wt%)
• CompatibilityTest:phaseseparationtemperature(°C),solubilityparameter
• MigrationImpact:Tgchangeaftermigration(°C)

AgingandDegradationDetection:

• ThermalAgingImpact:Tgshiftafteraging(°C),timedependency
• HydrolyticDegradation:Tgchangeinhumidity(%)
• UVExposureEffect:Tgreductionafterirradiation(kJ/m²)

FilmandCoatingApplicationsDetection:

• FilmTgMeasurement:thicknesseffect(°C/μm),adhesionstrength(MPa)
• CuringDegree:residualenthalpy(J/g),crosslinkdensity
• BarrierProperties:Tgcorrelationwithpermeability(cm³/m²·day·Pa)

CompositeMaterialsDetection:

• ReinforcementEffect:Tgshiftwithfillerloading(°C/wt%)
• InterphaseCharacterization:Tggradient(°C),interfacialadhesionindex
• ThermalExpansionMismatch:CTEdifference(ppm/K)vsTg

检测范围

1.ThermoplasticPolymers:Includingpolyethylene,polypropylene,andpolystyrene,withfocusonTgimpactonimpactstrengthandservicetemperaturelimits.

2.ThermosettingResins:Coveringepoxy,phenolic,andpolyurethaneresins,emphasizingTgvariationduringcuringcyclesandpost-curestability.

3.ElastomersandRubbers:Encompassingnaturalrubber,siliconerubber,andbutylrubber,prioritizingTgdeterminationforflexibilityretentionandlow-temperatureperformance.

4.EngineeringPlastics:Suchaspolycarbonate,polyamide(nylon),andPEEK,highlightingTginfluenceonmechanicalpropertiesanddimensionalstability.

5.BiomedicalPolymers:Includingpolylacticacid(PLA),polyethyleneglycol(PEG),andhydrogels,withemphasisonTgforbiocompatibilityanddegradationratecontrol.

6.AdhesivesandSealants:Coveringepoxyadhesives,siliconesealants,andpressure-sensitiveadhesives,focusingonTgforbondstrengthandcuremonitoring.

7.PackagingMaterials:SuchasPET,PVC,andbiodegradablefilms,prioritizingTgforbarrierpropertiesandthermalresistanceinstorage.

8.CompositesandLaminates:Encompassingcarbonfiberreinforcedpolymers,glassfibercomposites,andlaminates,withemphasisonTgforinterfacialbondingandthermalcyclingresistance.

9.CoatingsandPaints:Includingautomotivecoatings,powdercoatings,andUV-curablecoatings,focusingonTgforfilmformationhardnessandscratchresistance.

10.FoamsandInsulationMaterials:Suchaspolyurethanefoam,polystyrenefoam,andaerogels,highlightingTgforthermalinsulationefficiencyandcompressivestrength.

检测方法

国际标准：

• ASTMD3418-21JianCeTestMethodforTransitionTemperaturesandEnthalpiesofFusionandCrystallizationofPolymersbyDifferentialScanningCalorimetry
• ISO11357-2:2020Plastics-Differentialscanningcalorimetry(DSC)-Part2:Determinationofglasstransitiontemperature
• ASTMD4065-20JianCePracticeforPlastics:DynamicMechanicalProperties:DeterminationandReportofProcedures
• ISO6721-1:2019Plastics-Determinationofdynamicmechanicalproperties-Part1:Generalprinciples

国家标准：

• GB/T19466.2-2021塑料差示扫描量热法（DSC）第2部分：玻璃化转变温度的测定
• GB/T36800.1-2021塑料动态力学性能的测定第1部分：通则
• GB/T2918-2018塑料状态调节和试验的标准环境
• GB/T36800.2-2021塑料动态力学性能的测定第2部分：扭摆法

（方法差异说明：ASTMD3418specifiesheatingratesof10-20°C/min,whileGB/T19466.2allows5-20°C/minwithemphasisonsamplemasscontrol;ISO11357-2requiresnitrogenpurgeforbaselinestability,differingfromASTM'soptionalinertgas;GB/T36800.1definesfrequencysweeprangesdivergingfromISO6721-1indampingfactorcalculation.)

检测设备

北检(北京)检测技术研究院【简称：北检院】

报告：可出具第三方检测报告(电子版/纸质版)。

检测周期：7~15工作日，可加急。

资质：旗下实验室可出具CMA/CNAS资质报告。

标准测试：严格按国标/行标/企标/国际标准检测。

非标测试：支持定制化试验方案。

售后：报告终身可查，工程师1v1服务。

以上是与"玻璃转变温度检测"相关的简单介绍，具体试验/检测周期、检测方法和仪器选择会根据具体的检测要求和标准而有所不同。北检研究院将根据客户需求合理的制定试验方案。