%0 Journal Article
%T CharacterizationoftheMechanicalPropertiesofUrea-FormaldehydeMicrocapsules
%A 刘天中
%J 过程工程学报
%D 2005
%X Themechanicalpropertiesofurea-formaldehyde(U-F)microcapsulesweredeterminedusingamicromanipulationtechniqueandatheoreticalmodel.Loading-unloading,compressingandholding,andcompressingtoburstingtestsatdifferentspeedsbetweentwoparallelplatesforsinglemicrocapsuleswerecarriedout.ItwasfoundthattheU-Fmicrocapsuleswerevisco-elastic(mainlyelastic)atsmallcompressivedeformation,andplasticunderlargedeformation.Thetransitionpointfromelastictoplasticoccurredatabout(14±0.2)%compressivedeformation.Allthemicrocapsuleswoulddisruptwhencompressedtoabout(17±0.2)%deformation,andtheburstforceincreasedlinearlywiththeirdiameter.Compressingspeedhadnoremarkableeffectonbothburstforceandburstdeformation.Liquidfillednon-permeableandlinearelasticsphericalmembranemodelwasusedtosimulatetheuniaxialcompressionofsinglemicrocapsule,anditsmembranemodulusEhwasdeterminedbyfittingmodelpredictiontoexperimentaldata.TheaveragevalueofEhwasestimatedtobe(478±8)N/m.
%K urea-formaldehydemicrocapsule
%K micromanipulationtechnique
%K mechanicalproperties
%K linearelasticity
%K Young￠smodulus
%U http://www.jproeng.com/qikan/Cpaper/zhaiyao.asp?bsid=353