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Morphology of Poly (lactic acid) Scaffolds Fabricat by a Modified Solvent Casting/Porogen Leaching Method  
Morphology of Poly (lactic acid) Scaffolds Fabricat by a Modified Solvent Casting/Porogen Leaching Method
資料類(lèi)型： PDF文件
關(guān)鍵詞： morphology  porous  scaffold  porogen  leaching  poly(lactic  acid)  
資料大小： 112K
所屬學(xué)科： 分子表征
來(lái)源： 第六屆亞歐研討會(huì)上處理和性能增強(qiáng)聚合物會(huì)議文集（2013.6.2-6 武漢）
簡(jiǎn)介：
Solventcasting/particulateleaching(SC/PL)ismostcommonlyusedforfabricatingmicro-porousandmacro-porouspolymerscaffolds.Theadvantageofthismethodisthattheprocessiseasytocarryoutandeasytocontroltheporesizeandporositybyselectingsuitableparticlesizeandamountoftheaddedsaltparticles.However,thescaffoldspreparedbythismethodusuallyhaveadensesurfacelayerandpoorinterconnectivitybetweenmacropores.Therefore,mostofthescaffoldspreparedbythismethodareeitherlimitedtotwo-dimensionalfilmsorconstructedbylaminationofseveralfilmsintodesiredshape.Inourpreviousstudy,amodifiedmethod,namelythesolventcasting/vacuumvolatilization/particulateleaching(SC/VV/PL)method,isproposedtofabricatethree-dimensionalpoly(lacticacid)(PLA)scaffoldscl]andgradedmacroporousPLAscaffoldc2]withadesiredrangeofcompressivemodulus,controlledporesizesandporosities.Inthisstudy,thePLAscaffoldswerefabricatedbytheSC/VV/PLmethodandtraditionalSC/PLmethodandwerecomparativelyresearched.Theeffectofthesizedistributionofporogenontheinterconnectivitybetweentheporeswasdiscussed,too.TheresultsshowedthattheSC/VV/PLmethodhassomeadvantageswhichcanovercomesomeshortcomingsofthetraditionalSC/PLmethod,suchasunsatisfactorysurfacestructure,longprocessingtimeandpoorinterconnectivitybetweenmacropores.Moreover,broadsizedistributionoftheporogenisbetterforforminggoodinterconnectivitybetweenmacropores.Whenthesmallsizeporogenwasblendedinthebigsizeporogen,thesmallNaCIparticlescanfilltheinterspaceamongthebigparticles.Thepackingvolumeoftheporogenwithbroadsizedistributionissmallerthanthesamequalityporogenwithnarrowsizedistribution.Thismeanstheporogenwithbroadsizedistributioncanbepackedmorecompactness.Thesmallparticlesbetweenbigparticlescancontributetowell-interconnectedporousstructure.
作者： X. H. Gong , L. Pan, X. Wang, J. Jiang, G. Zhang
上傳時(shí)間： 2013-06-28 17:30:30
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