LLDPE2f壳聚糖共混驻极包装薄膜的制备与性能分析

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1、万方数据ABSTRACTChitinsexistwideiyinshellsofcreaturesandthecellwallsoffUngi．ChltosanlsN—deacetylationproductwhichcomesf吣mchitin．Inrecentyears，manyapplicationsofchitosanhavea仕ractedw．deattention，includingbiodegradability，bioco瑚【pat．bility，antibacterialactiVitya11dp

2、reservatiVec叩acity．Becauseofthegoodmechanicalpropen．esof1inearlowdensitypolyemyleneandtheeasypolarizationandwideantimicrobialpropertiesofchitosan，LLDPE／chitosanblendpackagingfilmswereprepared．Themaincontentsareasfbllows：(1)ChitosanwasdissolVedinaceticacidaqueo

3、ussolution，makingchitosanprecipitatedwithsodiumsulfate．LLDPE—g—AAwastreatedascompatibilizer．Thentensileproperties，crystallizationsandrheologicalpropertiesofLLDPE／LLDPE-g—AA／chitosanblendswerestudiedrespectiVely．Asthechitosancontentincreased，thetensilepropertie

4、softheblendsdeteriorate．AIthoughchitosanhaslittleinnuenceonthemeltingtempemtureandcr)，stallizationtemperatureoftheblends，crystallinit)rwasreduced．Rheologicaltestsshowthattheblendsaccordwith”shearminnin∥lawofthenonjNewtoniannuid．(2)Chitosanwascross一1inkedbyglut

5、araIdehyde(asacmss—linkingreagent)．AndchitoSanwasmodinedwithfivekindsofmonomers(octaIlal，nonanal，decanal，cinnaInicaldehydeandp—dimethylaminobenzaldehyde)tofonnShjffbase．1、hechemicalstructuresofchitosanderivativeswerechamcterizedbyFTIR卸d1H-NMR．LLDPE／chitosander

6、iVatiVeblendswereprepared．(3)ThewaterVaporpemeabil．tiesofLLDPE／LLDPE—g—AA／chitosanblendsandLLDPE／chitosander．VatiVeswereinVestigated．Duetohydmphilicityofchitosan，thepenneabilitycoe币cientsofblendsfilmswerehigherthanLLDPEfilm．WhenthecontentofchitosananditsderiVa

7、tiVesis15％，thewaterv印orpe册eabilityishighest．(4)Thee毹ctsofdifferent伊oupsofchitosanderiVatiVesondieIectricpropertiesandthesurfacepotentialV旧reinVestigated．WiththeincreasingofchitosananditsderiVatiVes，thedielectricconstantsand10sstangentsoftheblendsincreaSe．Butch

8、jtosanderiVatiVecontentreachedat20％，thedielec订icconstantdecreasedslightly．Thesurfacepotentialwasmeasured．Thecha唱econtentonthesurfIaceofblendfilmsdecayedra牟dlyinashorttime，andthenst