高溫熱處理前后竹材主要化學成分及物理力學性能研究.pdf

1、南京林業(yè)大學碩士學位論文高溫熱處理前后竹材主要化學成分及物理力學性能研究姓名：包永潔申請學位級別：碩士專業(yè)：木材科學與技術(shù)指導教師：蔣身學20090601ResearchontheMainChemicalComponents，PhysicalandMechanicalPropertiesofBambooafterThermalTreatmentAbstractThispaperistostudyonthechangesofbambooc

2、omponets，phr7sicalandmechnicalproertiesbeforeandafterheat—treatmentAnexperimentwascarriedout晰t11twomainindexes，ieheattreatmenttemperatureandtreatmenttimeThosechangesappearedunderdifferentsconditionswereinvestigatedinthis

3、thesisThebestheattreatmentprocesseswhichCanmeetdifferentdemandswereobtainedafteranalyzingTheresultsshowthat：Byheattreatment，complexchemicalchangesinbambooweretakenplaceWiththeraiseofheattreatmenttemperatureandheattreatme

4、nttime，celluloseandholocellulosecontentsdescend，butlignincontentascendsItisveryobviousthatthemainchemicalcomponentswereaffectedbyheattreatmenttemperaturecomparedwithuntreatedbambooForexample，thecellulosecontentreduced150

5、2％，holocellulosecontentreduced2908％，butlignincontentincreased2426％Afterheattreatmentthedensityshrinkageandswellingofbamboodescend、析ththeraiseofheattreatmenttemperatureandheattreatmenttimeTheaffectionofheattreatmenttemper

6、atureissignificantandheattreatmenttimeinsignificantThetrendofthefivemainmechanicalpropertiesshowsdownforwardastheheattreatmentarisesHeattreatmenttemperatureforthemechanicalpropertiesissignificant，butheattreatmenttimefors

7、hearingstrengthparalleltograinissignificantForbamboodensityandmechanicalproperties，theoptimalheattreatmentprocessisasfollows：temperature150“C，heat—treatmenttime2hForbambooshrinkageandswelling，theoptimalheattreatmentproce