Rigid polyurethane foam reinforced with cellulose whiskers: Synthesis and characterization

Nano-Micro Letters

Yang Li¹  Hongfeng Ren¹  Arthur J. Ragauskas¹ 

关键词: Nanocomposites;    Cellulose whiskers;    Tensile;    Compressive;    Thermal;   

DOI  :  10.5101/nml.v2i2.p89-94

来源: Open Access House of Science and Technology

【 摘 要 】

Anovelnanocompositeofrigidpolyurethanefoamwaspreparedbythepolymerizationofasucrose-basedpolyol,aglycerol-basedpolyolandpolymericmethylenediphenyldiisocyanateinthepresenceofcellulosewhiskers.Thecellmorphologyoftheresultingfoamswasexaminedbyscanningelectronmicroscopywhichshowedboththepurefoamandthenanocompositefoamhadhomogeneouscelldispersionanduniformcellsizeofapproximately200μm.AnalysisofthefoamsbyFouriertransforminfrared(FT-IR)spectroscopyindicatedthatbothsamplesexhibitedsignalsattributedtothepolyurethaneincludingtheNHstretchingandbendingvibrationsat3320cm-1and1530cm-1,theOC=Ovibrationat1730cm-1andtheCO-NHvibrationat1600cm-1.FT-IRanalysisofthenanocompositeindicatedthatcellulosewhiskerswerecrosslinkedwiththepolyurethanematrixasthesignalintensityoftheOHstretchat3500cm-1wassignificantlyreducedincomparisontothespectraldataacquiredforacontrolsamplepreparedfromthepurepolyurethanefoammixedwithcellulosewhiskers.AccordingtoASTMstandardtestingprocedures,thetensilemodulus,tensilestrengthandyieldstrengthofthenanocompositefoamwerefoundtobeimprovedby36.8%,13.8%and15.2%,andthecompressivemodulusandstrengthwereenhancedby179.9%and143.4%,respectively.Dynamicmechanicalanalysisresultstestifiedtheimprovementsofmechanicalpropertiesandshowedabetterthermalstabilityofthenanocompositefoam.

【 授权许可】

Unknown