Tayser Sumer Gaaz, Abdul Amir H Kadhum, Patina Kiah Anak Michael, Ahmed A Al-Amiery, Abu Bakar Sulong, Mohamed H Nassir, Ahed Hameed Jaaz
الملخص الانجليزي
A halloysite nanotubes–polyvinyl alcohol–polyvinylpyrrolidone (HNTs–PVA–PVP) composite has been investigated for a quite long time aiming at improving the physico–chemical characterization of HNTs. In this work, HNTs–PVA–PVP composite were prepared based on a unique procedure characterizedbycrosslinking twopolymerswith HNTs.Thecomposite oftwopolymers weremodifiedbytreatingHNTswithphosphoricacid(H3PO4)andbyusingmalonicacid(MA)asa crosslinker.Thecompositewasalsotreatedbyaddingthedispersionagentsodiumdodecylsulfate (SDS).TheHNTs–PVA–PVPcompositeshowsbettercharacteristicsregardingagglomerationwhen HNTsistreatedinadvancebyH3PO4.Fouriertransforminfraredspectroscopy(FTIR),X-raydiffraction (XRD),transmissionelectronmicroscopy(TEM),fieldemissionscanningelectronmicroscopy(FESEM), brunauer–emmett–teller (BET), size distribution, and atomic force microscopy (AFM) are used to characterizethephysio-chemicalpropertiesofthecomposite. FTIRshowsadditionalpeaksat2924.29, 1455.7,and682.4cm−1 comparedtotheneatHNTsduetoaddingMA.Despitethat,theXRDspectra donotshowasignificantdifference,thedecreaseinpeakintensitycouldbeattributedtotheaddition of semi-crystalline PVA and the amorphous PVP. The images taken by TEM and FESEM show the possible effects of MA on the morphology and internal feature of HNTs–PVA–PVP composite treated by MA by showing the deformation of the matrix. The BET surface area increased to 121.1 m2/g comparedtotheneatHNTsat59.1m2/g. Thisresult,thesecondhighestrecordedresult,isconsidered a breakthrough in enhancing the properties of HNTs–PVA–PVP composite, and treatment by MA crosslinking may attribute to the size and the number of the pores. The results from these techniques clearly showed that a significant change has occurred for treated HNTs–PVA–PVP composite where MA was added. The characterization of HNTs–PVA–PVP composite with and without treating HNTs and using crosslinker may lead to a better understanding of this new composites as a precursor to possible applications in the dentistry field.
تيسير سمير جعاز | Tayser Sumer Gaaz | 4299