Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, KİMYA MÜHENDİSLİĞİ ANA BİLİM DALI, Turkey
Approval Date: 2021
Thesis Language: Turkish
Student: Burcu GÜNER
Supervisor: Nursel Dilsiz
Abstract:
The aim of the thesis study is to recycle polyvinyl butyral (PVB) which is used as an intermediate
layer in waste car windshields, to prepare random and alligned nanofiber material by using the
electrospinning method with recycled PVB and to perform characterization studies. The
recycling process was carried out by soaking the waste car windshield in tetrahydrofuran (THF)
overnight, then adding n-Hexane to the solution containing the glass and polymer separated from
each other and precipitating the PVB. The precipitate was dried to obtain recycled waste
polyvinyl butyral (W-PVB). In the next step, solutions containing 20% by mass (w / v) recycled
PVB and commercial PVB film were prepared in the ratio of 70:30 (v / v) tetrahydrofuran (THF):
dimethylformamide (DMF) solvent mixture by volume. Nanofibers are produced with static and
rotating collectors to obtain random and oriented structures. Chemical, morphological and
thermal properties of nanofibers were determined by Fourier transform infrared microscope
(FTIR), nuclear magnetic resonance spectroscopy (NMR), X-ray diffraction (XRD), differential
scanning calorimetry (DSC), scanning electron microscopy (SEM), atamic force microscopy
(AFM) and surface contact angle analysis. FTIR showed that all recycled materials prepared
according to NMR spectra results were in the same chemical structure as the control group after
recycling and electrospinning processes, and that the XRD patterns preserved the amorphous
structure of the PVB. According to SEM and AFM results, all of the nanofibers were prepared
without beads, and uniform morphology. In addition, W-PVB and C-PVB nanofibers prepared
in the rotating collector produced in alligned morphology as expected. DSC thermograms
showed that when C-PVB and W-PVB nanofibers were compared, the glass transition
temperature (Tg) values of W-PVB nanofibers were 61-64 ºC and 57-59 ºC for C-PVB nanofibers
in parallel with their plasticizer content. W-PVB and C-PVB nanofibers showed high
hydrophobic properties with contact angle values above 130º. As a result, it has proved possible
to produce W-PVB electrospun nanofibers with successfully recycled by chemically from waste
car windshields and they are an extremely suitable candidate for use in a wide variety of
applications such as textiles, coating, filtration and adsorption.
Key Words : E lectrospinning, PVB, laminated glass, recycling, nanofiber