Please use this identifier to cite or link to this item:
https://ptsldigital.ukm.my/jspui/handle/123456789/499643Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | Rusli Daik, Prof. Dr. | - |
| dc.contributor.author | Sarifah Fauziah Syed Draman (P55925) | - |
| dc.date.accessioned | 2023-10-13T09:33:24Z | - |
| dc.date.available | 2023-10-13T09:33:24Z | - |
| dc.date.issued | 2014-01-10 | - |
| dc.identifier.other | ukmvital:80638 | - |
| dc.identifier.uri | https://ptsldigital.ukm.my/jspui/handle/123456789/499643 | - |
| dc.description | Development of small electronic devices inspired the invention of thermally conductive material that can dissipate heat quickly from the device. This study is concerned to conceive a light material with good adhesion property that can dissipate heat efficiently. Nanocomposite of thermally conductive coating was prepared from cellulose-based adhesive, toulene sulfonic acid-doped polypyrrole (TSA-doped PPy) with and without ceramic filler via collodial dispersion method. Ceramic filler was added to enhance thermal conductivity of theprepared nanocomposite. Cellulose was extracted from kapok (Ceiba Pentandra (L.)) by using three different methods, namely conventional, dissolution in deep eutectic solvent (DES) and organosolv treatment. Cellulose was then modified with epoxy group to incorporate adhesion property. Two reagents used were epichlorohydrin and allyl glycidyl ether (AGE). PPy nanoparticles were synthesized via chemical oxidative polymerization using pyrrole, toulene sulfonic acid and ammonium persulfate (APS) as monomer, doping agent and oxidant, respectively. A three-level Box-Behken design (BBD) was employed in doping optimization of TSA-doped PPy. Surface morphology of the untreated and treated fibers was investigated using field emission scanning electron microscopy (FESEM). Samples of extracted and modified cellulose were characterized by using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and nuclear magnetic resonance spectroscopy (NMR). Degree of substitution (DS) for modified cellulose was determined by using titration method and 1H NMR spectroscopy. TSA-doped PPy and nanocomposite were characterized by using FTIR, FESEM, TGA, DSC, electrical and thermal conductivity. Doping level of synthesized polymers were calculated from elemental analysis (EA) and TGA results. BBD was applied to the experimental data using statistical software, Design-expert (6.0.5). Results show that the cellulose was successfully obtained via all the methods of extraction used. The organoslov treatment method gave the highest yield of cellulose extraction (68.50 wt%) as compared to dissolution in DES method (47.97 wt%) and conventional method (54.79 wt%). DS of allylated cellulose and epoxy-cellulose are 1.85 and 0.43, respectively. SEM micrographs show that the synthesized TSA-doped PPy particles are spherical in shape. The range of nanoparticle diameters is around 80-100 nm. The statistical analysis based on BBD shows that 1:1 mole ratio of TSA to pyrrole and 0.50 M APS were the optimum conditions to achieve a sufficient doping level. SEM micrographs show ceramic filler (5 wt%) and TSA-doped PPy were well dispersed in the matrix. Results also show the prepared nanocomposites were stable at high temperature. The electrical conductivity found for the nanocomposite was in the range of semi conductive region,which is 10-5to 10-3 Scm-1. Meanwhile, the thermal conductivity reading was higher than the conventional polymer. The nanocomposite with silicon carbide (SiC):silicon nitride (Si3N4) (80:20) gave the highest thermal conductivity with 0.636 W/mK, compared to those with SiC: Si3N4 (20:80), 0.572 W/mK and SiC, 0.528 W/mK.,Pembangunan peranti elektronik dengan saiz yang kecil telah mengilhamkan ciptaan bahan berpengalir haba yang boleh mengalir haba dengan cepat. Kajian ini menekankan ke arah penghasilan bahan yang ringan yang mempunyai sifat lekatan yang baik dan boleh mengalirkan haba dengan cekap. Nanokomposit penyalut berpengalir haba disediakan daripada pelekat berasaskan selulosa, polipirola berdop asid sulfonik toluena (PPy-berdop TSA) dengan dan tanpa pengisi seramik melalui kaedah penyebaran koloid. Pengisi seramik ditambah untuk meningkatkan kekonduksian haba bagi nanokomposit tersebut. Selulosa diekstrakkan daripada kekabu (Ceiba Pentandra (L.)) menggunakan tiga kaedah berbeza, iaitu konvensional, pelarutan dalam 'deep eutectic solvent' (DES) dan rawatan 'organosolv'. Selulosa kemudiannya dimodifikasikan dengan kumpulan epoksi untuk memperolehi sifat lekatan. Dua reagen yang digunakan adalah epiklorohidrin dan alil glisidil eter (AGE). Nanopartikel PPy disintesis melalui pempolimeran pengoksidaan kimia menggunakan pirola, asid sulfonik toluena dan ammonia persulfat (APS), masing-masing sebagai monomer, agen pendopan dan agen pengoksidaan. Rekabentuk Box-Behken (BBD) peringkat-tiga digunakan untuk pengoptimuman pendopan PPy-berdop TSA. Morfologi permukaan gentian yang dirawat dan belum dirawat dikaji menggunakan mikroskopi elektron imbasan pancaran medan (FESEM). Sampel selulosa yang diekstrak dan yang dimodifikasi dicirikan menggunakan spektroskopi infra-merah Fourier transform (FTIR), penganalisis gravimetri terma (TGA), kalorimeter imbasan pembeza (DSC), penyerakan sinar-X (XRD) and spektroskopi resonans magnetik nuklear (NMR). Darjah penukargantian (DS) untuk selulosa termodifikasi ditentukan melalui kaedah titratan and spektroskopi 1H NMR. PPy-berdop TSA dan nanokomposit pula dicirikan melalui FTIR, FESEM, TGA, DSC, kekonduksian elektrik dan haba. Tahap pendopan dikira daripada keputusan analisis unsur (EA) dan TGA. BBD diaplikasikan kepada data ekperimen menggunakan perisian statistik, 'Design-expert' (6.0.5). Keputusan menunjukkan bahawa selulosa berjaya diperolehi daripada ketiga-tiga kaedah pengekstrakan yang digunakan. Kaedah rawatan 'organoslov' memberikan hasil yang tertinggi untuk pengekstrakan selulosa (68.50 wt%) berbanding kaedah pelarutan dalam DES (47.97 wt%) dan keadah konvensional (54.79 wt%). DS bagi selulosa alil dan epoksi-selulosa adalah masing-masing 1.85 dan 0.43. Mikrograf SEM menunjukkan partikel PPy-berdop TSA berbentuk sfera. Julat diameter bagi nanopartikel tersebut adalah sekitar 80-100 nm. Analisis statistik berasaskan BBD menunjukkan bahawa nisbah mol 1:1 TSA kepada pirola dan 0.50 M APS merupakan keadaan optimum untuk mencapai tahap pendopan yang sesuai. Mikrograf SEM juga menunjukkan pengisi seramik (5 wt%), PPy-berdop TSA disebarkan secara sekata di dalam matrik. Keputusan juga menunjukkan nanokomposit yang disediakan adalah stabil pada suhu tinggi. Kekonduksian elektrik untuk nanokomposit adalah di dalam julat separa konduktif iaitu antara 10-5to 10-3 Scm-1. Sementara, kekonduksian haba adalah lebih tinggi dari polimer konvensional. Nanokomposit dengan silikon karbida (SiC):silikon nitrida (Si3N4) (80:20) memberikan kekonduksian haba tertinggi iaitu 0.636 W/mK, berbanding dengan SiC:Si3N4 (20:80), 0.572 W/mK dan SiC, 0.528 W/mK.,Ph.D. | - |
| dc.language.iso | eng | - |
| dc.publisher | UKM, Bangi | - |
| dc.relation | Faculty of Science and Technology / Fakulti Sains dan Teknologi | - |
| dc.rights | UKM | - |
| dc.subject | Polypyrrole | - |
| dc.subject | Ceramic fillers | - |
| dc.subject | Nanocomposites (Materials) | - |
| dc.subject | Dissertations, Academic -- Malaysia | - |
| dc.subject | Universiti Kebangsaan Malaysia -- Dissertations | - |
| dc.title | Nanocomposite of chemically modified cellulose, doped polypyrrole and ceramic fillers as thermally conductive coating material | - |
| dc.type | Theses | - |
| dc.format.pages | 178 | - |
| dc.identifier.callno | TA418.9.N35S246 2014 tesis | - |
| dc.identifier.barcode | 001346 | - |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_80638+SOURCE1+SOURCE1.0.PDF Restricted Access | 3.91 MB | Adobe PDF |  View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.