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Fabrication and properties of multiwalled carbon nanotubes filled woven glass fibre reinforced epoxy laminated hybrid composites / Wan Dalina Wan Ahmad Dahalan

Withdrawn By: Mohamed YunusYusof
Reason: Duplicate
Date Withdrawn: 2019-11-19 00:00:00.0

Abstract Tiub nano karbon secara umumnya digunakan dalam fabrikasi komposit hibrid dengan tujuan menghasilkan komposit ringan. Dalam kajian ini, beberapa kaedah telah digunakan untuk mengisi tiub nano karbon berbilang dinding (MWCNT) di antara lapisan fabrik kaca dalam komposit lamina epoksi diperkuat gentian kaca. MWCNT diisi sama ada dengan menggunakan lapisan nipis tiub karbon, kertas bucky (lapisan MWCNT) ataupun dengan cara menyalutkan MWCNT di atas permukaan fabrik kaca melalui kaedah sebaran atau semburan. Kertas bucky yang mengandungi 150 mg hingga 300 mg MWCNT telah dihasilkan melalui kaedah penurasan hampagas pada tekanan 30 kPa dan 40 kPa. Berdasarkan pencirian kertas bucky tersebut, kertas bucky yang mengandungi 150 mg MWCNT yang dituras pada 30 kPa tekanan hampagas telah dipilih sebagai pengisi di dalam sistem komposit. Telah didapati bahawa komposit hibrid yang mengandungi kertas bucky terisi epoksi (CNTBPE) telah menunjukkan peningkatan kekuatan lenturan sebanyak 63 % dan 41 %, masing-masing lebih tinggi daripada komposit lamina GF/epoksi 3 lapis (3GF) dan GF/epoksi 4 lapis (4GF). Namun begitu, pengisian MWCNT dengan cara menggunakan kertas bucky tidak dapat meningkatkan suhu peralihan kaca (Tg) komposit hibrid tersebut. Dalam fabrikasi hibrid komposit MWCNT dengan bantuan dakwat hitam Cina, kajian yang telah dijalankan mendapati jumlah optimum dakwat hitam Cina yang diperlukan untuk penyebaran dan perlekatan MWCNT di atas permukaan fabrik kaca adalah sebanyak 5.6 % isipadu. Komposit hibrid dengan 1.4% isipadu MWCNT dan 5.6 % isipadu dakwat (CNT1.4/INK5.6) yang dihasilkan menunjukkan peningkatan kekuatan dan modulus lenturan masing-masing sebanyak 106 % dan 14 % berbanding 4GF. Walau bagaimanapun, didapati kaedah ini tidak menunjukkan peningkatan Tg yang ketara. Namun demikian, pengisian 0.6 % isipadu MWCNT melalui kaedah sebaran dengan bantuan 5.6 % isipadu dakwat hitam Cina (CNT0.6) telah didapati dapat meningkatkan kekuatan dan modulus lenturan. Berbanding 4GF, kekuatan dan modulus lenturan komposit hibrid CNT0.6 masingmasing didapati telah meningkat sebanyak 219 % dan 17 %. Sifat termomekanikal hibrid komposit CNT0.6 telah mencatatkan peningkatan. Peningkatan signifikan terhadap kekuatan impak serta kekuatan ricih antara lamina juga didapati berlaku terhadap komposit hibrid CNT0.6. Kaedah sebaran didapati merupakan kaedah yang terbaik berbanding kaedah-kaedah lain yang telah digunakan dalam kajian ini. Penambahbaikan sifat-sifat mekanikal dan termomekanikal menunjukkan bahawa komposit hibrid ringan yang mempunyai prestasi yang lebih baik telah berjaya dihasilkan. __________________________________________________________________________________ Carbon nanotubes are commonly utilized in fabrication of hybrid composite laminates in order to manufacture lightweight composites. In this research, the multiwalled carbon nanotubes (MWCNT) was incorporated in glass fibre reinforced epoxy laminated composites by different methods. The MWCNT incorporated was either in the form of buckypaper (CNT sheet) or attached onto the glass fabrics by spreading and spraying methods. Buckypapers with MWCNT loading varied from 150 mg to 300 mg were prepared by vacuum filtration method at 30 kPa and 40 kPa pressures. Based on the characterization of the buckypaper, buckypaper which contained 150 mg of MWCNT and vacuum filtered at 30 kPa pressure was selected to be incorporated into the composite system. It was found that hybrid composites incorporated with epoxy-filled buckypaper (CNTBPE) improved the flexural strength by 63 % and 41 % higher compared to 3-ply GF/epoxy (3GF) and 4-ply GF/epoxy (4GF) laminated composite, respectively. However, incorporation of MWCNT by using buckypaper was unable to increase the glass transition temperature (Tg) of the hybrid composites. In fabrication of ink-facilitated MWCNT hybrid composites, it was found that 5.6 vol % was the optimum loading of the Chinese black ink in order to improve the dispersion and attachment of MWCNT onto the glass fabrics. Flexural strength and modulus of the hybrid composite of 1.4 vol % CNT and 5.6 vol % ink loading (CNT1.4/INK5.6) was increased by 106 % and 14 % compared to 4GF, respectively. However, insignificant increment in Tg is observed using this method. On the other hand, incorporation of 0.6 vol % of MWCNT by spreading method in ink-facilitated hybrid composites (CNT0.6) has improved the flexural strength and modulus by 219 % and 17 % higher compared to 4GF, respectively. CNT0.6 exhibited the highest mechanical properties with improved thermomechanical properties. Significant improvement in impact strength and interlaminar shear strength was also observed in CNT0.6. The spreading method was found to be the best method among other methods utilized it throughout this research. Such improvement in mechanical and thermomechanical properties showed that fabrication lightweight hybrid composites with enhanced performance have been achieved.

Contributor(s): Wan Dalina Wan Ahmad Dahalan - Author Primary Item Type: Thesis Identifiers: Accession Number : 875008414 Language: English Subject Keywords: MWCNT; buckypaper; Significant Sponsor - Description: Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral - First presented to the public: 7/1/2017 Original Publication Date: 11/18/2019 Previously Published By: Universiti Sains Malaysia Place Of Publication: School of Materials & Mineral Resources Engineering Citation: Extents: Number of Pages - 213 License Grantor / Date Granted:   / ( View License ) Date Deposited 2019-11-18 12:11:36.78 Date Last Updated 2020-01-07 11:57:59.016 Submitter: Mohamed Yunus Yusof

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