Fabrication and properties of multiwalled carbon nanotubes filled woven glass fibre reinforced epoxy laminated hybrid composites / Wan Dalina Wan Ahmad Dahalan
This publication is withdrawn.
Withdrawn By: Mohamed YunusYusof
Reason: Duplicate
Date Withdrawn: 2019-11-19 00:00:00.0
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.
Fabrication and properties of multiwalled carbon nanotubes filled woven glass fibre reinforced epoxy laminated hybrid composites / Wan Dalina Wan Ahmad Dahalan