Sains Malaysiana 52(5)(2023):
1567-1579
http://doi.org/10.17576/jsm-2023-5205-18
Fabrication of
Aromatic Polyimide Films Derived from Diisocyanate with Fluorinated Dianhydride
(Pembuatan Filem Polimida Aromatik Terhasil daripada Diisosianat dengan
Dianhidrida Berfluorinat)
NAJAA MUSTAFFA1, TATSUO KANEKO2,
KENJI TAKADA2, SUMANT DWIVEDI3 & NADHRATUN NAIIM
MOBARAK1,*
1Department of Chemical Sciences, Faculty of Science and
Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia
2Energy and Environment Area, Graduate School of Advanced Science
and Technology, Japan Advanced Institute of Science and Technology, 1-1
Asahidai, Nomi, Ishikawa 923-1292, Japan
3Department of
Physics, Technical University of Denmark, Kongens Lyngby 2800, Denmark
Diterima:
27 Disember 2022/Diserahkan: 5 April 2023
Abstract
The range of available structure combinations to
synthesize polyimide (PI) makes it technically possible to have various
universal methods of producing PI film. The molecular
design, in which monomers used to synthesize PI are carefully selected to meet
specific application requirements as it influenced the properties of PI films.
This study aimed to outline the approach for film fabrication through
the casting of highly organo-soluble polyimide derived from 4,4’-methylene
diphenyl diisocyanate (MDI) with 4,4’-(hexafluoroisopropylidene) diphtalic
anhydride (6FDA) in different heating treatments. The solution drop amount was
tested in order to control the films colour uniformity. A flexible and less
crystalline MDI-6FDA film with an average thickness of 93 𝜇m was successfully developed
with a tensile strength of up to 57 MPa and an elongation at break of 5%. The
resulting MDI-6FDA film also demonstrated good optical transparency (T500 =
69%) with a cut-off wavelength at 371 nm and high
thermal resistance (T5 = 574 ℃) with a Tg temperature of up to 238 ℃. The
obtained film also shows good chemical resistance in methanol, ethanol,
isopropanol, and tetrahydrofuran solvents. These outcomes serve as a guideline for the fabrication of polyimide
films specifically derived from diisocyanate and dianhydride, with the
potential advantages to be used in optical applications.
Keywords: Diisocyanate; flexible films; optical transparency; polyimide;
tensile strength
Abstrak
Kepelbagaian
gabungan struktur yang tersedia untuk mensintesis poliimida secara teknikalnya
telah mewujudkan kaedah yang pelbagai untuk menghasilkan filem PI. Reka bentuk
molekul yang melibatkan pemilihan monomer yang digunakan dalam penyediaan PI
dipilih dengan teliti, bagi memenuhi keperluan aplikasi tertentu kerana ia
boleh mempengaruhi sifat filem PI. Kajian ini bertujuan untuk menggariskan
pendekatan bagi fabrikasi filem melalui penuangan poliimida organo-larut yang
diperoleh daripada 4,4'-metilena difenil diisosianat (MDI) dengan
4,4'-(heksafluoroisopropilidena) diftalik anhidrida (6FDA) dalam rawatan
pemanasan berbeza. Jumlah titisan larutan telah diuji bagi mengawal keseragaman
warna filem. Filem MDI-6FDA yang fleksibel dan kurang hablur dengan purata
ketebalan 93 𝜇m berjaya
dibangunkan dengan kekuatan tegangan sehingga 57 MPa dan pemanjangan memutus
pada 5%. Filem MDI-6FDA yang terhasil juga menunjukkan kelutsinaran optik yang
baik (T500 = 69%) dengan panjang gelombang terpenggal pada 371 nm
dan ketahanan terma yang tinggi (T5= 574 ℃) dengan suhu Tg sehingga 238 ℃. Filem yang dihasilkan juga
menunjukkan ketahanan kimia yang baik dalam pelarut metanol, etanol,
isopropanol dan tetrahidrofuran. Keputusan ini berfungsi sebagai garis panduan
dalam fabrikasi filem poliimida khususnya daripada diisosianat dan dianhidrida
dengan kelebihan potensi untuk digunakan di dalam aplikasi optik.
Kata kunci: Diisosianat; filem fleksibel; kekuatan tegangan; kelutsinaran
cahaya; poliimida
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*Pengarang untuk surat-menyuratemail:
nadhratunnaiim@ukm.edu.my
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