Synthesis And Structure Properties Relationship (SPR) Polyimide Containing Silicone Segment For Optoelectronic Application
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Date
2011-10
Authors
Othman, Muhammad Bisyrul Hafi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Polyimide (PI) system which derived from monomer BAPP/BPDA were
successfully synthesized and structure-properties-relationship (SPR), silicon segment
whose role on PI system has been investigated. Two different methods were used to
introduce segments of Si-O-Si which are into the backbone chain through conventional
copolymerization and the matrix of PI via sol-gel methods, respectively to prepare the
copolymer polydimethylsiloxane (PIS) and the composite polyimide silica hybrid
(PSH). The synthesized PIs yield > 80%, with moderate inherent viscosity and
molecular weight is with a narrow molecular weight distribution. The presence of
silicone segments in the PI backbone has been successfully verified by FT-IR, HNMR
and EA, the PI films were completely imidized. Typically the cured PI showed stability
in acidic and alkaline medium and the combination Si-O-Si into chain backbone or
particles into the matrix increases its solubility in common polar aprotic solvents. SEM
showed an almost homogenous phase between PI and silicon segment for the PI system
S-2 and S-3, while the PI system S-4 revealed the inorganic particles are distributed
uniformly in the PI matrix. Introduction Si-O-Si segment into the PI backbone,
consistently reducing the glass transition temperature, hardness, refractive index,
dielectric constant and dielectric loss compared to the parent (S-1). While the
introduction Si-O-Si particles into the PI matrix increased glass transition temperature,
hardness, refractive index, dielectric constant and dielectric loss of PI system in
comparison with its parent PI. TGA studies showed that the final degradation
temperature (char residues 55 to 60% at 800 ° C) segment has been enhanced due to the
presence of Si-O-Si, both in the backbone or matrix-matrix PI. PI System yellowish
color display with a consistently, suitable to the transition π - π * transition due to the
complex charge (CTC) aromatic wavelength 450 nm. Optical and electrical data shows
the experimental results within the range accepted for optoelectronic device
applications.
Description
Keywords
Synthesis polyimide containing silicone segment , for optoelectronic application