Organic polymers that conduct electricity are called conducting polymers.. The biggest advantage of conductive polymers is their processability, mainly by dispersion... In 1970
Trang 1Polyacetylene
Trang 2 Organic polymers that conduct
electricity are called conducting
polymers.
Such compounds may have metallic
conductivity or can be semiconductors.
The biggest advantage of conductive
polymers is their processability, mainly
by dispersion.
Trang 3 In 1970 H.shirakawa reported high
molecular weight polyacetylene film by
passing dry acetylene gas over
Ziegler-Natta catalyst of titanium tetrabutoxide triethyl aluminium in toluene at -78℃
It was obtained on the surface of the
catalyst.
And also in the two forms known as cis and trans.
Trang 4(2) Is trans polyacetylene.
Trang 5 The role of a dopant is to either add or remove electrons to the polymer.
(2) Reductive or n-doping
Trang 6
The oxidizing agents for P-doping are like iodine vapours,I dissolved in CCl , ₂ ₄ HBF , HClO , Br etc ₄ ₄ ₂
(CH) n (CH) → n I ⁺ ₃⁻
The conduction in this type of doping
increases up to 10⁵ s/cm.
Trang 7 The reducing agents for n-doping are like Na metal ,FeCl , lithium metal ₂
,sodium naphthalide etc.
(CH) n → (CH) Na ⁻ ⁺
Negative charge resonates throughout the chain and transferred to
neighbouring chains through Na ⁺
during conduction.
Trang 8 For making rechargeable batteries.
Used as sensors for phenol , O etc at ₂ low concentrations.
For manufacture of transistors ,LEDs, lasers and solar cells.
In telecommunication systems
In the construction of photovoltaic
cells.
Trang 9Solar cell
Light-emitting diodes
Shield for computer screen against electromagnetic
"smart" windows radiation