The document presents a presentation about Captain Mohiuddin Jahangir, a significant figure in the 1971 Bangladesh Liberation War, highlighting his bravery and the honor he received posthumously. Additionally, it discusses Polyvinyl Alcohol (PVA), detailing its properties, manufacturing process, and various applications across medical and industrial fields. PVA is recognized for its versatility and effectiveness as a polymer in different contexts, including adhesives and textile reinforcement.

1. WELCOME TO OUR PRESENTATION
PRESENTED BY:
GROUP – G
GROUP NAME: BIR SRESHTHO SHAHEED MOHIUDDIN JAHANGIR
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2. Bir Sreshtho Shaheed Mohiuddin Jahangir
1949 - 1971

3. Captain Mohiuddin Jahangir was an officer in the Pakistan Army and joined the Mukti
Bahini during the 1971 Liberation War. He was born on 7 March 1949 in the village of
Rahimgonj under Babugonj Upazila of Barisal district. He was an officer in Sector 7 of
the Muktibahini. In 1971 ,he was killed in an attempt to break through enemy defences
on the bank of the Mahananda River. His initiative seriously undermined the Pakistani
Army's resistance in the area; eventually the Muktibahini overcame and took the
position from the Pakistan army. The main gate of Dhaka Cantonment, "Shaheed
Jahangir Gate", is named in his honour. He was awarded the highest recognition of
bravery inBangladesh, Bir Sreshtho

4. POLYVINYLALCOHOL (PVA)

5. Introduction
 PVA (Polyvinyl alcohol) is known as a synthetic polymer that is soluble in
water.
 It is effective in film forming, emulsifying, and has an adhesive quality. It has
no odor and is not toxic, and is resistant to grease, oils, and solvents.
 It is ductile but strong, flexible, and functions as a high oxygen and aroma
barrier.
 It is soluble in water, slightly soluble in ethanol, but insoluble in other organic
solvents. Typically a 5% solution of polyvinyl alcohol exhibits a pH in the
range of 5.0 to 6.5. Polyvinyl alcohol has a melting point of 180 to 190°C. It
has a molecular weight of between 26,300 and 30,000, and a degree of
hydrolysis of 86.5 to 89%.

6. Chemical structure of PVA

8. Manufacturing of PVA
PVA is not prepared by polymerization of the corresponding monomer as the
monomer, vinyl alcohol, is less thermodynamically stable with respect to its
tautomer acetaldehyde. PVA instead is prepared by first polymerizing vinyl acetate,
and the resulting polyvinyl acetate is converted to the PVA. Other precursor polymers
are sometimes used, with format, chloroacetate groups instead of acetate. The
conversion of the polyesters is usually conducted by base-catalised transesterification
with ethanol:
The properties of the polymer depend on the amount of residual ester groups

9. Applications

10. Applications
 Used with polyvinyl acetate to make Elmer's glue
 In eye drops and hard solution as a lubricant.
 Used in protective chemical-resistant gloves
 As a for specimen collection, especially stool samples
 In water transfer printing process
 PVA fiber, as reinforcement in concrete

11. Conclusion
PVA is an artificial polymer that has been used in the
medical and other fields for the last 30 years. Polyvinyl
alcohol is a resin, a natural or synthetic organic compound
made of non-crystalline or viscous substance. Polyvinyl
alcohol is widely used to strengthen textile yarn and papers,
particularly to make the latter more resilient to oils and grease.
It is also used in freshwater sports fishing. PVA is added into
bags that are filled with oil-based or dry fishing bait and
attached to the hook.

13. Thank You