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Transcript of Polychloroprene (Neoprene)
What is Polychloroprene?
produced through polymerization of chloroprene
One of the most important speciality elastomers
annual consumption of nearly 300,000 tons worldwide
When and Whom?
Dr. Julius Arthur Nieuwland
professor of chemistry at the University of Notre Dame.
researched acetylene chemistry
produced divinyl acetylene (elastic compound)
increased demand for natural rubber
polymerization experiment: produced rubber-like substance from chloroprene
first time manufacturing chloroprene: reacted monovinyl acetylene (MVA) with hydrogen chloride gas
First production by DuPont (American chemical company)
popularity shot up due to favourable combination of technical properties
The Manufacturing Process
Neoprene is made through a chemical reaction using chloroprene:
1. Chloroprene binds all the molecules of the reaction together, leaving polychloroprene chips.
2. Chips are melted and mixed together with foaming agents and carbon pigments.
3. Heated to expand.
4. Sliced like bread, leaving smooth neoprene sheets.
5. Nylon fabric laminated to the neoprene to give it strength.
Good mechanical strength
- regains original shape after being pulled or pressed
High ozone and weather resistance
Good aging resistance
Good resistance toward chemicals
Moderate oil and fuel resistance
Adhesion to many substrates
may contain allergens
thiourea residues can cause dermatitis or eczema
degrades in the presence of some common chemicals
- E.g. ozone, sunlight, and rain
High resistance to oil, fuels, and other solvents like inorganic chemicals
Less susceptible to aging in extreme heat and relatively Inflammable
Durable and flexible
Doesn't deteriorate as fast as other rubber products
Resource-intensive production process led to high production cost (until 1960s)
Degradation occurs at temperatures above 100°C
High water absorption rate
Poorly resistant to hydrocarbons
May stiffen at low temperatures
Where Is Neoprene Used?
Thanks for Listening!
By: Maitry Chowdhury, Jenny Lin, Anita Lin, & Jacky Wang
From 1930 to 1939, sales of neoprene were generating profits over $300,000 for the DuPont company.
Extra-vehicular activity suits worn by NASA astronauts contain neoprene-coated nylon.
Showa Denko (manufactures Polychloroprene in both solid and liquid dispersions)
Denki Kagaku Kogyo