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Polychloroprene (Neoprene)

Chemistry: Polymer Research Project (March 6, 2014)
by

Jenny Lin

on 6 March 2014

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Transcript of Polychloroprene (Neoprene)

Polychloroprene
What is Polychloroprene?
Commercial name:
Neoprene

IUPAC Name:
[poly(2-chloro-1,3-butadiene)]

synthetic rubber
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)

1920s
increased demand for natural rubber

1930
Wallace Carothers
polymerization experiment: produced rubber-like substance from chloroprene
Arnold Collins
first time manufacturing chloroprene: reacted monovinyl acetylene (MVA) with hydrogen chloride gas

1932
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.

Rubber Properties
Good mechanical strength
- regains original shape after being pulled or pressed
High ozone and weather resistance
Good aging resistance
Low flammability
Good resistance toward chemicals
Moderate oil and fuel resistance
Adhesion to many substrates

Precautions
may contain allergens
thiourea residues can cause dermatitis or eczema
degrades in the presence of some common chemicals
Advantages
Weather Resistant
- 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
Disadvantages
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?
Information
http://www.tiffen.com/Zing802list.PDF
http://www.delford-industries.com/rubber_materials.html
http://www.seventhwave.co.nz/site/seventhwave/files/Neoprene_Inside_Story.pdf
http://www.iisrp.com/webpolymers/04finalpolychloropreneiisrp.pdf http://www.dupont.com/products-and-services/plastics-polymers-resins/elastomers/brands/neoprene-polychloroprene.html
http://www.seventhwave.co.nz/site/seventhwave/files/Neoprene_Inside_Story.pdf
http://dshenai.wordpress.com/2013/04/18/neoprene-was-invented-83-years-ago-on-april-17-1930/
http://www.ehow.com/info_8729467_merits-limitations-polychloroprene-rubber.html#ixzz2v3wPl1hB
http://www.poly-corp.com/default.asp

Images
http://0.tqn.com/d/chemistry/1/0/2/o/1/polychloroprene-or-neoprene.png
https://encrypted-tbn3.gstatic.com/images?q=tbn:ANd9GcQHHMaahdYm0K8NghcBMa-pvHeIHkvgDTw2amgyCZY8M79H1Z5h
http://win1.yuank.net/s/983/systemup/neoprene%20cloth-016.jpg
http://www.gemplers.com/img/neoprene-gloves-wrist-5600.jpg
Bibliography
Polychloroprene
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.
Interesting Facts!
Companies
DuPont

Showa Denko (manufactures Polychloroprene in both solid and liquid dispersions)

Denki Kagaku Kogyo
Full transcript