Me461 Final Presentation Kevlar

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Poly-Para-Phenylene-Terephthalamide[-CO-C6H4-CO-NH-C6H4-NH-]n

Let’s just call it...

ME46100 – Material ScienceDepartment of Mechanical EngineeringThe Grove School of EngineeringDec 20th, 2011

Speakers:Banga, BankaJohn-Louis, CaryPosluk, Erhan

Overview:• Brief History

- Who invented Kevlar?• Structure• Properties

- Mechanical- Electrical

• Processing- How is Kevlar made?

- Performance- Body Armor- Flexible risers- Kevlar reinforced tires

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Brief HistoryBanga, Banka

Structure

Properties

Processing

Performance

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History of Kevlar:

Inventor: Stephanie Kwolek- Born in 1923- Developed Kevlar at Dupont in the year 1965

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Brief History

StructurePosluk, Erhan

Properties

Processing

Performance

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Brief History

Structure

PropertiesJohn-Louis, Cary

Processing

Performance

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Brief History

Structure

Properties

ProcessingBanga, Banka

Performance

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Different types of Kevlar:

Kevlar is available in many different forms:- Kevlar XP- Kevlar 29- Kevlar 49- Kevlar 100- Kevlar 119- Kevlar 129

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How is Kevlar made?

[1,4-phenylene-diamine + terephthaloyl chloride] [ poly-para-phenyleneterephthalamide]

Kevlar is made in two stages:1) Chemistry: The basic plastic (poly-para-phenyleneterephthalamide) is produced.2) Practical Material: The chemical product is turned into long fibers called ‘Kevlar’.

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Source: DuPont

Making Kevlar fiber step-by-step:KEVLAR

Trans vs. cis conformation:

Figure (a) & (b) shows trans and cis conformation of amide groups in Nylon 6,6. And, figure (c) & (d) shows cis conformation of amide groups in Kevlar

(a)

(c) (d)

(b)

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Trans-conformation of Kevlar:

Figure (a) & (b) shows trans conformation of amide groups in Kevlar.

(a)

(b)

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Brief History

Structure

Properties

Processing

Performance

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Applications of Kevlar: Personal ArmorKevlar is used in personal armor:

- Resistant to cut, high impact and heat.

Combat helmets

Bullet-proof face masks

Bullet-proof vests

Source: DuPontSource: Personal Armor, Wikipedia

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Applications of Kevlar: Kevlar Reinforced Risers

The benefits of risers reinforced with Kevlar over steel risers are:- Light and easy to handle- Can be spooled for transportation- Can be laid quickly- No welding is necessary- Rapid installation- Long life- Minimum maintenance- Improve operating cost- Corrosion resistant- Do not deteriorate in terms of flow performance-

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Applications of Kevlar: Kevlar Reinforced Tires

Source: Dannyid, Flickr.Source: http://sinozhome.en.china.cn

Kevlar is used in tires to preventpuncture due to its excellent heat resistance.

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Other Applications:

• Reinforcement in car tyres• Automobile part.• Building material.

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