Kevlar in the construction industry - Revision history

Designing Buildings at 07:50, 17 February 2021

2021-02-17T07:50:27Z

← Older revision		Revision as of 07:50, 17 February 2021
Line 39:		Line 39:
	* Polyethylene.		* Polyethylene.

−	[[Category:~~Products_/_components~~]] [[Category:DCN_Product_Knowledge]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:Products_/_components]]

Designing Buildings: moved Kevlar to Kevlar in the construction industry

2020-09-14T10:08:50Z

moved Kevlar to Kevlar in the construction industry

← Older revision

Revision as of 10:08, 14 September 2020

Editor at 16:16, 3 July 2020

2020-07-03T16:16:51Z

← Older revision		Revision as of 16:16, 3 July 2020
Line 31:		Line 31:
	* Fabric structures.		* Fabric structures.
	* Fibre cement.		* Fibre cement.
		+	* Fire blanket.
	* Glass fibre		* Glass fibre
	* Glass reinforced concrete.		* Glass reinforced concrete.
Line 38:		Line 39:
	* Polyethylene.		* Polyethylene.

−	[[Category:Products_/_components]]	+	[[Category:Products_/_components]] [[Category:DCN_Product_Knowledge]]

Designing Buildings at 10:10, 2 December 2019

2019-12-02T10:10:23Z

← Older revision		Revision as of 10:10, 2 December 2019
Line 5:		Line 5:
	= Introduction =		= Introduction =

−	Kevlar is a strong, heat-resistant nylon-like polymer ~~material~~ invented in 1963 by Stephanie Kwolek, a US-based scientist, as part of her work for chemical giant DuPont. Kwolek had been researching ~~since 1950 into very~~ strong, synthetic textile fibres, particularly their manufacture from long chains of molecules~~, to be used~~ in light yet strong tyres.	+	Kevlar is a strong, heat-resistant nylon-like polymer invented in 1963 by Stephanie Kwolek, a US-based scientist, as part of her work for chemical giant DuPont. Kwolek had been researching strong, synthetic textile fibres since 1950, particularly their manufacture from long chains of molecules for use in light yet strong tyres.

−	~~Trademarked as~~ poly-para-phenylene terephthalamide~~, Kevlar~~ is a low weight, high strength material that is stable at high ~~temperatures~~ and ~~can be made into various useful products. This includes strong, durable, stiff, high-melting point~~ fibres ~~which~~ are claimed to be five times stronger than steel per unit weight; heat- or flame-resistant fabrics, radial and bicycle tyres, bulletproof vests ~~and – due to being waterproof –~~ walking boots~~. It is also used for~~ fibre-reinforced composite materials for aircraft panels, boat hulls and golf-club shafts.	+	Kevlar (poly-para-phenylene terephthalamide) is a low weight, high strength material that is stable at high temperature and whose fibres are claimed to be five times stronger than steel per unit weight (in tension). It is used for heat- or flame-resistant fabrics, radial and bicycle tyres, bulletproof vests, walking boots and fibre-reinforced composite materials for aircraft panels, boat hulls and golf-club shafts. It has also been used as a substrate for membranes used in fabric structures.

−	Like many innovations, Kevlar was discovered almost by accident. Kwolek was looking to create a better way of joining monomers (simple molecules) to polymers (longer chains) through low-temperature fusion. Instead of the clear solution she thought she would achieve, the result was an opaque liquid of low viscosity. When subsequently spun into fibres (ropes or fabric sheets) the liquid created a new type of synthetic material which, unlike nylon, did not break. In the patent application, Kwolek described it as a ‘highly orientable, crystallisable, filament-forming polyamide’.	+	Like many innovations, Kevlar was discovered almost by accident. Kwolek was looking to create a better way of joining monomers (simple molecules) to polymers (longer chains) through low-temperature fusion. Instead of the clear solution she thought she would achieve, the result was an opaque liquid of low viscosity. When subsequently spun into fibres (ropes or fabric sheets) the liquid created a new type of synthetic material which, unlike nylon, did not break easily. In the patent application, Kwolek described it as a ‘highly orientable, crystallisable, filament-forming polyamide’.

	Typically, Kevlar spun-fibres have a tensile strength of around 3,620mPA due to the many inter-chain bonds. Its relatively rigid molecules form mostly planar sheet-like structures which keep their strength and resilience down to around -196°C. At higher temperatures, the strength is slightly reduced.		Typically, Kevlar spun-fibres have a tensile strength of around 3,620mPA due to the many inter-chain bonds. Its relatively rigid molecules form mostly planar sheet-like structures which keep their strength and resilience down to around -196°C. At higher temperatures, the strength is slightly reduced.
Line 15:		Line 15:
	In 1971, Kevlar was marketed commercially and first used as a steel substitute in racing tyres. More recent uses have included armoured walls for panic rooms, marine current turbines and wind turbines, smartphones, expansion joints and hoses.		In 1971, Kevlar was marketed commercially and first used as a steel substitute in racing tyres. More recent uses have included armoured walls for panic rooms, marine current turbines and wind turbines, smartphones, expansion joints and hoses.

−	In ~~Building~~ construction, Kevlar can be formed into a sheet material for roofing, cladding and reinforcing. It was used unsuccessfully on the roof of the Olympic Stadium in Montreal which only lasted 10 years before it had to be renewed. It can be used to protect bank counters and reinforce seismic shear walls. However, it can be problematic to install and when used structurally, the calculations can be difficult. It is also very expensive.	+	In building construction, Kevlar can be formed into a sheet material for roofing, cladding and reinforcing. It was used unsuccessfully on the roof of the Olympic Stadium in Montreal which only lasted 10 years before it had to be renewed. It can be used to protect bank counters and reinforce seismic shear walls. However, it can be problematic to install and when used structurally, the structural calculations can be difficult. It is also very expensive.

−	== Three types of Kevlar and their uses: ==	+	Three types of Kevlar and their uses:

	* Kevlar – for car- and bicycle-tyre reinforcement to help resist punctures.		* Kevlar – for car- and bicycle-tyre reinforcement to help resist punctures.
−	* Kevlar 29 – armour for lightweight military vehicles and protection of personnel inside them~~. Offers protection from Molotov cocktails and fire bombing~~.	+	* Kevlar 29 – armour for lightweight military vehicles and protection of personnel inside them.
	* Kevlar 49 – used in aerospace and marine applications. In boat hulls, it can withstand tensile, torque and twisting forces and is stronger than fibreglass.		* Kevlar 49 – used in aerospace and marine applications. In boat hulls, it can withstand tensile, torque and twisting forces and is stronger than fibreglass.

Editor at 17:38, 29 November 2019

2019-11-29T17:38:40Z

← Older revision		Revision as of 17:38, 29 November 2019
Line 1:		Line 1:
	{\|		{\|
−	\| [[File:~~Kevlar Pixabay~~.jpg]]	+	\| [[File:Kevlar_Pixabay.jpg\|link=File:Kevlar_Pixabay.jpg]]
	\|}		\|}

Line 19:		Line 19:
	== Three types of Kevlar and their uses: ==		== Three types of Kevlar and their uses: ==

−	* Kevlar – for car- and bicycle-tyre reinforcement to ~~helps~~ resist punctures.	+	* Kevlar – for car- and bicycle-tyre reinforcement to help resist punctures.
	* Kevlar 29 – armour for lightweight military vehicles and protection of personnel inside them. Offers protection from Molotov cocktails and fire bombing.		* Kevlar 29 – armour for lightweight military vehicles and protection of personnel inside them. Offers protection from Molotov cocktails and fire bombing.
	* Kevlar 49 – used in aerospace and marine applications. In boat hulls, it can withstand tensile, torque and twisting forces and is stronger than fibreglass.		* Kevlar 49 – used in aerospace and marine applications. In boat hulls, it can withstand tensile, torque and twisting forces and is stronger than fibreglass.

Editor: Created page with "{| | File:Kevlar Pixabay.jpg |} = Introduction = Kevlar is a strong, heat-resistant nylon-like polymer material invented in 1963 by Stephanie Kwolek, a US-based scientist, ..."

2019-11-29T17:37:56Z

Created page with "{| | File:Kevlar Pixabay.jpg |} = Introduction = Kevlar is a strong, heat-resistant nylon-like polymer material invented in 1963 by Stephanie Kwolek, a US-based scientist, ..."

New page

{|
| [[File:Kevlar Pixabay.jpg]]
|}

= Introduction =

Kevlar is a strong, heat-resistant nylon-like polymer material invented in 1963 by Stephanie Kwolek, a US-based scientist, as part of her work for chemical giant DuPont. Kwolek had been researching since 1950 into very strong, synthetic textile fibres, particularly their manufacture from long chains of molecules, to be used in light yet strong tyres.

Trademarked as poly-para-phenylene terephthalamide, Kevlar is a low weight, high strength material that is stable at high temperatures and can be made into various useful products. This includes strong, durable, stiff, high-melting point fibres which are claimed to be five times stronger than steel per unit weight; heat- or flame-resistant fabrics, radial and bicycle tyres, bulletproof vests and – due to being waterproof – walking boots. It is also used for fibre-reinforced composite materials for aircraft panels, boat hulls and golf-club shafts.

Like many innovations, Kevlar was discovered almost by accident. Kwolek was looking to create a better way of joining monomers (simple molecules) to polymers (longer chains) through low-temperature fusion. Instead of the clear solution she thought she would achieve, the result was an opaque liquid of low viscosity. When subsequently spun into fibres (ropes or fabric sheets) the liquid created a new type of synthetic material which, unlike nylon, did not break. In the patent application, Kwolek described it as a ‘highly orientable, crystallisable, filament-forming polyamide’.

Typically, Kevlar spun-fibres have a tensile strength of around 3,620mPA due to the many inter-chain bonds. Its relatively rigid molecules form mostly planar sheet-like structures which keep their strength and resilience down to around -196°C. At higher temperatures, the strength is slightly reduced.

In 1971, Kevlar was marketed commercially and first used as a steel substitute in racing tyres. More recent uses have included armoured walls for panic rooms, marine current turbines and wind turbines, smartphones, expansion joints and hoses.

In Building construction, Kevlar can be formed into a sheet material for roofing, cladding and reinforcing. It was used unsuccessfully on the roof of the Olympic Stadium in Montreal which only lasted 10 years before it had to be renewed. It can be used to protect bank counters and reinforce seismic shear walls. However, it can be problematic to install and when used structurally, the calculations can be difficult. It is also very expensive.

== Three types of Kevlar and their uses: ==

* Kevlar – for car- and bicycle-tyre reinforcement to helps resist punctures.
* Kevlar 29 – armour for lightweight military vehicles and protection of personnel inside them. Offers protection from Molotov cocktails and fire bombing.
* Kevlar 49 – used in aerospace and marine applications. In boat hulls, it can withstand tensile, torque and twisting forces and is stronger than fibreglass.

= Related articles on Designing Buildings Wiki =

* Carbon fibre market.
* Composites.
* Concrete.
* ETFE.
* Fabric structures.
* Fibre cement.
* Glass fibre
* Glass reinforced concrete.
* Graphene in civil engineering.
* Nylon.
* Plastic.
* Polyethylene.

[[Category:Products_/_components]]