To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

From Wikipedia, the free encyclopedia

M5 fiber (polyhydroquinone-diimidazopyridine or PIPD) is a high-strength synthetic fiber first developed by the Dutch chemical firm AkzoNobel.[1] It is produced in the United States by the Magellan Systems International, which became a division of DuPont.

YouTube Encyclopedic

  • 1/1



M5 fiber is prepared by a condensation polymerization between tetraaminopyridine and dihydroxyterephthalic acid using diphosphorus pentoxide as a dehydrating agent. The polymer mixture is then heated and extruded to form brightly blue polymer fibers. The fibers are then washed extensively with water and base in order to remove the phosphoric acid generated by the hydration of diphosphorus pentoxide from the polymer.

To remove water from the fiber structure and enable the intermolecular hydrogen bonds to be created, thus increasing the strength of the polymer, the fiber is heated and exposed to controlled stress. This aligns the molecular structure of the fiber in a better configuration for tensile and compressive strength.


M5 has a tensile strength of 4 GPa[1] to 9.5GPa[2],. Other aramids- (such as Kevlar and Twaron) or UHMWPE-fibres (such as Dyneema and Spectra) range from 2.2 to 3.9 GPa.[3]

M5 has "very high levels" of fire resistance, flame retardancy, and chemical resistance, especially high for an organic fiber.[4] It is less brittle than carbon fiber and will yield when stretched.


  1. ^ a b Lammers, M; Klop, E.A; Northolt, M.G; Sikkema, D.J (1998). "Mechanical properties and structural transitions in the new rigid-rod polymer fibre PIPD ('M5') during the manufacturing process". Polymer. 39 (24): 5999–6005. doi:10.1016/S0032-3861(98)00021-4.
  2. ^ "M5 Fibre - an overview | ScienceDirect Topics". Retrieved 2023-02-09.
  3. ^ René Lohmann. "Teijin Aramid" (PDF). Teijin Aramid. p. 64.
  4. ^ "M5 Fibre - an overview | ScienceDirect Topics". Retrieved 2023-02-09.
This page was last edited on 9 February 2023, at 20:47
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.