Polyethylene naphthalate

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Structural formula
Structure of polyethylene naphthalate
General
Surname Polyethylene naphthalate
CAS number 25853-85-4
Monomers Ethylene glycol and dimethyl 2,6-naphthalenedicarboxylate
Molecular formula of the repeating unit C 14 H 10 O 4
Molar mass of the repeating unit 242.23 g mol −1
Type of polymer

polyester

Brief description

colorless to slightly cloudy

properties
Physical state

firmly

density

1.36 g cm −3

Melting point

255 ° C

modulus of elasticity

5-5.5 GPa

Water absorption

0.4%

solubility

insoluble in water

Electric conductivity

10 −15 S cm −1 (bulk)

tensile strenght

200 MPa

Elongation at break

60%

Chemical resistance
  • good against alcohols, aromatic hydrocarbons, fats and oils, ketones, alkalis
  • good to bad against concentrated acids
Thermal expansion coefficient

20–21 · 10 −6 K −1

safety instructions
GHS labeling of hazardous substances
no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Polyethylene naphthalate ( abbreviation PEN , trade names including: Kaladex, Teonex) is a thermoplastic from the polyester family produced by polycondensation .

Extraction and presentation

PEN is produced by polycondensation from ethylene glycol and dimethyl 2,6-naphthalenedicarboxylate (2,6-NDC, CAS number: 840-65-3).

properties

PEN has been known since the early 1980s. PEN differs from PET in its higher gas tightness and heat resistance , as well as the mechanical values ​​(modulus of elasticity, strength) and increased chemical, UV and hydrolysis resistance . In contrast, the flexural strength is lower and the price is higher. PEN has good properties as an organic scintillator with an emission wavelength in the visible range (blue) in contrast to UV in PET. PEN can be used as a copolymer ET / EN , as a polymer blend PET + PEN and not just as a homopolymer .

use

Due to its properties, PEN proves to be an alternative packaging for all food that is hot-filled. The increased glass transition temperature means that PEN containers can be washed at up to 85 ° C (PET 60 ° C). Other areas of application for PEN are packaging (films and threads), containers and medical devices. They are also used in plastic film capacitors and as loudspeaker membranes .

Web links

  • Data sheet [1] (PEN film) from Synflex

Individual evidence

  1. ↑ a b c d e f g h i j k Entry polyethylene naphthalate at Goodfellow, accessed on November 15, 2017.
  2. ↑ a b Flexguard 2137 datasheet from Federal Mogul , accessed November 15, 2017.
  3. ↑ a b Safety data sheet page no longer available , search in web archives: P-Type (600 series) at Nextrusion (PDF; 32 kB), accessed April 2, 2013.@1@ 2Template: Dead Link / www.qualifil.de
  4. ↑ a b Martin Orzinski: Investigation of the permeation of inorganic gases and organic compounds through barrier-improved plastic bottles and their measurement. Dissertation, Technical University of Berlin, 2007. urn : nbn: de: kobv: 83-opus-14914 .
  5. ↑ H. Nakamura, Y. Shirakawa, S. Takahashi, H. Shimizu: Evidence of deep-blue photon emission at high efficiency by common plastic. In: Europhysics Letters. 95, 2011, p. 22001, doi: 10.1209 / 0295-5075 / 95/22001 .
  6. ^ Wolfgang Kaiser : Synthetic chemistry for engineers. Carl Hanser Verlag, Munich / Vienna 2006, ISBN 978-3-446-22069-0 .