PEN plastic from Japan
Polyethylene naphthalate (poly(ethylene 2,6-naphthalate) or PEN) is a polyester derived from naphthalene-2,6-dicarboxylic acid and ethylene glycol. As such it is related to poly(ethylene terephthalate), but with superior barrier properties.
Benefits when compared to polyethylene terephthalate
The two condensed aromatic rings of PEN confer on it improvements in strength and modulus, chemical and hydrolytic resistance, gaseous barrier, thermal and thermo-oxidative resistance and ultraviolet (UV) light barrier resistance compared to polyethylene terephthalate (PET). PEN is intended as a PET replacement, especially when used as a substrate for flexible integrated circuits.
Polyethylene naphthalate (PEN) resin became popular in various fields after U.S. company Amoco Chemicals started commercial production of naphthalenedicarboxylic acid (NDC) , a raw material of PEN, in 1995. In 1964, 31 years before that, Teijin started development of PEN and commercialized as Teonex®. Since then, Teonex® has been popular as a functional material for industrial parts and wrapping materials for food and drugs, and still steadily increasing the area of applications. Teonex® is a crystalline thermoplastic polyester, a polycondensate of NDC as an acid component and ethylene glycol as a glycol component, manufactured in a process similar to that of polyethylene terephthalate (PET), a typical polyester. The property of Teonex® is considered superior to that of PET. Teonex® is crystalline resin, crystallized slowly, making it easier to shape transparent molded products. Teonex® has a superior chemical and scratch resistance compared to polycarbonate (PC) resin, a typical resin used in transparent molded products.
MVR m3/10min ISO 1133 300℃, 1.2kgf 18 5 - 8
Density kg/m3 ISO 1183 - 1,330 1,330 1,330 1,200
Tensile modulus MPa ISO 527-1
ISO 527-2 1mm/min 2,200 2,200 2,300 2,400
Tensile yield strength MPa 50mm/min 80 80 58 61
Tensile yield strain % 50mm/min 7 7 4 6
Tensile stress at break MPa 50mm/min 38 40 28 75
Tensile strain at break % 50mm/min 15 50 >200 >50
Flexural modulus MPa ISO 178 2mm/min 2,250 2,200 2,500 2,300
Flexural strength MPa 2mm/min 99 98 81 91
Charpy impact strength kJ/m2 ISO 179 Un-notched 98 NB NB NB
Notched 2.0 2.8 3.5 76
Temperature of eflection under load ℃ ISO 75-1
ISO 75-2 1.80MPa 91 92 65 129
0.45MPa 105 107 68 142
Rockwell hardness - ASTM D 785 M scale 107 107 80 67
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