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Polyethylene naphthalate
Polyethylene naphthalate (PEN) (Poly(ethylene 2,6-naphthalate) is a polyester with good barrier properties (even better than Polyethylene terephthalate). Because it provides a very good oxygen barrier, it is particularly well-suited for bottling beverages that are susceptible to oxidation, such as beer. It is also used in making high performance sailcloth. It also has been found to show supreme scintillation properties and is expected to replace classic plastic scintillators.〔(Nakamura et al., Evidence of deep-blue photon emission at high efficiency by common plastic; Europhysics Letters )〕
==Production==
Polyethylene Naphthalate (PEN, Poly(ethylene-2,6-naphthalene dicarboxylate, CAS No: 25853-85-4) is a polyester polymer of naphthalene-2,6-dicarboxylate and ethylene glycol.
There are two major manufacturing routes for PEN, i.e. an ester or an acid process, named according to whether the starting monomer is a diester or a diacid of naphthalene, respectively. In both cases for PEN, the glycol monomer is ethylene glycol.
Solid-state polymerization (SSP) of the melt-produced resin pellets is the preferred process to increase the average molecular weight of PEN.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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