Linear aliphatic flexible polyester

CLASS Polyesters linear aliphatic flexible polyesters thermoplastics STRUCTURE O... 

Chem. Descrip. Sat., aliphatic, linear, hydroxyl-terminated polyester polyol Uses Polyester for flexible foams, sol n. coatings and adhesives, one-shot castables, castable prepolymers, and thermoplastic elastomers Features PUs exhibit solv. resistance, low temp, properties, low modulus elastomers, and resiliency Properties Liq. at R.T. 

Although PET and PBT are widely used, better thermal and mechanical properties are desired for some applications. Higher performance in semiaromatic polyesters was obtained from polyalkene naph-thalates. These semicrystalline polyesters are prepared by the condensation polymerization of naphtha-lene-2,6-dicarboxylic acid and flexible aliphatic diols. The naphthalene moiety imparts stiffness to the linear polymer backbone, leading to improved physical and mechanical, barrier, chemical resistance properties, and UV-ray screening performance. Poly(ethylene naphthalene-2,6-dicarboxylate), PEN, became commercially available from Teijin Ltd. in the early 1970s. PEN has a Tg and of 125 and 268°C, respectively [34]. Its structure appears in Fig. 1.18. 

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