Cyclic Butylene Terephthalate CBT

Dow Automotive entered an alliance with Cyclics to develop cyclic butylene terephthalate (CBT) resins for automotive applications. Research will focus on a number of automotive structural composites, including vertical and horizontal body panels and truck boxes. The companies expect that components will be able to be formed using a number of techniques, including compression and injection moulding. CBT resins will contribute to lighter weight vehicle design and be recyclable. 

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Another example of simultaneous detection of reaction and structural changes from changes in electrical conductivity was presented by Hakme et al. (2007), who studied polymerization of cyclic butylene terephthalate (CBT). They observed small changes in conductivity due to polymerization, but if the reaction temperature was lower than 227°C, that is, melting of a crystalline phase of the product, poly(butylene terephthalate), even greater change was observed due to crystallization. 

Wu and Yang prepared poly(butylene terephthalate) (PBT)-grafted MWCNTs by ROP of cyclic butylene terephthalate (CBT) oligomers initiated with Sn-functionalized MWCNTs in bulk at 200 °C for 30 min. TEM measurements showed that the thickness of the PBT shell was approximately 6 nm. The resulting MWCNT-g-PBT could be well dispersed in phenol/ tetrachloroethane wlw = 60 40) mixed solvent. 

A number of new high performance materials have also recently been developed. These include cyclic olefin copolymers (COC), syndiotactic polyst5rene, cyclic butylene terephthalate (CBT) and copolycarbonate. 

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