Cyclohexane/poly

The higher seniority of cyclic suhunits over acyclic subunits (rule 3) and the higher seniority of a subunit with lower locant(s) relative to the same subunit with higher locant(s) (rule 7b) yield the CRU XVI with the name poly(cyclohexane-l,3-diylcyclohexane-l,4-diyl-l-methylpropane-l,3-diyl). Note that all acyclic subunits except CH2 and CH2CH2 are named as alkane-a, co-diyl. CH2 and CH2CH2 subunits are named methylene and ethylene, respectively. 

PCTG Poly (cyclohexane dimethanol-co-ethylene glycol terephthalate)... 

PCX, PCTG Poly(cyclohexane terephthalate- glycol), copolymer of cyclohexanedimethanol (66 mol%), ethylene glycol, (34 mol%), and terephthalic acid... 

Polycyclohexylendeimethylene tere-phthalate [PCT, poly( cyclohexane-1,4-dimethylene terephthalate)] n. The newest member of the commercial thermoplastic-polyester family, PCT is produced by reacting 1,4-cyclohexane dimethanol with dimethyl terephthalate. It is superior to its siblings (PET and PBT) in that it can serve... 

D.J. Brunelle, C. Berti, A. Celli, M. Colonna, M. Fiorini, E. Marianucci, M. Messori, F. Pilati, L. Sisti, and P. Marchese, Method for preparing poly(cyclohexane-l,4-dicarboxylate)s from cyclohexane-1,4-dicarboxylic acid, and composition, US 20(B0232958 Patent, assigned to General Electric, December 18,2003. 

Table 10.3. Comparative properties of various forms of poly (ethylene terephthalate) and poly (cyclohexane-1,4-dimethylene terephthalate)...

This polymer has a sUghtly stiffer chain than poly (ethylene terephthalate) and hence the glass-transition temperature (about ISO C) and melting point (about 290°C) are somewhat higher. The polymer is available in both fibre and film form and is of interest mainly because of its superior resistance to water and weathering. Some properties of poly(cyclohexane-1,4-dimethylene terephthalate) are shown in Table 10.3. 

Cohen and co-workers also reported the first syndioselec-tive copolymerization of cyclohexene oxide and CO2 (Scheme 17). Using complex [rac-(salpr- Bu)CoBr] (18), poly (cyclohexane-1,2-diyl carbonate) was formed with 80% r-dyads, as determined by C NMR spectroscopy. The carbonyl... 

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