Poly oxybenzoate-co-oxynaphthoate

The graph shows a rather small endotherm and a broad, possibly two-stage glass transition which stretches over more than 100 K. Without precise computation of the liquid and solid heat capacities, it would not have been possible to identify the glass transition and provide important characteristics for the practical application of the polymer. The broad glass transition is caused by the small amount of ordering in the 

Contribution of the Loe l 0 uche to trran Ec uilibrium to the Heat Capacity 

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Poly(oxybenzoate-co-oxynaphthoate). Figure 2.64 represents an even more complicated polymer system. In this case the macromolecule is the random copolymer poly(oxybenzoate-co-oxynaphthoate), a high-strength material (Vectra ). 

PETcoOB and POBcoON. A second example of thermal analysis of copolymers involves the two systems, poly(ethylene terephthalate-co-oxybenzoate), PETcoOB, and poly(oxybenzoate-co-oxynaphthoate), POBcoON. The structural formulas of the CRUs are as follows ... 

POB, see poly(4-hydroxybenzoic acid), as well as polyoxybenzoate POBcoON, see poly(oxybenzoate-co-oxynaphthoate)... 

Li XG, Huang MR (1999) Thermal decomposition kinetics of thermotropic poly (oxybenzoate-co-oxynaphthoate) Vectra copolyester. Polym Degrad Stab 64 81-90... 

In this section, copolymers of polyethylene are discussed, starting with low-density, branched polyethylene and culminating with crystallization, melting, and annealing of poly(ethylene-co-octene-l), also described as linear-low-density polyethylene, LLDPE. Furthermore, partial phase diagrams of poly(ethylene terephthalate-co-oxybenzoate), PETcoOB, andpoly(oxybenzoate-co-oxynaphthoate), POBcoON, are presented. The latter systems are examples of increasing chain stiffness by cocrystalUzation which leads to mesophase behavior (see Sect. 5.5). 

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