Heteroatomic polymers

Sillion B (1973) Polyimides and other heteroatomic polymers. In Allen G, Bevington JC, Eastmond GC, Ledwith A, Russo S, Sigwalt P (eds) Comprehensive polymer science, vol 5, The synthesis, characterization, reactions and applications of polymers. Pergamon Press, Oxford, p 499... 

When the spacing between the asymmetric centers increases, as in the heteroatomic polymer poly(propylene oxide), the isotactic and syndiotactic structures become less easily recognized in planar projection. Using an extended zigzag structure, the isotactic form now has its substituents alternating across the plane containing the main chain bonds. 

Zelenay et al. explored Co-polypyrrole (CoPPy) material as a PEM fuel-cell cathode catalyst. The composite CoPPy catalyst, even without a heat treatment, could generate a power density of 0.15Wcm in a H2—O2 fuel cell and displayed no signs of performance degradation for more than 100 h. Their results showed that heteroatomic polymers can be used not only to stabilize the non-noble metals in a PEM fuel cell environment but also to generate active sites for the ORR. Study of the interaction between the catalyst and oxygen also demonstrated that CoPPy... 

Wu G, Mack NH, Gao W, Ma S, Zhong R, Han J, Baldwin JK, Zelenay P (2012) Nitrogen-doped graphene-rich catalysts derived from heteroatom polymers for oxygen reduction in nonaqueous lithium-02 battery cathodes. ACS Nano 6 9764—9776... 

In these macromolecules the group R is an organic residue. Hence, an appropriate general name for these compounds is that of inorganic-organic or heteroatom polymers. 

Polymers are subdivided into principle classes by the composition of their repeating chain segment acyclic carbon polymers, carbocyclic polymers, acyclic heteroatom polymers, heterocyclic polymers, and copolymers. All entries are placed in the most senior class their structure commands (109,110) and appear in only one class. The subclasses and their entries are organized in alphabetical order. 

TABLE 3. MAIN-CHAIN ACYCUC HETEROATOM POLYMERS... 

Table 3. Main-Chain Heteroatom Polymers VI1-32 Table 8. Main-Chain Heteroatom Polymers VI1-60...

Viscosity Molecular Weight Relationships of Main-Chain Heteroatom Polymers VII / 33... 

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