Carbocyclic Polymers

Among these compounds containing anthracene, benzene, naphthalene and other aromatic compounds are of particular interest. 

The backbone of polycyclic molecules may involve either only rings (polyphenylenes) or additionally, aliphatic groups, e.g., [poly(p-xylylene)]. 

The methylene bonds are the weakest in the poly(p-xylene) macrochain. The cleavage of such bonds causes the formation of two macroradicals, which should decompose via a chain mechanism to yield monomer  

The activation energy of the thermal degradation of polyphenyl and poly(p-xylylene) as determined by their maximum decomposition rates are 209 and 305.1 kj/mol, respectively. 

It has been established [39] that polyacenaphthylene which is produced on polymerisation of the monomer (125 °C) begins to decompose at temperatures above 297 °C to form the initial monomer  

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Table 1. Main-Chain Acyclic Carbon Polymers 11-451 Table 2. Main-Chain Carbocyclic Polymers I 1-464...

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. 

VI/218 CLASS TRANSITION TEMPERATURES OF POLYMERS TABU 2. MAIN-CHAIN CARBOCYCLIC POLYMERS... 

Viscosity. Molecular Weight Relationships of Main-Chain Carbocyclic Polymers... 

The discovery of the metal-like properties of conducting polymers has once again focused attention on the oxidation and reduction characteristics of aromatic systems. It turns out that most of these conducting materials consist of chainlike connected carbocyclic or heterocyclic aromatics [94-97]. 

Polymers constituted of repeatedly fused or spiro carbocycles... 

The constitutional repeating unit resulting from a ladder or spiro polymer consisting of a repeating carbocycle is a tetravalent acyclic group. 

The seniority of different types of subunits is heterocyclic rings > heteroatoms or acyclic subunits containing heteroatoms > carbocyclic rings > acyclic subunits containing only carbon. The presence of various types of atoms, groups of atoms, or rings that are not part of the main polymer chain but are substituents on the CRU do not affect this order of seniority. 

The wide structural diversity in the tricyclic compounds considered in this chapter ensures that they have found an equally diverse range of applications. The applications previously outlined <1996CHEC-II(7)841> have continued to be important and have been further developed. Carbocyclic anhydrides and imides continue to find application for the synthesis of polymeric materials which are used extensively in microelectronics due to their excellent thermal and electrical properties <2001PP03>. Similarly, polymers containing benzobisthiazoles, benzobisoxazoles, and... 

The reactivity of substituents on the heterocyclic and the carbocyclic nuclei of dibenz[6,/]azepines has been reviewed (74CRV101). Polymers of iV-acryloyl-10,11 -dihy-drodibenz[6,/]azepines have been prepared (78MI51603). 

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