摘要:

For decades, organic polymers were important only as insulators in the electornic industries. Research on electroactive properties was confined mainly to inorganic materials such as barium titanate, lead zirconate titanate, quartz, silicon, cadmium sulfide, and gallium arsenide. In the 198s, organic polymers emerged as a new class of electronic materials and challenged earlier technologies based on inorganic materials. The superiority of organic polymeric materials lies in their versatility and in the possibility of tailoring materials for a particualr end-use. Organic polymers offer several advantages over inorganic materials:1.They are lighweight, flexible, and tough.2.They can be obtained in the form of ultrathin films, fiber, and even liquid crystals.3.They can be easily transformed into the desired configuartion.4.Their physical properties can be controlled over a wide range by appropriate chemical modifications.5.Some of them are biocompatible and hence can be utilized in biological processes.

ISSN:1532-1797    

DOI:10.1080/15321799108021957

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

A thorough understanding of the structure physical/mechanical properties of the polymers has made possible the molecular design of macromolecules for specific application needs. Several methods exist for polymer synthesis and processing. When it concerns homopolymers, each polymer structure is identified with a particular method for its realization. Depending upon the situation, one or more of the methods (polycondensation, cationic, anionic, or free radical technique) is sometimes resorted to. Each process has its own merits and demerits. The condensation method is applicable to only a few cases of condensation monomers. A variety of vinyl and cyclic monomers are polymerized by anionic and cationic processes. These processes have obvious disadvantages in the sense that they warrant rigorous polymerization conditions like the need for ultrapure monomers, absolute moisture/oxygen free atmosphere, and cryogenic temperatures which are often difficult to realize on an industrial scale. A recent trend in polymer preparation is therefore directed toward a free radical method. The method has the advantage that practically all vinyl monomers can be homo or copolymerized under relatively mild conditions. Further, there is often good control over the reaction parameters governing the kinetics of polymerization, and hence on the molecular characteristics of the resultant polymers.

ISSN:1532-1797    

DOI:10.1080/15321799108021958

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:1532-1797    

DOI:10.1080/15321799108021956

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor