ISSN:0935-9648    

DOI:10.1002/adma.19920040302

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040303

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040304

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

摘要:

AbstractNonlinear optical (NLO) materials provide the basis for an array of active optical devices under development throughout several high technology industries. Applications would include communications, data storage, and computing. Active optical devices can be used to alter light in order to encode or direct information in a number of ways. While the applications of optical technology such as fiber optics, optical storage and optical displays have identified a need for such devices, material properties have so far limited their introduction. Intensive, world‐wide, development of specifically designed polymers appears to offer the most attractive solutio

ISSN:0935-9648    

DOI:10.1002/adma.19920040305

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040306

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040307

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040308

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

ISSN:0935-9648    

DOI:10.1002/adma.19920040309

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

摘要:

AbstractPolymer blends of two components, in general, are not miscible. However, according to Karasz‐MacKnight theory, intramolecular repulsion may outweigh intermolecular repulsion and cause two polymers to have a net interaction. Using a simple short chain molecular model incorporating both interand intramolecular interactions, estimates of net interaction energies for a series of polymeric imides, benzimidazoles and related high‐performance polymers can be calculated and used to predict miscibility in excellent agreement with experimental results, thus providing a useful confirmation of theory and a focus for the direction of further experimental w

ISSN:0935-9648    

DOI:10.1002/adma.19920040310

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY

摘要:

AbstractThermotropic liquid‐crystal polymers for high‐performance applications are typically based on wholly aromatic polyester and polyamide architectures. The linear character of the aromtic monomers produces polymer chains with stiff, extended conformations. As a result, the chains organize themselves into a nematic melt and readily orient in response to processing flow fields. The close coupling between chain orientation and flow fields produces both a rich variety of materials and a high degree of controllability of their structure and properties (such as the tensile strength, elastic modulus and coefficient of thermal expansion). In this paper, we describe synthetic efforts to develop liquid‐crystal polymer structures and the relationships between chain molecular structure, processing, and properties of this class of polymers in two distinct processing situations: Injection molding and fiber formation. The special importance of the orientational flow field in developing high orientation and excellent mechanical properties will be highli

ISSN:0935-9648    

DOI:10.1002/adma.19920040311

出版商:WILEY‐VCH Verlag GmbH    

年代:1992

数据来源: WILEY