Thermotropic polymers polymer blends

D. Aciemo and M. R. Nobile, Thermotropic Liquid Crystal Polymer Blends, (F. P. La Mantia, ed.), Technomic Publishing, Lancaster (1993). 

Polymer Blends Containing Thermotropic Liquid Crystalline Polymer... 

Recent developments in the substitution of completely aromatic LC polyesters have produced polymers which show improved solubilities and reduced transition temperatures (29). The presence of these side groups provides a method for producing polymers that are compatible with other similarly modified polymers. In this way, blends of rigid and flexible polymers can be prepared. Substituents have included alkyl, alkoxy (30) and phenyl alkyl groups (21), some of which lead to mesophases that have been reported as being "sanidic" or board-like. This approach has been used with both polyesters and polyamides and has lead to lyotropic and thermotropic polymers depending on the particular composition used. Some compositions even show die ability to form both lyotropic and thermotropic mesophases (22). 

Originally. TOA was devised and used for analyses of chain mobility in polymers (7) and polymer blends (8.91 by monitoring birefringence disappearance during programmed heating in scratches scribed on film surfaces. Lenz (10.Ill has reported the use of TOA in the study of liquid crystal polymers, and recently we have used the technique in determining melt- and isotropization temperatures for thermotropic fully aromatic liquid crystal polymers (4.51. 

P. Magagnini in Thermotropic Liquid Crystal Polymer Blends (Ed. F. P. la Mantia), Technom-ic, Basel 1993, p. 1. 

G. Kiss. In situ composites Blends of isotropic polymers and thermotropic liquid crystalline polymers. Polym. Eng. ScL, 27 410-423, 1987. 

E. Shivakumar, C. Das, E. Segal, and M. Narkis. Viscoelastic properties of ternary in situ elastomer composites based on fluorocarbon, acrylic elastomers and thermotropic liqnid crystalline polymer blends. Polymer, 46( 10) 3363-3371, April 2005. 

S. Saengsuwan, G. R. Mitchell, and S. Bualek-Limcharoen. Determination of orientation parameters in drawn films of thermotropic liquid crystalline polymer/polypropylene blends using WAXS. Polymer, 44 5951-5959, 2003. 

Gopakumar, T. G., Ronrathnam, S., Lele, A., Rajan, C. R., and Fradet, A. 1999. In situ compatibilisation of poly(phenylene sulphide)/wholly aromatic thermotropic liquid crystalline polymer blends by reactive extrusion Morphology, thermal and mechanical properties. Polymer 357-364. 

Kiss G. In situ composites blends of isotropic polymers and thermotropic Uquid crystalline polymers. Polym Eng Sci 1987 27 410-23. 

This chapter deals exclusively with thermotropics (pure polymer systems). This review deals with longitudinal one-comb and network PLCs and blends of longitudinal PLCs and conventional flexible chain polymers (Figure 10.2). An excellent introduction to the subject including a presentation of definitions and classifications is given by Brostow [10]. It is important to emphasize that a given PLC at a given... 

Because most commercially available thermotropic liquid crystalline polymers have been used in the form of composites, we have also incorporated a chapter on polymer blends, detailing blending mechanisms and resultant... 

K. G. Blizard and R. R. Haghighat, Processing and properties of polyimide melt blends containing a thermotropic liquid crystalline polymer, Polym. Engr. and Sci., vol. 33, No. 2, 1-9. 

Rheology of Blends of Thermotropic Polymers and Engineering Thermoplastic. 

In many cases the observed reduction in the viscosity of the blend is more dramatic than the evaluated value, indicating therefore the high effectiveness of thermotropic polymers used as processing aid in the manufacture of composites. 

The dynamic properties, temperature transitions and thermal stability of PEEK-thermotropic liquid crystalline polymer blends. Pdlym. Eng. Sd., 31, 963. 

La Mantia, L. P., ed., "Thermotropic Liquid Crystal Polymer Blends", Technomic, Lancaster, 1993. 

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