Phase behavior of blends of poly(ethylene terephthalate) with liquid-crystalline polymers

1998 ◽  
Vol 38 (9) ◽  
pp. 1572-1586 ◽  
Author(s):  
Pierluigi Magagnini ◽  
Maria S. Tonti ◽  
Marco Masseti ◽  
Massimo Paci ◽  
Lilia I. Minkova ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Liquid Crystalline ◽  
Ethylene Terephthalate ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Magnetic Orientation of Polymers A Novel Technique of Controlling Birefringence

1999 ◽  
Vol 598 ◽  
Author(s):  
Tsunehisa Kimura ◽  
Eiko Ito
Keyword(s):  
Magnetic Field ◽  
Liquid Crystalline ◽  
Ethylene Terephthalate ◽  
Ordered Structure ◽  
Magnetic Orientation ◽  
Crystalline Polymers ◽  
Novel Technique ◽  
Poly Ethylene Terephthalate ◽  
New Finding ◽  
Poly Ethylene

ABSTRACTMagnetic -field induced orientation of crystalline polymers recently reported by our group is briefly summarized and a possible application of this new phenomenon is presented. We have recently reported a new finding that crystalline polymers including poly(ethylene-2,6-naphthalate), isotactic polystyrene, isotactic polypropylene, poly(ethylene terephthalate), and paraffin align under a strong magnetic field during the phase transition from melt to crystal. We have assumed that some ordered structure, most likely liquid-crystalline-like structure, appearing transiently during the transition is responsible for this phenomenon. Aligned films were transparent and exhibited retardation of several hundred nanometers, suggesting a possible application to fabrication of materials demanded for optical use.

Nanocomposites of Liquid Crystalline Polyhedral Oligomeric Silsesquioxane Particles and Liquid Crystalline Polymers

2003 ◽  
Vol 788 ◽  
Author(s):  
Alline P. Somlai ◽  
Subramanian Iyer ◽  
David A. Schiraldi
Keyword(s):  
High Performance ◽  
Liquid Crystalline ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Liquid Crystalline Polymers ◽  
Crystalline Polymers ◽  
Liquid Crystalline Phases ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Oligomeric Silsesquioxane ◽  
Potential Use

ABSTRACTA new liquid crystalline nanoparticle has been synthesized by the reaction of a cyanobiphenyl derivative with polyhedral oligomeric silsesquioxane (POSS®*). Two POSS nanoparticles, liquid crystalline POSS (LC POSS 3) and a non-LC isooctyl POSS (OPOSS), were then compounded at 2.5 wt % into thermotropic polyester liquid crystalline polymers (LCPs) poly(hexamethylene 4,4'-bibenzoate), poly(diethylene glycol 4,4'-bibenzoate) as well as a frustrated LCP 45:55 poly(ethylene terephthalate-co-4,4'-bibenzoate). These polymers are currently being studied for potential use in high performance fibers and high barrier packaging materials. A comprehensive study of LCP/LC POSS 3 nanocomposites will focus on any changes in the thermal and mechanical properties of the LCPs with increasing LC POSS 3 concentration. It will be determined how incorporation of LC POSS 3 affects the liquid crystalline phases of an amorphous and crystalline LCP. Of special interest is the incorporation of LC POSS 3 into a frustrated LCP. It is proposed that the LC POSS 3 might help to unfrustrate the LCP.

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