Investigation of the mesomorphic structure of p-alkoxy-phenyl-p-acryloyloxy benzoate polymers

Hardy, G.; Cser, F.; Nyitrai, K.; Samay, G.; Kalló, A.

doi:10.1016/0022-0248(80)90209-2

Cited by 21 publications

(2 citation statements)

References 41 publications

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“…Thus, a characteristic "mosaic" morphology was revealed in thin polymer films with the dimensions of microregions on the microphotographs were in agreement with value determined from SAXS data [II,961. In the study of block samples of smectic polymers by a scanning electron microscope [55,88,92] a well pronounced lamellar morphology with supermolecular formations measuring several microns was found. Thus, a characteristic "mosaic" morphology was revealed in thin polymer films with the dimensions of microregions on the microphotographs were in agreement with value determined from SAXS data [II,961. In the study of block samples of smectic polymers by a scanning electron microscope [55,88,92] a well pronounced lamellar morphology with supermolecular formations measuring several microns was found.…”

Section: Smectic Polymersmentioning

confidence: 98%

“…The nature of thread-like defects in nematic polymers corresponds to such for classic low-molecular nematics [88, 891. In orienting nematic polymers in electric and magnetic fields, it is possible to obtain a "single-axis monocrystal" with high values of the orientation order parameters [59,901. Electron-microscopic photographs of nematic polymers in glassy state display thread-like formations over 50 to 100 nm long, reminiscent of characteristic defects in nematic textures [92]. Electron-microscopic photographs of nematic polymers in glassy state display thread-like formations over 50 to 100 nm long, reminiscent of characteristic defects in nematic textures [92].…”

Section: Nematic and Cholesteric Polymersmentioning

confidence: 99%

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Supermolecular organization in liquid crystalline polymers

Tsukruk¹,

Шилов²,

Lipatov³

1985

Acta Polymerica

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Features of supermolecular organization in liquid-crystalline polymers with mesogenic side groups and mesogenic groups in the main chains are described. The nematic and cholesteric mesophase in polymers are shown to be macroscopic ordered phases similar to low-molecular liquid crystals. Smectic polymers are microheterogeneous systems with complicated levels of supermolecular structures : layered packs and their aggregates. Ubermolekulare Strukturen in fliissig-kristallinen PolymerenDie Besonderheiten der iibermolekularen Strukturierung in fliissig-kristallinen Polymeren mit mesogenen Seitengruppen bzw. mesogenen Gruppen in der Hauptkette werden beschrieben. Es wird gezeigt, daB die nematischen und cholesterischen Mesophasen in den Polymeren makroskopisch geordnete Phasen sind, ahnlich wie in niedermolekularen fliissigen Kristallen. Smektische Polymere sind mikroheterogene Systeme mit komplizierten Ebenen der iibermolekularen Struktur, wie Schichtpakete und daraus aufgebaute Aggregate. Ha8aonemJnspnaa opzanuaayus e awu8nonpucmwuvecmx nonumpax PaCCMOTpeHbI OCO6eHHOCTH H~M O J I e K y J l H p H O B OpI'aHII3aqHH B XHnKOKpIICTaJIJIH4eCKHX IlOJIHMepaX C 6OKOBblMII Me3OreHHMMH I'pyIIIlaMH EI C MeaOreHHbIMH I'pyIIIIaMall B OCHOBHMX q e I I H X . r I O K a 3 a H 0 , 9 T O HeMaTHYeCKaJI II XOJIeCTepII-KpHCTaaJIaM. B TO Hce B p e M H , CMeKTHYeCKHe IlOJIHMepbI RBJIHIOTCH MHKpOreTepOreHHblMH Y e c K H e ~e w @ a 3~ B nommepax m m r n T c H M a K p o c K o n w e c K H y n o p H R o q e m m M H @ a s a~n ,

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Section: Smectic Polymersmentioning

confidence: 98%

Section: Nematic and Cholesteric Polymersmentioning

confidence: 99%

Supermolecular organization in liquid crystalline polymers

Tsukruk¹,

Шилов²,

Lipatov³

1985

Acta Polymerica

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The Effect of the Structural Elements on the Properties of Side Chain Mesomorphic Polymers

Cser¹,

Horvath²,

Nyitrai³

et al. 1985

Israel Journal of Chemistry

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The thermal properties of mesomorphic polymers depend on the relative amounts of the different structural elements (hard core, flexible chains, main chain) of the polymer. Literature data are compared with the conclusions obtained from the three‐component thermodynamic model of side chain mesomorphic polymers. The effects of the different soft elements (main chain, spacer and p‐alkyl or alkoxy chain) depend first of all on the length of the spacer and its interaction with the main chain. The thermal properties of the polymer can be well regulated by varying the different structural elements of the homo‐ and co‐polymers. The glass transition temperature (Tg) of the polymer can be reduced by building O and N atoms into the main chain and/or by binding the side chains on 3rd, 4th, etc. atoms of the main chain. The Tg can be further reduced by increasing the length of the spacer. If the spacers are long enough, the layer type structures are favored, with p‐alkoxy chains behaving also as a plasticizer of the main chain. The clearing point can be influenced by copolymerization of monomers with different hard cores. The three‐component thermodynamic model of side‐chain mesomorphic polymers well explains the effect of different structural elements on the structure and properties of these polymers.

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Mixing enthalpies of polymers with mesomorphic properties and mesogenic plasticizers

Cser¹,

Nyitrai²,

Hardy³

et al. 1981

J. polym. sci., C Polym. symp.

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SYNOPSISMixtures of polymers of mesomorphic properties with mesogenic plasticizers were investigated by differential scanning calorimetry (DSC). The natureof the mesomorphic structure of the polymers could be identified by studying the concentration dependence of such thermal processes as glass transition, mutual solution of the phases and formation of eutectic melts. Mixtures of polymers with a supposed nematic structure such as poly(pheny1-p-acryloyloxy-benzoate) (pPAB), poly(p-butoxy-phenyl-p-acryloyloxy-benzoate) (pBPAB), poly@-methoxy-phenyl-p-methacryloyloxyethoxy-benzoate) (pMPMEB), and one copolymer of p-methyl-p'-acryloyloxy-azoxy-benzene (MAAB) and cholesteryl-vinyl-succinate (CVS) and of nematogenic materials as terephthal-bisbutyl-aniline (TBBA), p-butoxy-phenyl-p-propionyloxy-benzoate (BPPB) and the monomers or the copolymer were investigated. None of the systems was found fully miscible with nematic structure. The enthalpies of melting at the clearing points were found proportional to the polymer content of the mixtures. The mixing enthalpies in the liquid state are too small to be measured by DSC. The mixing enthalpies of the solid components resulting in solid plasticized polymer are found proportional to the melting enthalpies of the plasticizers and to their saturation concentration in the polymer. The anisotropy of the bulk polymer originated from the anisometric geometrical shape of the macromolecules themselves, which is in good agreement with the structural concept introduced earlier.

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Investigation of the mesomorphic structure of p-alkoxy-phenyl-p-acryloyloxy benzoate polymers

Cited by 21 publications

References 41 publications

Supermolecular organization in liquid crystalline polymers

Supermolecular organization in liquid crystalline polymers

The Effect of the Structural Elements on the Properties of Side Chain Mesomorphic Polymers

Mixing enthalpies of polymers with mesomorphic properties and mesogenic plasticizers

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