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Showing 1 to 10 of 29 (0.054 seconds)Spelling suggestions: "subject:"iiquid crystalline folymers"" "subject:"iiquid crystalline colymers""
| 1 |
Thermal transitions in a random copolyester of 1,4 - hydroxybenzoic and 2,6 - hydroxynaphthoic acidsGolombok, Ruth January 1990 (has links)
No description available.
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| 2 |
Diffraction measurements of crystalline morphology in thermotropic random copolyestersWilson, David James January 1992 (has links)
No description available.
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| 3 |
Structure and properties of oriented thermotropic liquid crystalline polyesters and polyamidesZhang, Heping January 1992 (has links)
No description available.
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| 4 |
Synthesis and characterisation of novel poly(estersulphonate)s and poly(esteramide)sMcDonald, Lynn January 1994 (has links)
No description available.
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| 5 |
Plastic deformation and associated structural changes of some liquid crystalline aromatic copolyestersSalahshoor-Kordestani, Sorosh January 1991 (has links)
No description available.
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| 6 |
Self-association, compatibility, and strengthening behavior of liquid crystalline oligomersMoilanen, A. (Anu) 18 November 1998 (has links)
Abstract
Synthetic routes were developed for the preparation of 2-alkoxy-4-hydroxybenzoic
acids and 2-alkoxyhydroquinones, and a large-scale synthesis was
developed for the preparation of 2-thioalkoxyhydroquinones. The
2-alkoxy-4-hydroxybenzoic acids, which contained alkyl side chains of
different length, were used in the synthesis of new main chain liquid
crystalline (LC) homo-, random, and block co-oligomers. In addition,
oligomers of terephthaloyl chloride and 2-thioalkoxyhydroquinones
and oligomers of terephthaloyl chloride and 2-alkoxyhydroquinones
were produced.
All the oligomers were blended with aliphatic polyamide 11
(PA 11). The effect of alkyl side chain length on the compatibility
behavior of the LC oligomers towards the aliphatic polymer was characterized
by DSC and FTIR, and the effect of side chain length on the flexural
properties of the blends was investigated with a three-point bending
test.
The miscibility studies showed variable interfacial adhesion
between the blended compounds. The strongest adhesion was achieved
between PA 11 and the homo-oligomers of 2-alkoxy-4-hydroxybenzoic
acids with short or medium long substituents (C4-C10),
but the interactions between PA 11 and the oligomer with long aliphatic
side chain (C18) were poor, as were those
between PA 11 and the wholly aromatic oligomer of 4-hydroxybenzoic
acid. The compatibility between PA 11 and the co-oligomers of 2-alkoxy-4-hydroxybenzoic
acids was slightly lower than the compatibility of the corresponding
homo-oligomers. DSC and FTIR analyses of the blends of oligomers
of terephthaloyl chloride and 2-thioalkoxyhydroquinones and oligomers
of terephthaloyl chloride and 2-alkoxyhydroquinones with PA 11 implied
that the interactions between the blended compounds were poor.
FTIR spectra and viscosity measurements confirmed that all
the oligomeric structures could self-associate, with effect on the
final mechanical properties of the polyamide. The strength of PA
11 in a three-point bending test was increased by the addition of
only 1% of LC oligomers to the matrix. The results also
showed that the strengthening ability of the oligomers is directly
proportional to the total amount of aliphatic carbons. The best
strengthening results were obtained with unsubstituted oligomers,
random co-oligomers of 2-alkoxy-4-hydroxybenzoic acids, and homo-oligomer
of 2-butoxy-4-hydroxybenzoic acid.
DSC investigations of a ternary blend of the oligomer of 2-decanyloxy-4-hydroxybenzoic
acid, PA 11, and wholly aromatic commercial LC polymer showed the
promising compatibilizing effect of the oligomer.
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| 7 |
Crosslinked liquid crystalline polymers based on 4,4'-bis(n-(acryloyloxy)alkyloxy)biphenyl monomersQian, Xuejun January 1993 (has links)
No description available.
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| 8 |
Liquid crystalline polymers with complex architecturesKawasumi, Masaya January 1993 (has links)
No description available.
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| 9 |
Dielectric relaxations in side-chain liquid crystalline polymersZhong, Zhengzhong January 1993 (has links)
No description available.
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| 10 |
Synthesis, Characterization, and Rheology of Functional and Heterocyclic Liquid Crystalline PolymersHuang, Wenyi January 2006 (has links)
No description available.
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