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Relevant academic research and scientific papers

Liquid crystal tetramers

The first homologous series of liquid crystal tetramers in which four mesogenic groups are linked via three alkyl spacers has been synthesised and characterised. The length of the outer two spacers is varied from 3 to 12 methylene units while the central

The effect of even-odd methylene spacer groups on the thermal stability of epoxy-amine polymers

A series of some novel epoxy-amine polymers was successfully synthesized by using DGEBA and aromatic diamines as starting materials. The cured free standing flexible polymer films were characterized by FTIR, DSC, TGA, and WAXD. The values of Tg

Thermo-mechanical and surface properties of POSS reinforced structurally different diamine cured epoxy nanocomposites

In the present study three structurally different diamines namely bisphenol-A based ether diamine, octane diol based ether diamine, and capron based diamine were synthesized and characterized using FT-IR, 1H-NMR and 13C-NMR spectra. These diamines were used to cure DGEBA epoxy resin and were reinforced with NH2-POSS in different weight percentages (1%, 3% and 5% wt) to obtain epoxy matrices and composites. Data obtained from thermo-mechanical, dielectric and surface studies were compared with those of neat epoxy matrix cured with diamino diphenyl methane (DDM). The surface morphology was ascertained from the XRD and SEM analysis and the presence of POSS in the composites was ascertained from the TEM images. The capron based diamine cured epoxy matrix shows better improvement in tensile strength and impact strength of 39.8% and 137.0% respectively than those of neat epoxy cured with diamino diphenyl methane (DDM). The value of contact angle (91.3°) of the capron based diamine cured epoxy composites infers that the epoxy matrix becomes hydrophobic nature. Data obtained from different studies suggest that the capron diamine cured epoxy matrix can be used in the form of a coating, encapsulant, or a sealant for different industrial and engineering applications for better performance and improved longevity. This journal is

MESOGENIC POLYMERS. 6. TWO SERIES OF ISOMERIC POLYAZOMETHINES.

Two homologoous series of alternating rigid-flexible, main chain liquid crystalline polyimines are reported; one based on terephthaldehyde the other based on p-phenylenediamine. It was found through examination of optical microscopic, x-ray diffraction an

Poly(6-oxy-2,2,4-trialkyl-1,2-dihydroquinoline)alkylene compounds as antidegradants for rubber

Vulcanizable or vulcanized diene elastomers containing stabilizing amounts of certain poly(6-oxy-2,2,4-trialkyl-1,2-dihydroquinoline)alkylene antidegradants show resistance to ozone attack. The antidegradants themselves are novel compounds.