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Abstract  

Vinylated polyhedral oligomeric silsesquioxane (POSS-M) was prepared by the reaction of POSS containing amine groups with acrylic acid. Azobenzene liquid crystalline copolymer (LCP-POSS) was then synthesized with 6.0 mol% POSS-M and 94.0 mol% acrylate monomer containing azobenzene liquid crystalline moiety (Azo-M) by free-radical copolymerization. Homopolymer of Azo-M (LCP) was also synthesized under the same conditions. Their thermal properties and liquid crystallinity were characterized by Thermal gravimetric analysis (TG), differential scanning calorimetry (DSC), Wide-angle X-ray diffraction experiments (XRD) and polarized optical micrographs (POM). The results showed that LCP-POSS has higher thermal stability and glass transition temperature than pure LCP due to the incorporation of the rigid cage-like POSS. Especially, LCP-POSS exhibits enantiotropic smectic and nematic liquid crystalline behaviors, its smectic-nematic transition temperature (T SN) and nematic-isotropic transition temperature (T NI) are higher than those of pure LCP, which may promote and extend its applications on stimuli-responsive materials and devices.

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(phenylsilsesquioxane) is the most investigated polymer of the silsesquioxane class because of its good thermal stability. The presence of organic groups renders the surface of the spheres more hydrophobic than that of inorganic spheres, thus offering the potential to

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Journal of Thermal Analysis and Calorimetry
Authors: Hieronim Maciejewski, Izabela Dąbek, Ryszard Fiedorow, Michał Dutkiewicz, and Mariusz Majchrzak

siloxanes having terminal hydroxy groups [ 21 – 24 ], not fully condensed silsesquioxanes, e.g. phenyltrisilanol POSS [ 25 ], siloxanes containing amino groups [ 26 – 30 ] as well as amino functional silsesquioxanes [ 31 ]. Another method of producing hybrid

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]. Other boron compounds (e.g., boric acid and borax) [ 6 , 7 ]; silanes; silicon-containing polymers: siloxanes, silsesquioxanes [ 6 ], and inorganic silicates, e.g., modified montmorillonites [ 8 – 10 ]; and halloysite nanotubes [ 11 , 12 ] were

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silsesquioxane-based hybrid urethane acrylate applied to UV-curable flame-retardant coatings . Prog Org Coat 2008 65 : 1 – 9 10.1016/j.porgcoat.2008.08.018 . 8. Gaan , S , Rupper , P , Salimova

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, L , Díez , J , García-Garabal , S , Montero , B . Organic/inorganic hybrid materials from an epoxy resin cured by an amine silsesquioxane . J Therm Anal Calorim . 2007 ; 87 : 1 69 – 72 . 10.1007/s10973

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, Abate L , Bottino FA , Bottino P , Chiacchio MA . Thermal degradation of differently substituted cyclopentyl polyhedral oligomeric silsesquioxane (CP-POSS) nanoparticles . J Therm Anal Calorim . 2011 . 10.1007/s10973

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-containing polyhedral oligomeric silsesquioxane (DOPO-POSS) in polycarbonate/acrylonitrile-butadiene-styrene blends . Polym Adv Technol. 2011 . doi: 10.1002/pat.1929 . 5. Konig , A , Kroke , E 2011

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network resulted in high gas permeability, which was a response for its low flame-retardant efficiency. However, another previous work in our lab showed SWCNT buckypapers also had dramatically improvement in polyhedral oligomeric silsesquioxane (POSS

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oligomeric silsesquioxane (POSS) . Macromolecules 2003 36 : 3128 – 3135 10.1021/ma021539f . 9. Mecado , LA , Reina , JA , Galià , M . Flame retardant epoxy resins based on

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