Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Industrially applicable methods of poly(methyl methacrylate)/organophilic montmorillonite nanocomposites preparation: Processes and cast materials characterization
Abstract The poly(methyl methacrylate) (PMMA)/organophilic montmorillonite cast nanocomposites were prepared via bulk free-radical polymerization of raw monomer (MMA) and PMMA/MMA syrup. Three types of commercial organophilic montmorillonites (o-Mt) (swelled in either MMA or syrup and additionally homogenized in a high-speed flow homogenizer or twin-screw extruder, respectively) have been utilized to PMMA panels manufacturing. An influence of o-Mt type and content as well as its dispersion methodology on mechanical, thermal and optical properties has been investigated. Although PMMA panels containing o-Mt exhibited similar tensile strength (in respect to unmodified PMMA samples), higher hardness (+2 HBa units) and flexural strength (+15% for PMMA prepared using raw monomer and unhomogenized o-Mt/MMA paste) have been observed. Moreover, introduction of o-Mt into polymeric matrix resulted in increased thermal stability, Vicat softening temperature (+5°C) and glass transition temperature value determined by DMTA technique (+5°C for PMMA/o-Mt composites prepared from syrup with non-extruded clay mineral paste). XRD and TEM analysis showed full or partial exfoliation of organophilic montmorillonites in polymer matrix, respectively.
Highlights Commercial organophilic montmorillonites as nanofillers of cast PMMA panels Cast PMMA panels prepared via polymerization of raw monomer and PMMA/monomer syrup. Organophilic montmorillonites improve mechanical and thermal properties of PMMA. Low content of organophilic montmorillonite in PMMA (<0.05wt.%) is preferred.
Industrially applicable methods of poly(methyl methacrylate)/organophilic montmorillonite nanocomposites preparation: Processes and cast materials characterization
Abstract The poly(methyl methacrylate) (PMMA)/organophilic montmorillonite cast nanocomposites were prepared via bulk free-radical polymerization of raw monomer (MMA) and PMMA/MMA syrup. Three types of commercial organophilic montmorillonites (o-Mt) (swelled in either MMA or syrup and additionally homogenized in a high-speed flow homogenizer or twin-screw extruder, respectively) have been utilized to PMMA panels manufacturing. An influence of o-Mt type and content as well as its dispersion methodology on mechanical, thermal and optical properties has been investigated. Although PMMA panels containing o-Mt exhibited similar tensile strength (in respect to unmodified PMMA samples), higher hardness (+2 HBa units) and flexural strength (+15% for PMMA prepared using raw monomer and unhomogenized o-Mt/MMA paste) have been observed. Moreover, introduction of o-Mt into polymeric matrix resulted in increased thermal stability, Vicat softening temperature (+5°C) and glass transition temperature value determined by DMTA technique (+5°C for PMMA/o-Mt composites prepared from syrup with non-extruded clay mineral paste). XRD and TEM analysis showed full or partial exfoliation of organophilic montmorillonites in polymer matrix, respectively.
Highlights Commercial organophilic montmorillonites as nanofillers of cast PMMA panels Cast PMMA panels prepared via polymerization of raw monomer and PMMA/monomer syrup. Organophilic montmorillonites improve mechanical and thermal properties of PMMA. Low content of organophilic montmorillonite in PMMA (<0.05wt.%) is preferred.
Industrially applicable methods of poly(methyl methacrylate)/organophilic montmorillonite nanocomposites preparation: Processes and cast materials characterization
Kowalczyk, Krzysztof (Autor:in) / Spychaj, Tadeusz (Autor:in) / Ubowska, Agnieszka (Autor:in) / Schmidt, Beata (Autor:in)
Applied Clay Science ; 97-98 ; 96-103
09.05.2014
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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