Effect of heat treatment on the microstructural change of syndiotactic polystyrene/poly(styrene-co-vinyloxazolin)/clay nanocomposite

Park, Cheon Il; Kim, Mun Ho; Park, O Ok

doi:10.1016/j.polymer.2003.12.011

Cited by 20 publications

(9 citation statements)

References 20 publications

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“…Especially, the viscosity diverged at low shear rates for two nanocomposites with the high OMMT loading. We have previously observed the presence of pseudo‐solid‐like behavior for these concentrations near quiescent conditions, resulting from a percolated filler network and strong filler–filler interactions 22…”

Section: Resultsmentioning

confidence: 84%

Rheological and thermal properties of polylactide/organic montmorillonite nanocomposites

Wang

Wan

Zeng

2012

J of Applied Polymer Sci

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Polylactide/organic montmorillonite (PLA/OMMT) nanocomposites were prepared by melt‐compounding technique. Dynamic and steady rheological properties, as well as dynamic mechanical and thermal stability of the nanocomposites were evaluated using various characterization tools. It was found that the rheological behaviors of nanocomposites were related with both temperatures and OMMT loadings. At low OMMT loadings, the steady‐shear viscosities and the complex viscosities showed a Newtonian plateau in low frequency region or low shear rate region. At high OMMT loadings, strong shear‐thinning behaviors were observed in the full range of frequencies or shear rates. The complex viscosities and the storage modulus gradually decreased in the full frequency region with increasing temperature. The results demonstrated that rheology of PLA/OMMT nanocomposites was mainly sensitive to OMMT loadings. The relaxation time spectrum indicated that the relaxation of the PLA macromolecular chains was strongly confined by the layers of OMMT. The mechanical properties measured by dynamic mechanical analysis (DMA) and tensile test, and thermal stability of PLA/OMMT nanocomposites were improved at low OMMT loadings. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 84%

Rheological and thermal properties of polylactide/organic montmorillonite nanocomposites

Wang

Wan

Zeng

2012

J of Applied Polymer Sci

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“…However, much research still needs to be carried out before proposals can be made as to what is required (i.e., materials and reaction conditions) to obtain a particular clay morphology in a final PCN. Several researchers have made various proposals for this; for example, the need for complete compatibility between the clay or modified clay and the monomer/polymer,9 copolymerization of the main monomer with polymerizable surfactants bound to the clay layers,8, 10–15 (this idea has resulted in many successful exfoliated PCNs being reported), use of hyperbranched polymers,16 and inter‐gallery initiation of polymerization,17–23 resulting in the promotion of inter‐gallery polymerization/crosslinking at the expense of bulk polymerization. Uncontrolled inter‐gallery polymerization was reported as early as 1965, by Dekking, who anchored an azo initiator (AIBA) onto clay layers, thus forming an initiator‐modified clay, which he subsequently used in the initiation of polystyrene (PS) and poly(methyl methacrylate), and yielded PCNs with polymer chains attached to the clay layers 17, 24.…”

Section: Introductionmentioning

confidence: 99%

Novel Cationic RAFT‐Mediated Polystyrene/Clay Nanocomposites: Synthesis, Characterization, and Thermal Stability

Samakande

Juodaityte

Sanderson

et al. 2008

Macro Materials & Eng

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Two novel cationic RAFT agents, PCDBAB and DCTBAB, were anchored onto MMT clay to yield RAFT‐MMT clays. The RAFT‐MMT clays were then dispersed in styrene where thermal self‐initiation polymerization of styrene to give rise to exfoliated PS/clay nanocomposites occurred. The RAFT agents anchored onto the clay layers successfully controlled the polymerization process resulting in controlled molecular masses and narrow polydispersity indices. The nanocomposites prepared showed enhanced thermal stability, which was a function of the clay loading, clay morphology, and slightly on molecular mass.magnified image

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“…The same observation of decreased interlayer gaps after a silylation reaction using the same silane agent, norbornenechlorosilane, was reported by Guino et al(2005) [24] on a layered silicate clay previously ion exchanged with an alkyl ammonium salt, dodecyltrimethylammonium chloride (C 12 TMACl). Magadiite, a layered silicate clay like MMT, is capable of incorporating guest species in the interlayer space due to the exchangeable cations located between its galleries [37][38]. Unlike MMT, however, there are reactive silanol groups on the interlayer surface which can be modified [11,39].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Silylated functionalized montmorillonite clay for nanocomposite preparation

Penaloza¹,

Seery²

2018

Epitoanyag - JSBCM

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Hydrothermal silylation reaction between a norbornenyl-bearing chlorosilane coupling agent and the silanol groups of the montmorillonite (MMT) clay results in a functionalized organoclay. To do this, the clay samples were previously modified using different alkyl ammonium surfactants prior to silylation. Apparently, the different surfactant modifiers used led to different clay morphologies for the silylated functionalized clay templates as confirmed by x-ray diffraction and elemental micro-analysis.

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Effect of heat treatment on the microstructural change of syndiotactic polystyrene/poly(styrene-co-vinyloxazolin)/clay nanocomposite

Cited by 20 publications

References 20 publications

Rheological and thermal properties of polylactide/organic montmorillonite nanocomposites

Rheological and thermal properties of polylactide/organic montmorillonite nanocomposites

Novel Cationic RAFT‐Mediated Polystyrene/Clay Nanocomposites: Synthesis, Characterization, and Thermal Stability

Silylated functionalized montmorillonite clay for nanocomposite preparation

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