Silica retards radial growth of spherulites in isotactic polystyrene

Kennedy, M. A.; Turturro, Giulio; Brown, G. R.; St-Pierre, L. E.

doi:10.1038/287316a0

Cited by 16 publications

(12 citation statements)

References 7 publications

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“…However, the existence of the heterogeneous fillers may hinder the transport of macromolecular chains to the crystallization zone, especially when the polymer–filler interaction is improved by interfacial modification. In silica‐filled isotactic polystyrene and isotactic poly(propylene oxide) composites, St‐Pierre and coworkers13–17 reported that, besides the nucleation ability for these polymers, silica remarkably retarded the growth of spherulites, even if the amount of silica in the composites is as little as 0.1 vol% 16. Similarly, we observed18 that the incorporation of the BaSO 4 into the PP caused a decrease in spherulite growth rate, and the effect is more remarkable when the PP–BaSO 4 interface was enhanced.…”

Section: Resultssupporting

confidence: 78%

“…Similarly, we observed18 that the incorporation of the BaSO 4 into the PP caused a decrease in spherulite growth rate, and the effect is more remarkable when the PP–BaSO 4 interface was enhanced. The phenomena were attributed to the adsorption of macromolecules onto the filler surface,14–16, 18 which results in an increase of the melt viscosity and thus influences the transport of crystallizable polymer segments to the crystal face.…”

Section: Resultsmentioning

confidence: 99%

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Crystallization and melting behaviour of polypropylene/barium sulfate composites

Wang¹,

Wu²,

Zeng³

2004

Polymer International

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The effects of polypropylene (PP)–barium sulfate (BaSO4) interfacial interaction on the crystallization and melting behaviour of PP/BaSO4 composites were investigated by means of differential scanning calorimetry. The results show that BaSO4 can act as nucleating agent and the nucleation activity increases when the PP–BaSO4 interface is modified. Neat PP exhibits a single fusion endotherm after being non‐isothermally crystallized, whereas the PP/BaSO4 composites show dual endotherms or a broad endotherm with a shoulder at the low temperature side, indicating that there are more crystallites with less perfection formed in the composite samples. It is shown that the hindrance of BaSO4 particles on the transport of PP chains to the crystallization zone is responsible for the formation of the less perfect crystallites. Moreover, the melting patterns of the composites are different from sample to sample, which can be attributed to the different extents of deviation from equilibrium at which the crystallization processes proceeded. Copyright © 2004 Society of Chemical Industry

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Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Crystallization and melting behaviour of polypropylene/barium sulfate composites

Wang¹,

Wu²,

Zeng³

2004

Polymer International

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“…(a)). The reduction in the linear growth rate can be explained by the spatial constraints on crystallizing units introduced by confining them to the restricted space between SiO 2 NPs . As a result, the reduction in growth rate is attributed to a reduction in mobility or a marked increase in the activation energy of the precursor units restricted or confined by the SiO 2 NPs.…”

Section: Resultsmentioning

confidence: 99%

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Lee

Hong

Ungar

et al. 2012

Polymer International

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The crystallization of poly(ethylene oxide) (PEO) in the presence of silica nanoparticles (SiO2 NPs) was investigated in terms of heterogeneous nucleation of SiO2 NPs using polarizing optical microscopy and differential scanning calorimetry. The content and surface functionality of SiO2 NPs were considered as the main factors affecting crystallization, and the effect of annealing time and temperature was also examined. The SiO2 NPs acted as heterogeneous nucleates during the crystallization process, thereby enhancing the nucleation density and limiting the spherulitic growth rate. A kinetics study of non‐isothermal crystallization showed that the crystallization rate of 5 wt% SiO2/PEO nanocomposite was ca 2.1 times higher than that of neat PEO. In addition, among various surface‐functionalized SiO2 nanoparticles, alkyl‐chain‐functionalized SiO2 NPs were favorable for achieving a higher crystallization rate due to the enhanced compatibility between the SiO2 NPs and PEO chains. © 2012 Society of Chemical Industry

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“…In three dimensional fillers, Kennedy et al studied the crystallization of poly(propylene oxide) and isotactic polystyrene with the addition of silica particles 7. At low particle loadings, the fillers acted as a nucleation agent, thus greatly enhancing the overall crystallization rate but also significantly reducing the spherulite growth rate.…”

Section: Introductionmentioning

confidence: 99%

Isothermal crystallization of polyethylene oxide/silver nanoplate composites

Rahmansyah

Syu

et al. 2011

J of Applied Polymer Sci

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This research was accomplished to investigate the kinetics of isothermal crystallization of polyethylene oxide (PEO)/silver nanoplate composites. It was obtained that the spherulites increased in size and numbers with time for the composites with various particle loadings. Additionally, the spherulite growth rate of composites decreased with an increase in the crystallization temperature and increased with the addition of nanoplates. The spherulite growth rate was further analyzed by the theory developed by Lauritzen and Hoffman. The product of the lateral surface free energy (r) and the end surface free energy (r e ) decreased with an increase in the content of nanoplates. We proposed the possible crystallization mechanisms of these PEO/nanoplate composites according to the change of r and r e with the presence of nanoplates. A controlled experiment showed a minor change in PEO crystallization with the presence of a surfactant C 16 TAB. This implied that the unique size and shape of nanoplates plays a key role on hindering the primary nucleation of PEO and increasing the spherulite growth rate.

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Silica retards radial growth of spherulites in isotactic polystyrene

Cited by 16 publications

References 7 publications

Crystallization and melting behaviour of polypropylene/barium sulfate composites

Crystallization and melting behaviour of polypropylene/barium sulfate composites

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles

Isothermal crystallization of polyethylene oxide/silver nanoplate composites

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Silica retards radial growth of spherulites in isotactic polystyrene

Cited by 16 publications

References 7 publications

Crystallization and melting behaviour of polypropylene/barium sulfate composites

Crystallization and melting behaviour of polypropylene/barium sulfate composites

Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO2 nanoparticles

Isothermal crystallization of polyethylene oxide/silver nanoplate composites

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Product

Resources

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Crystallization of poly(ethylene oxide) embedded with surface‐modified SiO₂ nanoparticles