Elongational Viscotiy of Polymer Composite Including Hydrophilic or Hydrophobic Silica Nano-Particles

Kakuda, Masaki; Takahashi, Tatsuhiro; Koyama, Kiyohito

doi:10.1678/rheology.34.181

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…An example how the strain hardening of a polymer melt may be influenced by special surface characteristics of SiO 2 is given in the following. Kakuda et al (2006) studied the elongational behavior of a poly (methylmethacrylate) filled with 5 wt. % hydrophobic or hydrophilic SiO 2 particles with a mean diameter of 16 nm at elongational rates between 0.01 and 0.5 s -1 .…”

Section: Sio 2 Particlesmentioning

confidence: 99%

Melt strain hardening of polymeric systems filled with solid particles: review and supplementary experimental results

Münstedt

2024

Rheol Acta

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Melt strain hardening is an interesting characteristic property of the elongational flow of polymers. While strain hardening of many unmodified polymer melts has been widely discussed, a comprehensive presentation of the influence of particles on this property is missing. Using literature data and own measurements, the effects of solid particles of various geometries are compared. Micro-sized particles generally reduce melt strain hardening and may even lead to strain thinning. This behavior is postulated to be due to shear flow components around the particles and resulting shear thinning of the polymer matrices that reduces the resistance to flow. More complex is the influence of nano-sized fillers and layered silicate nanoparticles, in particular. Weakly exfoliated particles show effects similar to micro-fillers, but for strongly exfoliated silicates distinct strain hardening is observed that increases with decreasing elongational rate. This behavior is particularly pronounced for polymers modified with maleic anhydrides and thought to be related to electrostatic forces between exfoliated platelets of the silicates and polymer molecules hindering molecular motions.

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Section: Sio 2 Particlesmentioning

confidence: 99%

Melt strain hardening of polymeric systems filled with solid particles: review and supplementary experimental results

Münstedt

2024

Rheol Acta

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“…The elongational flow behavior of polydisperse linear PMMA in melt was investigated by several authors and was reported to show only limited strain hardening (Linster and Meissner 1989;Takahashi et al 1999a, b;Kakuda et al 2006). If a small amount of a very high molecular weight polymer was added, the strain-hardening effect was significantly enhanced, and this tendency increased with increasing content of the high molecular weight component (Ogura and Takahashi 2000;Takahashi et al 1999b).…”

Section: Introductionmentioning

confidence: 99%

Uniaxial extensional flow behavior of comb-shaped poly(methyl methacrylate)

et al. 2015

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Comb-shaped poly(methyl methacrylate)s (PMMAs) with various mass fractions and various molecular weights of the side chains were prepared by free-radical polymerization followed by atom transfer radical polymerization (ATRP). The rheological properties were characterized in linear-viscoelasticity and in uniaxial extensional flow. Due to branching and thereby slow relaxation of the backbone, significant strain hardening was observed and well analyzed by the molecular stress function (MSF) model. The model parameter f max 2 increased with increasing M n,bb at almost constant M n,br and p, and with increasing p at almost constant Φ n,br , where M n,bb and M n,br are the number-average molecular weights of the backbone and the branched chains, and p and Φ n,br are the average number per backbone and the number-average mass fraction of the branched chains, respectively. These results provide guidelines for the polymer design with the aim of enhancing strain hardening in elongational flow.

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