Relationship between structure and rheological properties in the melt of polymers containing spherical inclusions

Bardollet, P.; Bousmina, Mosto; Müller, René

doi:10.1002/pat.1995.220060508

Cited by 16 publications

(8 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This behaviour could be ascribed to a percolation phenomenon produced by the fact of having an incompatible polymer blend, which was previously observed through TEM characterization (Fig. 1) [47,48]. An increase in the MAM molecular weight led to an increase of the micelle density (see Table 2) and hence, to a stronger interaction between the micelles, as they are closer.…”

Section: Rheological Behavioursupporting

confidence: 60%

Understanding the role of MAM molecular weight in the production of PMMA/MAM nanocellular polymers

Bernardo

León

Laguna‐Gutiérrez

et al. 2018

Polymer

View full text Add to dashboard Cite

Nanostructured polymer blends with CO2-philic domains can be used to produce nanocellular materials with controlled nucleation. It is well known that this nanostructuration can be induced by the addition of a block copolymer poly(methyl methacrylate)-poly(butyl acrylate)-poly(methyl methacrylate) (MAM) to a poly(methyl methacrylate) (PMMA) matrix. However, the effect of the block copolymer molecular weight on the production of nanocellular materials is still unknown. In this work, this effect is analysed by using three types of MAM triblock copolymers with different molecular weights, and a fixed blend ratio of 90 wt% PMMA and 10 wt% of MAM. Blends were produced by extrusion. As a result of the extrusion process, a non-equilibrium nanostructuration takes place in the blends, and the micelle density increases as MAM molecular weight increases. Micelle formation is proposed to occur as result of two mechanisms: dispersion, controlled by the extrusion parameters and the relative viscosities of the polymers, and self-assembly of MAM molecules in the dispersed domains. On the other hand, in the nanocellular materials produced with these blends, cell size decreases from 200 to 120 nm as MAM molecular weight increases. Cell growth is suggested to be controlled by the intermicelle distance and limited by the cell wall thickness. Furthermore, a theoretical explanation of the mechanisms underlying the limited expansion of PMMA/MAM systems is proposed and discussed.

show abstract

Section: Rheological Behavioursupporting

confidence: 60%

Understanding the role of MAM molecular weight in the production of PMMA/MAM nanocellular polymers

Bernardo

León

Laguna‐Gutiérrez

et al. 2018

Polymer

View full text Add to dashboard Cite

show abstract

“…Similar curves are frequently observed in suspension rheology and indicate that a v independent plateau may exist at very low frequencies. [16][17][18] This tendency to form a lowfrequency plateau in G 0 is not observed for the PA70 blend. Figure 3 presents the transient elongational viscosity m (t) which is defined by…”

Section: Linear Viscoelastic Shear Oscillationscontrasting

confidence: 47%

Influence of Reactive Compatibilization on the Melt Flow Properties and Morphology of Polyamide 6/Styrene‐Acrylonitrile Blends

Sailer

Handge

2007

Macromolecular Symposia

View full text Add to dashboard Cite

Summary: In this study, we investigate the influence of reactive compatibilization on the rheological properties of polyamide 6/styrene-acrylonitrile (PA 6/SAN) blends in the melt. Linear viscoelastic shear oscillations, simple elongation to a large stretch ratio and subsequent recovery experiments were performed. The morphology of the blends was examined by atomic force microscopy. We prepared three PA 6/SAN blends with different composition ratios of PA 6 and SAN (70/30, 50/50, 30/70) and a constant concentration of the reactive agent. Our experiments revealed that reactive compatibilization significantly increases the complex modulus of PA 6/SAN blends at low frequencies. In particular, the data of the PA 6/SAN 50/50 blend and the PA 6/SAN 30/70 blend indicated that an elastic network between neighbouring PA 6 domains was formed. In simple elongation, the transient elongational viscosity of the blends exceeded the values of the single components. In recovery, the recovered stretch of all blends was larger than the recovered stretch of the pure components. The differences of the blend morphology and of the linear viscoelastic behaviour were qualitatively explained by the asymmetric properties of the reactively compatibilized interface.

show abstract

“…Considering the morphology and linear viscoelastic properties, the growth of stress overshoot amplitude could be attributed to greater resistant of the three‐dimensional network structure of cured rubber particles. The rubber particle structures undergo alignment and/or breakdown under the applied flow . Tendency of the rubber domains for orientation under shear increases with rubber content and size of the domains.…”

Section: Resultsmentioning

confidence: 99%

“…Rubber content (wt%) The rubber particle structures undergo alignment and/or breakdown under the applied flow. [56,59] Tendency of the rubber domains for orientation under shear increases with rubber content and size of the domains. It also enhances the thixotropy, nonlinear behavior, and sensitivity of the microstructures to the applied strain in the TPVs samples, which is in agreement with the amplitude sweep results.…”

Section: Energy-dependent Kinetic Equationmentioning

confidence: 99%

The effect of aggregation of cured rubber particles on rheology of thermoplastic vulcanizates

et al. 2020

View full text Add to dashboard Cite

In this work, we study the effect of microstructure of rubber particle aggregates on linear and nonlinear viscoelastic properties of olefinic thermoplastic vulcanizates (TPVs) based on ethylene‐propylene‐diene rubber (EPDM) and polypropylene (PP). TPVs samples with identical rubber content and different extent of rubber particle aggregation are prepared through dynamic vulcanization of PP/EPDM blends (conventional method) with different compositions as well as dilution of PP/EPDM 40/60 TPVs. Morphological observations show larger aggregates of cured rubber particles in the diluted samples (D) compared to the ones prepared by conventional method (B). The difference between the microstructures of the two series of samples decreases with increasing rubber content. Linear viscoelastic measurements demonstrate higher elastic modulus and dynamic viscosity at low frequency for D samples compared to B ones, representing the effect of aggregation of the dispersed rubber phase. The higher extent of aggregation in D samples also leads to a lower percolation threshold and smaller linear viscoelastic region. From fitting of a structure‐dependent model on the stress growth results, longer characteristic relaxation times are obtained for D samples due to the presence of rubber aggregates. Additionally, A higher degree of orientation and less contribution of rubber aggregate destruction are found under shear flow in D samples.

show abstract

Relationship between structure and rheological properties in the melt of polymers containing spherical inclusions

Cited by 16 publications

References 11 publications

Understanding the role of MAM molecular weight in the production of PMMA/MAM nanocellular polymers

Understanding the role of MAM molecular weight in the production of PMMA/MAM nanocellular polymers

Influence of Reactive Compatibilization on the Melt Flow Properties and Morphology of Polyamide 6/Styrene‐Acrylonitrile Blends

The effect of aggregation of cured rubber particles on rheology of thermoplastic vulcanizates

Contact Info

Product

Resources

About