The effects of reprocessing cycles on the structure and properties of polystyrene/Cloisite15A nanocomposites

Remili, Cherifa; Kaci, Mustapha; Benhamida, Aida; Bruzaud, Stéphane; Grohens, Yves

doi:10.1016/j.polymdegradstab.2011.05.005

Cited by 53 publications

(42 citation statements)

References 40 publications

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“…Such result, according to the scientific literature, can be likely ascribed to the supplementary stresses induced on the blend by the second processing. This would allow a further dispersion/redistribution of the nanofiller with consequent higher intercalation level [32][33][34].…”

Section: Results and Discussion 31 X-ray Diffractometry (Xrd)mentioning

confidence: 99%

“…Moreover, in order to understand the possible different interactions of neat and degraded modified clay, composites were prepared in the melt and fully characterized. There are several works regarding the effect of reprocessing on the morphology and on the properties of polymer based nanocomposites, but to the best of our knowledge no similar studies was performed on nanocomposite based on polymer blends [29][30][31][32][33][34]. Aim of this work is to evaluate the influence of morphology, at nano and micro scale, achieved by different processing methods on the rheological and mechanical properties of blends of PA6/HDPE in the presence of OMM and different compatibilizing systems.…”

Section: Introductionmentioning

confidence: 99%

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Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Scaffaro¹,

Botta²,

Mistretta³

et al. 2013

Express Polym. Lett.

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Abstract. In this work, we studied the effect of the method of preparation and of reprocessing on the morphology and, consequently, on the physical properties of polyamide 6 (PA6)/ high density polyethylene (HDPE)-clay nanocomposite blends in the presence of different compatibilizers. In particular, the nanocomposites were obtained by melt mixing using a corotating twin screw extruder (E1). The blends thus obtained were re-extruded (E2) under the same operating conditions. Moreover, blends with the same final composition were produced using a masterbatch of the compatibilizer with the clay prepared in a separated stage in a batch mixer (MB). All the materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffractometry (XRD) analyses. In addition, the rheological behaviour and the, tensile and impact, properties were evaluated. The XRD and TEM analysis showed that re-extrusion slightly improves the morphology of the nanocomposites. A further improvement of the morphology, in terms of lower clay dimension and better dispersion, was observed in the MB blends. The results of the mechanical tests showed that reprocessing (E2) induced an increase of all the properties for all the three systems. A further general increase of the mechanical properties was showed by the MB blends.

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Section: Results and Discussion 31 X-ray Diffractometry (Xrd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Scaffaro¹,

Botta²,

Mistretta³

et al. 2013

Express Polym. Lett.

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“…It is observed that M w of PHBV decreases when the cycle number increases, which is synonymous of the occurrence of polymer degradation [24,25]. Indeed, after three and six cycles, M n of PHBV is reduced by almost 13 and 27 %, respectively.…”

Section: Molecular Weight Changesmentioning

confidence: 92%

“…It can be noted that the complex viscosity of PHBV is drastically reduced. Indeed, at 0.1 Hz and after one cycle, the complex viscosity value is 1,720 Pa s and after only two reprocessing cycles, the viscosity decreases strongly to 1,370 Pa s. After six cycles, the material becomes very fluid with a viscosity of 239 Pa s. The strong decrease in the viscosity with increasing the number of reprocessing cycles can be correlated to a decrease in the polymer molecular weights [23,25]. PHBV is prone to undergoing chain scission during the extrusion process and this effect is enhanced by multiple reprocessing cycles.…”

Section: Rheological Propertiesmentioning

confidence: 97%

Mechanical Recycling of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)/Polylactide Based Blends

et al. 2014

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The effects of recycling cycles (up to six repeated cycles) on the structure and properties of neat poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), neat polylactide (PLA) and PHBV/PLA: 50/50 (wt%) blends elaborated by melt molding process were investigated. The changes in the chemical structure, the morphology and the thermal, mechanical and rheological properties of the recycled materials were studied. The reduction of molecular weights of both PHBV and PLA showed the predominance of chain scission mechanism as a result of degradation inducing an enhancement of PHBV chain mobility, as also revealed by the increasing of the PHBV crystallinity measured using differential scanning calorimetry and wide angle X-ray scattering. Nevertheless, all these effects were significantly smaller for neat PLA and PHBV-PLA blends compared to those of neat PHBV. Contrary to PLA, PHBV seems to be relatively more sensitive to the thermomechanical degradation and the presence of PLA in the PHBV-PLA blend tends to partially prevent the degradation of PHBV. Mechanical results evidenced the great recyclability of PHBV/PLA blends, even after six reprocessing cycles, since the values of mechanical characteristics remain more or less constant compared to the initial ones revealing the preservation of the material mechanical properties. A stabilizing effect of PLA on the recyclability of PHBV-PLA blends was highlighted and it can be concluded that the incorporation of PLA in PHBV/PLA blends might be a promising route to extend the PHBV applications.

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“…Recently, polymer nanocomposites, have received a great interest because they exhibit good mechanical, thermal and barrier properties [14,15]. Due to the growing market of nanocomposites, the scientific literature has currently studied the effect of reprocessing of the nanocomposites based on conventional polymers [13,[16][17][18][19]. Moreover, several studies investigated the effect of the reprocessing on the properties of neat biodegradable polymers, such as PLA [5,6,8,20].…”

Section: Introductionmentioning

confidence: 99%

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

Scaffaro¹,

Sutera²,

Mistretta³

et al. 2017

Express Polym. Lett.

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Abstract. In this work the effect of multiple reprocessing was studied on molecular structure, morphology and properties of poly(lactic acid)/hydrotalcites (PLA/HT) nanocomposites compared to neat PLA. In addition, the influence of two different kinds of HT -organically modified (OM-HT) and unmodified (U-HT) -was evaluated. Thermo-mechanical degradation was induced by means of five subsequent extrusion cycles. The performance of the recycled materials was investigated by mechanical and rheological tests, differential scanning calorimetry (DSC), intrinsic viscosity measurements and SEM observation. The results indicated that the best morphology was achieved in the systems incorporating OM-HT. On increasing the extrusion reprocessing cycles, the properties showed behavior due to two opposite effects: i) chain scission due to thermo-mechanical degradation and ii) filler dispersion effect resulting from multiple processing. In particular, at low reprocessing cycles, both tensile and rheological properties seem to be mainly affected by HT dispersion, especially when OM-HT was added. After five reprocessing cycles, on the contrary, chain scission, i.e. thermo-mechanical degradation, dominated. As regards the effect of the presence of organic modifier in HT, the results indicated that this variable apparently did not affect the macroscopic performance of the nanocomposites, especially at high reprocessing cycles.

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The effects of reprocessing cycles on the structure and properties of polystyrene/Cloisite15A nanocomposites

Cited by 53 publications

References 40 publications

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Processing – morphology – property relationships of polyamide 6/polyethylene blend–clay nanocomposites

Mechanical Recycling of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate)/Polylactide Based Blends

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

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