Uso de argila organofílica na compatibilização de misturas PP/EPDM

Ferreira, Kaline Rosário Morais; Leite, Itamara Farias; Siqueira, Alex da S.; Raposo, Claudia M. O.; Carvalho, Laura H.; Silva, Suédina Maria de Lima

doi:10.1590/s0104-14282011005000072

Cited by 9 publications

(8 citation statements)

References 43 publications

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“…This addition reduced the size of the different phases, as shown in the micrographs. Similar results regarding the reduction of the domains in the blend were reported by Anadão 46 , Coelho and Morales 47 and Ferreira et al 48 when a single compatibilizer was used.…”

Section: Scanning Electron Microscopysupporting

confidence: 87%

Effect of Reprocessing Cycles on the Morphology and Mechanical Properties of a Poly(Propylene)/Poly(Hydroxybutyrate) Blend and its Nanocomposite

Oliveira

Silva

et al. 2021

Mat. Res.

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The use of polymer blends and composites based on fossil-based and bio-based polymers has become an important environmentally protective alternative for common use and disposable plastics applications such as packaging, bottles and trays. The disposal of these more degradable products, however, may also harm the environment and, therefore, recycling these systems becomes relevant. Recycling involves reprocessing which can significantly change the morphology and properties of polymeric products. Therefore, this study deals with the effects of reprocessing cycles on the properties and morphology of blends and nanocomposites based on fossil and bio-based polymers. The systems investigated were: a) neat polypropylene (PP), b) a polypropylene/poly(3-hydroxybutyrate) (PP/PHB) blend and c) PP/PHB/organoclay nanocomposite compatibilized with polypropylene-g-maleic anhydride (PP-g-MA) and erucamide. These materials were submitted to up to seven extrusion cycles in a single screw extruder operating at 60 rpm. Samples were taken after the first, third, fifth and seventh extrusion cycles and their tensile properties and morphology were determined. Scanning electron microscopy indicated that two phases were observed in the blend which showed spherical PHB domains. The addition of clay, PP-g-MA and erucamide improved the adhesion between the nanocomposites components. X-ray diffraction analysis showed that crystallinity tended to increase with the number of reprocessing cycles for all systems investigated up to the fifth cycle and then tended to decrease. A 10% crystallinity increase was observed for neat PP in the fifth cycle. In general, the tensile properties of all systems decreased with reprocessing and the highest losses were observed for the PP/PHB blend after seven processing cycles with 50% and 37% decreases in stress at break and elastic modulus, respectively. Impact strength of the PP matrix and of the PP/PHB blend tended to decrease with reprocessing, except for the nanocomposite which showed a slight increase especially after the seventh processing cycle in which an 18% increase in impact strength was observed.

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Section: Scanning Electron Microscopysupporting

confidence: 87%

Effect of Reprocessing Cycles on the Morphology and Mechanical Properties of a Poly(Propylene)/Poly(Hydroxybutyrate) Blend and its Nanocomposite

Oliveira

Silva

et al. 2021

Mat. Res.

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“…5 The development of PP/elastomer blends is one of the most commonly used methods to overcome this problem. 1,3,6–10…”

Section: Introductionmentioning

confidence: 99%

“…6 Consequently, there are many published studies on blends of PP and TPEs, such as styrene–butadiene–styrene (SBS) or styrene–ethylene–butylene–styrene (SEBS) triblock copolymers, aiming to improve the toughness of PP. 1,3,5–10,12–15…”

Section: Introductionmentioning

confidence: 99%

Morphological, mechanical, and thermal properties of PP/SEBS/talc composites

Oliveira

Rocha

Assis

et al. 2019

Journal of Thermoplastic Composite Materials

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The aim of this study is to evaluate the effect of some experimental variables such as the content of styrene–ethylene–butylene–styrene (SEBS) and talc, processing conditions and mixing protocol on the properties of polypropylene (PP). To achieve this objective, PP/SEBS blends and PP/SEBS/talc composites were processed in a corotating twin-screw extruder. A masterbatch of PP/talc was prepared before the extrusion of PP/SEBS/talc composites. The morphology of blends and composites was evaluated by scanning electron microscopy, which revealed the dispersion of small rubber droplets in the PP matrix. Moreover, the micrographs also showed that SEBS and talc particles were uniformly dispersed and distributed in the polymer matrix. Results of thermal properties showed that talc had a nucleating effect, which promoted the increase of both PP crystallization temperature and crystallinity degree. The incorporation of talc in PP/SEBS blends led to an expressive increase in the impact resistance by 70% as compared with the reference blend: PP/SEBS 80/20% (w/w). This result reveals that although the PP/SEBS/talc composites showed a separated morphology, the good dispersion and distribution of this mineral filler in the polymers contributed to avoid crack propagation and increase the impact properties. The tensile properties in the elastic region were not significantly affected.

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“…The addition of ATPa increased the complex viscosity of all nanocomposites. The addition of clay causes an increase in viscosity in polymeric matrices, particularly at low angular frequency 31,32 …”

Section: Resultsmentioning

confidence: 99%

Mechanical, thermal, rheological, and morphological characterization of polyolefin/activated attapulgite nanocomposites

Silva

Albers

Quinteiro

et al. 2023

J of Applied Polymer Sci

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Linear low‐density polyethylene (LLDPE) and high‐density polyethylene (HDPE) are polyolefins widely used in the packaging sector. Seeking to improve the mechanical properties with good cost‐effectiveness, attapulgite (ATP) was chosen as a reinforcing filler for the polyolefins. ATP is a hydrated magnesium and aluminum clay mineral with a microfibrous morphology, and the purity of this filler depends on the deposit. ATP is associated with the presence of accessory minerals that need to be removed so as not to interfere with its final application. Thus, an ATP purification process was carried out through physical separation and chemical treatment with hydrogen peroxide (H2O2) and sulfuric acid (H2SO4). This purification process despite having a low yield and is very effective in reducing impurities and organic matter. This ATP was named ATPa. LLDPE/ATPa and HDPE/ATPa nanocomposites with the addition of 1, 3, and 5 wt% of ATPa were prepared by extrusion and hot pressing. The mechanical properties (Shore D hardness, tensile tests, and Izod impact strength), thermal properties (differential scanning calorimetry—DSC and thermogravimetric analysis—TGA), X‐ray diffraction, rheological, and transmission scanning microscopy (TEM) were determined for these nanocomposites. The mechanical properties of the nanocomposites increased with the addition of ATPa. HDPE/ATPa nanocomposites showed more promise than LLDPE/ATPa nanocomposites. The addition of 5 wt% ATPa increased the tensile strength by 14% for the HDPE matrix and 5% for the LLDPE matrix and increased the elastic modulus by 46% for HDPE and 26% for LLDPE.

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Uso de argila organofílica na compatibilização de misturas PP/EPDM

Cited by 9 publications

References 43 publications

Effect of Reprocessing Cycles on the Morphology and Mechanical Properties of a Poly(Propylene)/Poly(Hydroxybutyrate) Blend and its Nanocomposite

Effect of Reprocessing Cycles on the Morphology and Mechanical Properties of a Poly(Propylene)/Poly(Hydroxybutyrate) Blend and its Nanocomposite

Morphological, mechanical, and thermal properties of PP/SEBS/talc composites

Mechanical, thermal, rheological, and morphological characterization of polyolefin/activated attapulgite nanocomposites

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