Rheological properties and UV photo-oxidation of montmorillonite-filled random propylene–ethylene copolymers

Riechert, Verónica Mariel; Ferrofino, Aníbal Sergio Gustavo; Quinzani, Lidia M.; Failla, Marcelo Daniel

doi:10.1007/s00289-022-04202-5

Cited by 5 publications

(9 citation statements)

References 40 publications

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“…A broad band between 1680 and 1740 cm −1 can also be appreciated in N10I, N10II, and N10IV, that can be assigned to new chemical species, like acid groups, produced in the reaction between the AGs and oMt. The observed behavior has already been seen in polyolefin homo‐ and copolymers based in the same oMt and maleic grafted compatibilizers 27–29 …”

Section: Resultssupporting

confidence: 56%

“…As it is well known, a functionalized polyolefin is needed to generate a NC by melt blending PP and the type of oMt used in this study. Moreover, it has been demonstrated that the AGs of the compatibilizer react with the organophilic Mt playing a key role in disaggregating/exfoliating the clay 27–29 . What differentiates Procedure III from the others is the fact that oMt is impregnated with MA before being added to the polymer.…”

Section: Resultsmentioning

confidence: 99%

“…The FT‐IR spectra of polymers and NCs are shown in Figure 4. Two regions are exhibited, one including the absorbance bands associated to carbonyl groups (between 1900 and 1600 cm −1 ) and the other containing the band at 1040 cm −1 that corresponds to SiOSi groups of the clay 29 . Spectra were normalized with the area of the absorbance band at 2720 cm −1 corresponding to the methine groups of PP backbone, and arbitrarily shifted along the y ‐axis for legibility reasons.…”

Section: Resultsmentioning

confidence: 99%

“…Analyzed surfaces were obtained with a cryo‐ultramicrotome from specimens used in rheological characterization. The surfaces were chemically treated to enhance contrast between clay and polymer using an etching technique previously described 29 . All NCs display small clay particles homogeneously distributed.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it has been demonstrated that the AGs of the compatibilizer react with the organophilic Mt playing a key role in disaggregating/ exfoliating the clay. [27][28][29] What differentiates Procedure III from the others is the fact that oMt is impregnated with MA before being added to the polymer. Agglomeration of particles must be occurring during that step, being the mixing process that follows unable to reverse that event.…”

Section: Structural Characterizationmentioning

confidence: 99%

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Polypropylene nanocomposites produced by in‐situ grafting of maleic anhydride using different mixing procedures

Merchán Sandoval,

Failla,

Quinzani

2024

Polymer Composites

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Nanocomposites (NC) of polypropylene (PP) and organophilic montmorillonite (oMt) are produced by reactive mixing with simultaneous grafting of maleic anhydride (MA) onto PP using organic peroxide as initiator. Five different strategies of incorporating reactants and clay into a laboratory mixer are used. The structure of composites is examined by FT‐IR spectroscopy, x‐ray diffraction and scanning electron microscopy. Rotational rheometry, thermogravimetry and oxygen permeability are used to evaluate properties. The preparation method has a remarkable influence on NC's structure. Simultaneous addition of peroxide and MA to molten PP followed by incorporation of clay 20 minutes later produces the best degree of clay exfoliation/disaggregation. The NCs obtained using this procedure are highly transparent and have very thin tactoids with interlayer spacing more than 50% larger than the original oMt. The incorporation of just 2 wt% of clay gives place to more than 30% reduction in PP oxygen permeability. Additionally, the temperature at the maximum thermal degradation rate in nitrogen reduces in about 60°C while the temperature at which the thermal degradation process begins is not affected.Highlights Highly intercalated/exfoliated PP/oMt nanocomposites are synthesized Reactive mixing procedure affects the quality of nanocomposite's structure A initial period of grafting before clay addition is the most effective method Highly transparent materials with small tactoids of d001>4 nm is generated PP oxygen permeability is highly reduced by the use of just 2 wt% of nanoclay

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

See 3 more Smart Citations

Polypropylene nanocomposites produced by in‐situ grafting of maleic anhydride using different mixing procedures

Merchán Sandoval,

Failla,

Quinzani

2024

Polymer Composites

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Sequential Reactive Processing for the Synthesis of Branched Polypropylene and Propylene–Ethylene Copolymer

Guapacha,

Quinzani,

Failla

2024

J of Applied Polymer Sci

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Polypropylene (PP) and random propylene–ethylene copolymer (PEC) with long‐chain branches (LCB) have been synthesized from linear polymers by sequential melt reactive processing. The process starts with the grafting of low concentrations of maleic anhydride using an organic peroxide as a radical initiator. Then, halfway through the processing time, the chain‐linking agent, m‐xylylenediamine (XDA), is added to the reactive medium to generate branched molecular structures. The occurrence of grafting and chain‐linking reactions was confirmed by infrared spectroscopy, size exclusion chromatography, and dynamic and transient extensional rheology. Branched polymers with up to ~1 branch per 1000 monomer units were achieved without largely altering the average molecular weights of the original materials and their tensile mechanical properties. The amount of LCB obtained in PEC practically doubles that in the branched PP. Properties such as maximum tensile stress, elastic modulus, and tensile stress at yield were found to be primarily a function of the molecular weight and crystallinity level of the polymers, and not of their degree of LCB. Altogether, the results demonstrate that grafting low concentrations of maleic anhydride onto the polymer with the addition of the chain‐linking agent at half processing time is an efficient and practical method to produce polymers with improved melt strength.

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Comparative characterization of the viscoelastic properties of additive manufacturing polymers

Singh,

Chen,

Youssef

2024

Mech Time-Depend Mater

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Rheological properties and UV photo-oxidation of montmorillonite-filled random propylene–ethylene copolymers

Cited by 5 publications

References 40 publications

Polypropylene nanocomposites produced by in‐situ grafting of maleic anhydride using different mixing procedures

Polypropylene nanocomposites produced by in‐situ grafting of maleic anhydride using different mixing procedures

Sequential Reactive Processing for the Synthesis of Branched Polypropylene and Propylene–Ethylene Copolymer

Comparative characterization of the viscoelastic properties of additive manufacturing polymers

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