Reactive compatibilization of PA6/LDPE blends with an ethylene–acrylic acid copolymer and a low molar mass bis-oxazoline

Scaffaro, R.; Mantia, Francesco Paolo La; Canfora, Loredana; Polacco, Giovanni; Filippi, Sara; Magagnini, Pier Luigi

doi:10.1016/j.polymer.2003.06.001

Cited by 83 publications

(61 citation statements)

References 22 publications

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“…[5][6][7][8][9] A low-molecular-weight bisoxazoline compound has also been successfully used together with EAA to enhance the formation of compatibilizers by in situ reactions. [10] Similar successful results have been obtained by using PE functionalized with glycidyl methacrylate, [9,11,12] with other methacrylic compounds, [11,13] or with maleic anhydride. [14,15] Cyclo(organo)phosphazenes (CP) are low-molecularweight phosphazene derivatives, whose cyclic structure is formed by repeating -P--N units, each phosphorus bearing two substituent groups (usually, but not necessarily, organic in nature).…”

Section: Introductionsupporting

confidence: 62%

“…This is probably due to some compatibilization effect as already stated in several other works. [10,11,13,42] These effects are even more evident when the CP compounds are added. In this case the viscosity is the highest, in particular at low frequencies when the tendency to an yield stress can be observed, especially in the HDPE-based blends (see Figure 3).…”

Section: Resultsmentioning

confidence: 99%

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On the Preparation and Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene/Acrylic Acid Copolymer and of New Phosphazene Compounds

Scaffaro

Mistretta

Mantia

et al. 2006

Macro Chemistry & Physics

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Summary: Samples of HDPE and PA6 have been melt‐processed in the presence of two new phosphazene compounds, CP‐2EPOX and CP‐2OXA together with an ethylene/acrylic acid copolymer. The blends have been prepared in an industrial twin‐screw extruder by using PA6 and PE in weight ratios of 25/75 and 75/25. When used, 5 phr of EAA and 0.2 phr of CP have been added. The materials have been completely characterized from a rheological, morphological, and mechanical point of view. The results indicate that the additives used caused an increase in the rupture tensile properties, of the impact strength and viscosity especially in the PE‐rich blend in the presence of CP‐2EPOX. This result can be attributed both to a chain extension reaction on EAA and PA6 phases and on compatibilization effect due to the possible formation of EAA‐g‐PA6 copolymers. This latter occurrence is suggested by an improved adhesion between the phases and by an increased turbidity observed in the Molau tests. Between the two compatibilizers, the CP‐2EPOX displays the overall best results, especially for the PE‐based blends.

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Section: Introductionsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

On the Preparation and Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene/Acrylic Acid Copolymer and of New Phosphazene Compounds

Scaffaro

Mistretta

Mantia

et al. 2006

Macro Chemistry & Physics

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“…A similar increase in melt viscosity at low shear rate has been reported for various systems with reactive compatibilizers. 17,24,25 The torque values, measured at the end of the blending process, also were affected by the copolymer concentration and functionalization. The addition of neat copolymers to PET/PP blends did not affect the torque in a visible way: the values recorded for blends with SEBS, SEPSEP, and SEPs were in the range of 8 -10 Nm and were similar that of the noncompatibilized blend (10.2 Nm).…”

Section: Rheological Behaviormentioning

confidence: 99%

Reactive mixing of PET and PET/PP blends with glycidyl methacrylate–modified styrene‐b‐(ethylene‐co‐olefin) block copolymers

Pracellà

Chionna²,

Pawlak

et al. 2005

J of Applied Polymer Sci

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Styrene-b-(ethylene-co-butylene)-b-styrene (SEBS) and styrene-b-(ethylene-co-propylene) (SEP, SEPSEP) block copolymers with different styrene contents and different numbers of blocks in the copolymer chain were functionalized by melt radical grafting with glycidyl methacrylate (GMA) and employed as compatibilizers for PET-based blends. Binary blends of PET with both functionalized (SEBS-g-GMA, SEP-g-GMA, SEPSEP-g-GMA) and neat (SEBS, SEP, SEPSEP) copolymers (75 : 25 w/w) and ternary blends of PET and PP (75 : 25 w/w) with various amounts (2.5-10 phr) of both modified and unmodified copolymers were prepared in an internal mixer, and their properties were evaluated by SEM, DSC, melt viscosimetry, and tensile and impact tests. The roles of the chemical structure, grafting degree, and concentration of the various copolymers on blend compatibilization was investigated. The blends with the grafted copolymers showed a neat improvement of phase dispersion and interfacial adhesion compared to the blends with nonfunctionalized copolymers. The addition of grafted copolymers resulted in a marked increase in melt viscosity, which was accounted for by the occurrence of chemical reactions between the epoxide groups of GMA and the carboxyl/hydroxyl end groups of PET during melt mixing. Blends with SEPSEP-g-GMA and SEBS-g-GMA, at concentrations of 5-10 phr, showed a higher compatibilizing effect with enhanced elongation at break and impact resistance. The effectiveness of GMA-functionalized SEBS was then compared to that of maleic anhydride-grafted SEBS.

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“…Blends of polyamides with polyolefins and polyesters are particularly interesting and attractive from an industrial point of view. During the last years, it has been shown that such blends can be efficiently compatibilized with numerous compounds derived from maleic anhydride, acrylic acid, glycidyl methacrylate, oxazoline, etc., grafted onto the polyolefin chain so that hydrogen bonds, or even covalent bonds, can be formed between the two polymers at the blending stage [10][11][12][13][14][15][16][17][18]. Nanocomposites based on polyethylene (PE) and polyamide (PA) blends have also been studied.…”

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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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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Reactive compatibilization of PA6/LDPE blends with an ethylene–acrylic acid copolymer and a low molar mass bis-oxazoline

Cited by 83 publications

References 22 publications

On the Preparation and Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene/Acrylic Acid Copolymer and of New Phosphazene Compounds

On the Preparation and Characterization of Polyethylene/Polyamide Blends by Melt Processing in the Presence of an Ethylene/Acrylic Acid Copolymer and of New Phosphazene Compounds

Reactive mixing of PET and PET/PP blends with glycidyl methacrylate–modified styrene‐b‐(ethylene‐co‐olefin) block copolymers

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

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