Processing-morphology relationships of compatibilized polyolefin/polyamide blends

Willis, J. M.; Caldas, V.; Favis, Basil D.

doi:10.1007/bf00612413

Cited by 115 publications

(63 citation statements)

References 42 publications

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“…This fact could lead to the reverse effect observed in the mechanical properties. 7,14,29 The mechanical results, and, in particular, the behavior of the toughness (elongation and impact properties), confirm the compatibilizing role of Surlyn for the PET/HDPE blend.…”

Section: Resultssupporting

confidence: 69%

Properties and morphology of poly(ethylene terephthalate) and high‐density polyethylene blends

Guerrero

Lozano

González

et al. 2001

J of Applied Polymer Sci

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Blends of poly(ethylene terephthalate) (PET) and high-density polyethylene (HDPE) with and without a compatibilizing agent were studied. Both materials are widely used in the soft drink bottle industry. The compatibilizing agent was a copolymer of ethylene and methacrylic acid partially neutralized with zinc (Surlyn). The olefinic segment of Surlyn is compatible with HDPE, whereas the Surlyn carboxylic acid groups is affine with the PET carbonyl groups. The effectiveness of the compatibilizing agent was evaluated using different techniques, such as infrared spectroscopy, differential scanning calorimetry, scanning electron microscopy, and mechanical properties.

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Section: Resultssupporting

confidence: 69%

Properties and morphology of poly(ethylene terephthalate) and high‐density polyethylene blends

Guerrero

Lozano

González

et al. 2001

J of Applied Polymer Sci

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“…[30][31][32][33]49 Simple models based on shear flow fields inside twin-screw extruders have been proposed for the semiquantitative prediction of blend morpholThe effect of the mixing process on morphology development in polymer blends has been described by several authors20,21,51-56-, however, most of these studies have employed nonreactive systems. In general, corotating twin-screw extruders lead to more effective control of blend morphology compared to that achieved in single-screw extruders because of their more intensive mixing, better control over the residence time, self-wiping of the screws, and better heat-transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of extruder type on the properties and morphology of reactive blends based on polyamides

Majumdar

Keskkula

Paul

1994

J of Applied Polymer Sci

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The morphology and mechanical properties of polyamide-based blends prepared in single and corotating twin-screw extruders were compared using transmission electron microscopy (TEM) techniques. Reactive polyamide blends with SEBS-g-MA ( a maleated styrenic triblock copolymer with ethylene-butylene midblocks) , EPR-g-MA ( a maleated ethylene/ propylene rubber), and ABS were selected for the purpose of this investigation. For blends of SEBS-g-MA with difunctional (nylon x,y) polyamides (e.g., nylon 6,6; nylon 12,12), the twin-screw extruder was more effective in producing a finer dispersion of the rubber phase, which resulted in a significant lowering of the ductile-brittle transition temperature in case of the nylon 6,6 blend. On the other hand, blends of SEBS-g-MA with the monofunctional nylon 6 material led to rubber particles that were too small for toughening for both extruder types employed in this work. For nylon 6/EPR-g-MA blends, the singlescrew extruder led to blends with excellent low-temperature impact properties for both single-step and masterbatch mixing techniques, whereas nylon 6 /EPR-g-MA blends prepared in a single-step operation in the twin-screw extruder were brittle under ambient conditions. For difunctional polyamide blends with ABS (compatibilized with an imidized acrylic polymer), the morphology and mechanical properties were found to be independent of the extruder type employed for processing.

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“…The previous work of Favis et al, [13,14] concerning the relationships among the number-average diameter (d n ) or volume-average diameter (d v ) and polydispersity (d v /d n ) of droplets and the volume content (j) of the dispersed phase in about 20 groups of three-pairs of immiscible polymer blend melts with different R v and t/s, elucidated that d n , d v , and d v /d n all increase with j, and that these d n (or d v ) and j data are well superimposed on a master curve of d n (or d v ) plotted against j þ j 2 . This indicates that j plays a decisive role in the droplet diameter, so that the influences of R v , s, and t on breakup, coalescence, and then on the final diameter of the droplets are essentially eliminated.…”

Section: Resultsmentioning

confidence: 99%

In‐Situ Fiberized Poly(ethylene terephthalate) as a Reinforcement to Poly(propylene) Matrix

Shen

Huang

Sheng-wu

2003

Macro Materials & Eng

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The reinforced poly(propylene) (PP)/poly(ethylene terephthalate) (PET) in‐situ fiberized composites were prepared by extrusion‐drawing‐injection molding. The influences of PET weight fraction (fw) on the PET fiberization, phase morphology, and mechanical properties of the composites, together with their functional mechanisms were studied by contrast to the normal‐blended materials without drawing. The results show that as the fw rises from 0 to 20%, the number of PET fibers increases, whereas their diameter and dispersity decrease till fw = 15% and then increase, and the number of remained PET particles tends to rise. These changes of PET fiberization and phase morphology with fw were attributed to the consequence of the combined actions of breakup, coalescence, and deformation of the PET dispersed phase in the PP matrix during the extrusion drawing. Correspondingly, the tensile strength (σt) and Young's modulus (E) of the in‐situ composites increase till fw = 15% and then decrease, with maximum gains of σt and E of about 20 and 70% relative to the neat PP, respectively. This σt/fw relation was ascribed to the counterbalanced result between the reinforcing effect of the dispersed phase on matrix and the interfacial flaw effect of two immiscible phases, while the E/fw relation was considered as a representation of the rigidizing effect of the fibers on the matrix being controlled by both their number and diameter.In‐situ PET fibres (PET/PP = 85/15) in an as‐drawn filament.magnified imageIn‐situ PET fibres (PET/PP = 85/15) in an as‐drawn filament.

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Processing-morphology relationships of compatibilized polyolefin/polyamide blends

Cited by 115 publications

References 42 publications

Properties and morphology of poly(ethylene terephthalate) and high‐density polyethylene blends

Properties and morphology of poly(ethylene terephthalate) and high‐density polyethylene blends

Effect of extruder type on the properties and morphology of reactive blends based on polyamides

In‐Situ Fiberized Poly(ethylene terephthalate) as a Reinforcement to Poly(propylene) Matrix

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