Toughening of polypropylene with styrene/ethylene‐butylene/styrene tri‐block copolymer: Effects of mixing condition and elastomer content

Bassani, Adriane; Pessan, Luiz Antônio; Hage, Elias

doi:10.1002/app.2066

Cited by 56 publications

(55 citation statements)

References 25 publications

(61 reference statements)

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“…Exemplary SEM micrographs of the PP/SEP (75 : 25) and PP/SEBS (75 : 25) binary blends are shown in Figure 2. Other than that found for the blends with PET, the blends with polyolefin matrix showed a finely dispersed copolymer phase with nearly homogeneous morphology, in agreement with that reported by Bassani et al 19 for similar systems.…”

Section: Binary Blends Of Pet With Block Copolymerssupporting

confidence: 91%

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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Section: Binary Blends Of Pet With Block Copolymerssupporting

confidence: 91%

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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“…An important issue in SEBS-PP blends is the processing conditions (temperature profile, screw and feeding speed), due to mechanical properties on phase dispersion can vary according to the conditions. For instance, it has been reported that the impact resistance can be improved increasing rotor´s speed and feeding in twin screw extruder, while an increase on temperature profile produces a diminish in this property [8] . Interfacial interaction between PP and elastomeric can be improved by addition of compatibilizer, often a grafted block copolymer is used [9] .…”

Section: Introductionmentioning

confidence: 99%

Thermal & morphological evaluation of linear and radial SEBS- polypropylene blends

et al. 2013

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Blending of two or even more immiscible polymers is a very useful method to obtain new polymeric materials with ordered and tailored properties. Thermoplastic elastomers (TPE's) are interesting materials for various applications, including the automotive industry, due to their excellent balance between processability and physical properties, especially using hydrogenated styrene-butadiene copolymer. In the present work, two structures of styreneethylene/buthylene-styrene (SEBS) triblock copolymer (linear and radial) were blended with polypropylene (PP) using a process aid oil. Three different SEBS-PP ratios were evaluated. Phase behavior was studied by means of differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and Scanning electron microscopy (SEM), which confirmed the formation of a single phase material. PP crystallinity was affected by SEBS structure causing a lamellar thinning of crystals. The SEM analysis shows that radial and linear structures of SEBS have different morphology.

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“…For instance, PP offers a flexural modulus of ∼1.52 GPa (1 Pascal = 1 N/m 2 ), and also offers better impact properties and good chemical resistance than other polyolefins [1, 2]. There are many studies related to the improvement of the mechanical properties of PP, for example, the addition of elastomer particles, such as SEBS improves their impact resistance but significantly reduces its stiffness and yield strength [1–4]. Improvement in impact resistance of PP was obtained with the addition of calcium carbonate (CaCO 3 ) [5].…”

Section: Introductionmentioning

confidence: 99%

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

Valerio-Cárdenas¹,

Romo-Uribe²,

Cruz-Silva³

2010

Polymer Engineering & Sci

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The thermal properties of isotactic polypropylene (iPP) reinforced with polyaniline‐grafted‐short glass fibers (PAn‐g‐SGF) at 10, 20, and 30 wt% concentration and iPP blended with 5 wt% PP‐grafted‐maleic anhydride (PP‐gMA) and 30 wt% of PAn‐g‐SGF were investigated. iPP crystallizes into a spherulitic morphology, the microfiller promoted larger spherulite size and higher dynamic modulus, but the overall degree of crystallinity decreased as the concentration of PAn‐g‐SGF increased. The melting temperature, Tm, was not influenced by the microfiller. However, the crystallization temperature, Tc, as determined by DMA, first decreased reaching a minimum at ca. 20 wt%, and then increased, in contrast with Tc determined by DSC, it increased as concentration increased. The initial reduction in Tc observed by DMA seems to be associated with the crystallites growing from the microfiller into the matrix, the overall molecular dynamics then being less affected. On the other hand, increase in Tc above 20 wt% concentration suggests that the percolation threshold could be responsible for these results. Addition of the maleic anhydride copolymer produced higher shear modulus, transition temperatures, and activation energy, suggesting higher interaction between microfiller and polymer matrix. POLYM. ENG. SCI., 2011. © 2010 Society of Plastics Engineers

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Toughening of polypropylene with styrene/ethylene‐butylene/styrene tri‐block copolymer: Effects of mixing condition and elastomer content

Cited by 56 publications

References 25 publications

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

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

Thermal & morphological evaluation of linear and radial SEBS- polypropylene blends

Electrically conducting polypropylene/polyaniline‐grafted‐short glass fiber composites: Microstructure and dynamic mechanical analysis

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