Thermal and mechanical properties of in situ polymerized PS/EPDM blends

Lourenço, Emerson; Felisberti, Maria I.

doi:10.1016/j.eurpolymj.2006.06.022

Cited by 37 publications

(53 citation statements)

References 35 publications

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“…Thus, the PS/ EPDM blends were submitted to photochemical aging in an apparatus developed by our research group, following the procedures in ASTM G53 standard. As previously reported, 13 in situ polymerized PS/EPDM blends present EPDM dispersed in the PS matrix. The phase behavior of these blends as well as their thermal and mechanical properties are strongly affected by the polymerization temperature.…”

Section: Resultssupporting

confidence: 53%

“…This is due to the stabilization caused by EPDM deactivating the formed PS macroradicals through intermolecular reactions. 9,13 Although commercial HIPS contains additives against degradation, it presented the highest CI, proving that it is more susceptible to photodegradation than PS/EPDM blends.…”

Section: Resultsmentioning

confidence: 97%

“…As discussed previously the extent of phase segregation, the morphology and the intrinsic properties of the elastomer are responsible for the main differences between the properties of in situ polymerized PS/EPDM blends and HIPS. 13 Fourier transformed infrared spectroscopy , indicates that chemical modifications occurred on the exposed surfaces of the blends. The yellowing observed in the exposed specimens is caused by the presence of chromophores and their interaction with the aromatic ring of the PS matrix.…”

Section: Resultsmentioning

confidence: 99%

“…HIPS contains 10 wt % of PB and flow index of 8 g/ 10 min (ASTM D1238-2008C/5 kg). The PS/EPDM blends were prepared by dissolving EPDM in styrene monomer, followed by bulk polymerization of the monomer at 60 and 808C for 168 h. 13 PS homopolymer was also prepared at 60 and 808C. Table I shows the composition of the PS/EPDM blends expressed in terms of ''wt % EPDM in the blends'' and the molar mass of the PS phase of the blends.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of photoaged in situ polymerized PS/EPDM blends

Lourenço

Felisberti

2007

J of Applied Polymer Sci

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In this study, the mechanical properties of in situ polymerized PS/EPDM blends with different composition were evaluated before and after accelerated photoaging and compared with the properties of commercial HIPS submitted to similar aging conditions (ASTM G53). The mechanical properties of the PS/EPDM blends as well as their photochemical stability are influenced by the polymerization temperature and blend composition. Although the initial mechanical properties of HIPS are superior in comparison with the in situ polymerized PS/EPDM blends, a pronounced drop of them was observed already for short time exposure. For example, after the aging period, all PS/EPDM blends showed higher strain at break than HIPS. Because PS/EPDM blends present higher resistance to photoaging stability than HIPS, the mechanical properties of the HIPS become worse than the other blends as the aging time increases.

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Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical properties of photoaged in situ polymerized PS/EPDM blends

Lourenço

Felisberti

2007

J of Applied Polymer Sci

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“…The incorporation of EPDM resulted in an apparent improvement of thermal stability. The stabilization is probably caused by the EPDM deactivating intermolecular reactions [22].…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Physical properties of irradiated thermoplastic elastomeric olefins based on (devulcanized rubber)/(high crystalline polypropylene) formulations

Hassan

Badway

Elnaggar

et al. 2014

Vinyl Additive Technology

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This work aims to produce thermoplastic elastomeric olefins based on devulcanized waste rubber (DR) and polypropylene (PP) compatibilized with poly(ethylenepropylene-diene monomer) (EPDM). The coupling of DR/PP in varying proportions with EPDM was investigated by Fourier-transform infrared, X-ray diffraction, and scanning electron microscopy techniques. A comparative study was established to evaluate the influence of EPDM content and radiation dose on the physical, mechanical, and thermal performance of DR/ PP/EPDM composites. It was found that the synergism of EPDM incorporation and irradiation conditions up to 100 kGy remarkably decreased the PP T m value, indicating a promotion in the PP and radiation sensitivity.

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Thermal and mechanical properties of polystyrene/poly(acrylonitrile‐g‐(ethylene‐co‐propylene‐co‐diene)‐g‐styrene) (AES) blends prepared by the in situ polymerization of styrene

Lourenço

Felisberti

2007

J of Applied Polymer Sci

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Polystyrene/AES blends formed by the in situ polymerization of styrene in the presence of poly (acrylonitrile-g-(ethylene-co-propylene-co-diene)-g-styrene) (AES) were prepared. AES is a commercial elastomer obtained by the radical copolymerization of styrene and acrylonitrile in the presence of an ethylene-propylene-diene terpolymer (EPDM). The polystyrene/AES blends presented two phases: an EPDM elastomeric phase dispersed in a rigid matrix. The phase behavior was strongly affected by the polymerization temperature. The blends showed higher thermal stability than the polystyrene homopolymer because of the stabilizing effect of EPDM incorporation. The mechanical properties were influenced by the polymerization temperature and blend composition. The blend prepared at 608C with 13.0 wt % AES presented an enhancement of 60% in the impact resistance, whereas the blend prepared at 808C with 21.8 wt % AES presented an enhancement of 150% in the strain at break. Both blends had these properties improved with a small loss in the Young's modulus.

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Thermal and mechanical properties of in situ polymerized PS/EPDM blends

Cited by 37 publications

References 35 publications

Mechanical properties of photoaged in situ polymerized PS/EPDM blends

Mechanical properties of photoaged in situ polymerized PS/EPDM blends

Physical properties of irradiated thermoplastic elastomeric olefins based on (devulcanized rubber)/(high crystalline polypropylene) formulations

Thermal and mechanical properties of polystyrene/poly(acrylonitrile‐g‐(ethylene‐co‐propylene‐co‐diene)‐g‐styrene) (AES) blends prepared by the in situ polymerization of styrene

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