Synthesis of high rubber styrene–EPDM–acrylonitrile graft copolymer and its toughening effect on SAN

Zeng, Zhiping; Wang, Lianshi; Cai, Tongmin; Zeng, Xiangbin

doi:10.1002/app.20579

Cited by 25 publications

(24 citation statements)

References 10 publications

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“…Figure 6 shows the SEM micrographs of impact-fractured surfaces of SAN resin (Figure 6a) and SAN/PEB-g-MAN blends containing different PEB content (Figures 6b-h). In Figure 6(a), the SAN resin fracture surface has a fragmented, flaky appearance resulting from crack break-up, which is a typical brittle characteristic, [19] so the impact energy dissipation is little. Figures 6(b) and (c) show the SEM micrographs of the fracture surface of SAN/PEBg-MAN blends containing 5 and 10 wt% PEB.…”

Section: Morphology Of Cryogenically Fractured Surfacementioning

confidence: 99%

Toughening Effect of Poly(ethene-co-1-butene)-graft-methyl Methacrylate and Acrylonitrile on Styrene-acrylonitrile Copolymer (SAN)

Zhu

Wang

Zhang

et al. 2010

Journal of Macromolecular Science, Part B

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Poly(ethene-co-1-butene)-graft-methyl methacrylate-acrylonitrile (PEB-g-MAN), synthesized by suspension grafting copolymerization of methyl methacrylate and acrylonitrile onto PEB, was blended with styrene-acrylonitrile copolymer (SAN). The mechanical properties, phase structure, toughening mechanism, miscibility, and thermal stability of the SAN/PEB-g-MAN blends were studied using a pendulum impact tester, tension tester, scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic mechanical analysis (DMA), and thermogravimetric analysis (TG). The results showed that PEB-g-MAN has an excellent toughening effect on SAN resin. The notched impact strength of the blends (containing 25 wt% PEB) was 63.3 kJ/m 2 , which was nearly 60 times that of SAN resin. The brittle-ductile transition of SAN/PEB-g-MAN blends occurred when the weight percentage of PEB was between 17.5 and ∼20 wt%. SAN and PEB-g-MAN were partially miscible. The toughening mechanism of the blends changed with the PEB content. When the PEB content was low, the toughening mechanism of the blends was branching and termination of cracks with slight cavitation. As the content of PEB increased, the toughing mechanism gradually changed from branching and termination of crack with slight cavitation to both branching and termination of crack and cavitation, to extensive cavitation, and finally to shear yielding accompanied by cavitation. The phase structure of the blends changed from a "sea-island'' structure to a cocontinuous structure as the PEB content increased. ATG analysis showed that the thermal properties of the SAN resin in the blends were enhanced by adding the PEB-g-MAN.

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Section: Morphology Of Cryogenically Fractured Surfacementioning

confidence: 99%

Toughening Effect of Poly(ethene-co-1-butene)-graft-methyl Methacrylate and Acrylonitrile on Styrene-acrylonitrile Copolymer (SAN)

Zhu

Wang

Zhang

et al. 2010

Journal of Macromolecular Science, Part B

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“…If the particle size is greater than the critical value the blends will still be a brittle and incompatible. For example, the effective toughness occurs at an optimum particle size of 0.1-1 μm for SAN [26] and when the optimum particle size of dispersed EPDM is achieved, necessary levels of adhesion with the SAN matrix is provided and effective increase of impact toughness is achieved. However, as the ratio of two polymers in blend progress toward equality, co-continuous phase is formed, Figure 7c.…”

Section: Morphology Of the Blendsmentioning

confidence: 99%

Morphology and thermal behaviour of SAN/EPDM blends

Ptiček¹,

Hrnjak-Murgić²,

Jelenčić³

et al. 2007

Express Polym. Lett.

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Abstract. Blends of styrene-acrylonitrile (SAN) with ethylene-propylene-diene (EPDM) with and without high impact polystyrene (HIPS) as a compatibilizer were studied. One series of blends was prepared in composition 95/5, 90/10, 85/15, 80/20 and 60/40; and the second series of blends was prepared with the addition of 5 wt% of HIPS. Their morphology and thermal behaviour were inspected by scanning electronic microscopy (SEM) and dynamic mechanic analysis (DMA), respectively. Further on, blends were separated to their components by Soxhlet extraction in selective solvent and characterized by Fourier Transform Infrared Spectroscopy (FTIR) and gel permeation chromatography (GPC), respectively. The results of morphological observations revealed that the addition of a small percentage of compatibilizer decreases the domain size of the dispersed phase and the compatibility of the blends was enhanced. The shifts of values of glass temperatures (Tg) in the examined blends also indicate that with addition of compatibilizer HIPS miscibility between SAN and EPDM is improved.

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“…Moreover, many research works have revealed that the use of ST as a co-monomer in graft copolymerization systems containing a high dissimilar polarity between the rubber backbone and a monomer (e.g. MMA [17,18], glycidyl methyl methacrylate [19] and acrylonitrile [20]) can enhance the grafting yields.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and aging resistance performance of acrylic sheets containing EPDM-graft-poly(styrene-co-methyl methacrylate)

2012

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The addition of ethylene-propylene-diene rubber (EPDM) into acrylic sheets was expected to enhance their thermal and UV aging resistance for outdoor applications. According to the dissimilar polarity of EPDM and styrene (ST)/methyl methacrylate (MMA) monomer mixture (20/ 80% (w/w)) used for preparation of acrylic sheets, this research aimed to modify EPDM via graft copolymerization with ST and MMA to increase its compatibility. The graft copolymerization of ST and MMA at a ST/MMA ratio of 25/75% (w/w) onto EPDM was carried out in the solution polymerization initiated by benzoyl peroxide at 90°C for 16 h, resulting in 88.1% grafting efficiency. The addition of 1.0-3.0% (w/w) of graft EPDM (GEPDM) into the acrylic sheets increased their impact strength (~17-22%), but decreased their flexural strength (~12-36%). However, their mechanical properties were improved after thermal and UV aging. Scanning electron microscopy (SEM) based analysis of the modified acrylic sheets revealed that the fracture surface shifted from brittle to ductile failure characteristics after modification. The thermogravimetric analysis results also exhibited that the addition of GEPDM improved the thermal and UV resistance of the modified acrylic sheets by increasing their initial decomposition temperature and activation energy of thermal decomposition.

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Synthesis of high rubber styrene–EPDM–acrylonitrile graft copolymer and its toughening effect on SAN

Cited by 25 publications

References 10 publications

Toughening Effect of Poly(ethene-co-1-butene)-graft-methyl Methacrylate and Acrylonitrile on Styrene-acrylonitrile Copolymer (SAN)

Toughening Effect of Poly(ethene-co-1-butene)-graft-methyl Methacrylate and Acrylonitrile on Styrene-acrylonitrile Copolymer (SAN)

Morphology and thermal behaviour of SAN/EPDM blends

Mechanical and aging resistance performance of acrylic sheets containing EPDM-graft-poly(styrene-co-methyl methacrylate)

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