Thermal behaviour of polymer blends: a comparison of the thermal properties of miscible and immiscible systems

Lizymol, P. P.; Thomas, Sabu

doi:10.1016/0141-3910(93)90061-m

Cited by 91 publications

(41 citation statements)

References 6 publications

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“…Polymer blending has been reported to have great impact on the thermal stability of polymers [5][6][7][8][9][10][11][12][13]. Compatibility between two components in a binary blend is one of the decisive factors, which determines the thermal stability of polymer blends [14][15][16][17][18][19], and therefore compatibilisation has profound effect on the thermal stability of polymer blends.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation and crystallisation studies of reactively compatibilised polymer blends

Jose

Thomas

Biju

et al. 2008

Polymer Degradation and Stability

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Section: Introductionmentioning

confidence: 99%

Thermal degradation and crystallisation studies of reactively compatibilised polymer blends

Jose

Thomas

Biju

et al. 2008

Polymer Degradation and Stability

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“…It is known that T in is the evaluation criterion of the thermal stability of general materials, so the increase of T in shows that the addition of good heat-resistant PEB increases the thermal stability of SAN resin. Lizymol and Thomas [21] considered that the thermal stability of blends is related not only with the thermal stability of the two components but also with the interfacial interaction between the two components. Generally, when the interfacial interaction force between the two components is stronger, the thermal stability of the blends is better.…”

Section: Thermal Stabilitymentioning

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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“…Whereas MWCNTs act as radical scavengers at low loadings [14] delaying the degradation pattern and enhancing thermal stability, it has also been reported that the enhancement in thermal conductivity on MWCNT addition to the matrix lowers the degradation temperatures [32]. The thermal stability of the nanocomposites depends to a certain extent on the interaction between the phases [33] (which can be presumed to be good here at least from the matrix perspective as PPE/PS is miscible) and the amount of residual metal catalyst in the MWCNTs which was used for their production. The quality of dispersion obtained by process conditions and the effect of polymer degradation also has to be accounted for.…”

Section: Characterization Of the Compositesmentioning

confidence: 99%

Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene – Processing and characterization

Sathyanarayana

Wegrzyn²,

Olowojoba³

et al. 2013

Express Polym. Lett.

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Abstract. 4 wt% multiwalled carbon nanotubes (MWCNTs) were incorporated into a miscible blend of polyphenylenether/ polystyrene (PPE/PS) on a twin-screw extruder at a screw speed of 600 rpm. The masterbatch obtained was diluted at 400 and 600 rpm to obtain lower MWCNT loadings in PPE/PS. Electron microscopy & optical microscopy images show very good MWCNT dispersion even at high filler loadings of 4!wt%, but slightly larger agglomerate size fractions are observable at higher screw speeds. While MWCNT addition enhanced the thermal stability of PPE/PS, a small change in glass transition was observed on the composites at different filler concentrations compared to PPE/PS. The specific heat capacity at glass transition decreases considerably until 2!wt% MWCNT and levels down thereafter for both processing conditions pointing to enhanced filler-matrix interaction at lower loadings. Storage modulus of the nanocomposites was enhanced significantly on MWCNT incorporation with reinforcing effect dropping considerably as a function of temperature, especially at lower filler contents. The modulus and the tensile strength of PPE/PS were only marginally enhanced in spite of excellent MWCNT dispersion in the matrix. Electrical percolation occurs at 0.4!wt% MWCNT content, and the electrical conductivity of 0.5!wt% MWCNT reinforced PPE/PS was close to 12 orders in magnitude higher compared to PPE/PS.

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Thermal behaviour of polymer blends: a comparison of the thermal properties of miscible and immiscible systems

Cited by 91 publications

References 6 publications

Thermal degradation and crystallisation studies of reactively compatibilised polymer blends

Thermal degradation and crystallisation studies of reactively compatibilised polymer blends

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

Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene – Processing and characterization

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