Properties of miscible blends of polyglutarimide with poly(styrene-co-maleic anhydride)

Prinos, J.; Tselios, Ch.; Bikiaris, Dimitrios N.; Panayiotou, Costas

doi:10.1016/s0032-3861(97)00167-5

Cited by 18 publications

(15 citation statements)

References 19 publications

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“…As can also be seen, the ultimate properties showed an almost linear behavior with composition, with both slight positive (mean deviation 1.6%) and negative (mean deviation 6.0%) deviations in the break stress and strain, respectively. The ductility of miscible blends may follow a linear rule,50,51 as well as both positive42,43,52 and negative deviations 5,46,53,54. The previously stated lack of blending induced decrease in free volume agrees with the close to linear behavior of the ductility values.…”

Section: Resultssupporting

confidence: 77%

New Miscible Poly(ether imide)/Poly(phenyl sulfone) Blends

Ramiro¹,

Eguiazábal²,

Nazábal³

2006

Macro Materials & Eng

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Summary: Blends of PEI and PPSU were prepared directly during the plasticization step of an injection molding process throughout the full composition range. The molded blends were transparent and showed a single glass transition and no dispersed phase by SEM. These characteristics did not allow the presence of a single miscibilized phase to be inferred unambiguously due to the very similar Tgs and refractive indices of the two components of the blends. Miscibility was inferred after close observation of the position, height and area of the enthalpy relaxation peak of the 50/50 blend. The modulus of elasticity and yield stress changed linearly with composition, leading to polymer materials with intermediate characteristics. The linearity was attributed to the lack of decrease in free volume induced by mixing and to the similar orientation of the components before and after mixing. The PPSU presence only slightly reduced the known tendency towards brittle fracture of PEI under notched impact conditions, but the presence of a single amorphous phase led to an expected ductile behavior of the blends close to that predicted by the single rule of mixtures.

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Section: Resultssupporting

confidence: 77%

New Miscible Poly(ether imide)/Poly(phenyl sulfone) Blends

Ramiro¹,

Eguiazábal²,

Nazábal³

2006

Macro Materials & Eng

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“…The maximum of tan δ peak, which corresponds to the glass transition, is at about 140°C for SMA14 and at 138°C for PGI. These values are about 5°C higher than the corresponding T g 's calculated with DSC 14. Such a difference is very common between the two methods.…”

Section: Resultsmentioning

confidence: 57%

“…SMA copolymers have a structure similar to PS and can form miscible blends with many polymers 13. In a previous article of ours, we found that SMA copolymer containing 14 wt % maleic anhydride is fully miscible with PGI throughout the whole composition range 14…”

Section: Introductionmentioning

confidence: 59%

Blends of polymers with similar glass transition temperatures: A DMTA and DSC study

Bikiaris

Prinos

Botev

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:The miscibility of different polymer blends was studied with dynamic mechanical thermal analysis (DMTA) in conjunction with differential scanning calorimetry (DSC). The blends were prepared by melt mixing polymers having similar glass transitions such as polyglutarimide (PGI), styrene-co-maleic anhydride random copolymers (SMA), and polystyrene (PS). In PGI/SMA blends, there is only one glass transition detected with DMTA. In the case of PGI/SMA14 blends, the single glass transition temperature is due to their full miscibility. However, PGI/SMA8 blends are immiscible throughout the whole composition range as was verified by optical observation (opaque appearance), DSC, and scanning electron microscopy. The observation of only one glass transition by DMTA was attributed to weak interactions that take place between the two polymers, leading to partial mutual solubility and bringing the slightly different T g temperatures of the pure polymers even closer. In SMA8/SMA14 blends, there are two glass transitions detected with DSC as well as with DMTA, indicating that the two copolymers are immiscible. However, in all compositions, shifts of the glass transitions were observed with DMTA, which is evidence of partial miscibility. The observation of immiscibility was easiest in PS/SMA blends by both techniques, because of the bigger difference in glass transition temperatures of the initial polymers.

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“…Therefore, the specific volume of mixing appears to be the main reason for the ductility values shown in Figure 8. This is supported by the fact that the ductility of miscible polymer blends is usually close to additive, 22,36 although positive 16,19 and negative deviations 40,41,45 have been found. The negative deviations are usually attributed to a decrease in the free and specific volumes as a result of mixing.…”

Section: Mechanical Propertiesmentioning

confidence: 90%

“…14,15,18,35,36 In continuous mixing by In the rest of the blends, the barrel temperature was 260°C. means of extruders, however, the torque cannot be related to the viscosity of the melt.…”

Section: Processabilitymentioning

confidence: 99%

Solid state features and mechanical properties of PEI/PBT blends

Vallejo

Eguiazábal

Nazábal

2001

J. Appl. Polym. Sci.

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Extrusion-blended and injection-molded PEI/PBT blends were found to be miscible whatever the composition. The processability of the blends clearly improved with the presence of PBT. The melt pressure at the exit was seen to be a parameter as representative of the processability of the blends as the torque of blending. In the blends with 80 and 90% PBT, a positive volume of mixing and the maintenance of the crystallinity of PBT were seen. However, in the rest of the blends, negative volumes of mixing and important decreases in the crystallinity of PBT were found. These solid state features gave rise to a ductility similar to that of the pure PEI and to a synergism of the modulus of elasticity and of the yield stress in the 90/10 and 80/20 blends such that the values were higher than those of either of the pure components.

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Properties of miscible blends of polyglutarimide with poly(styrene-co-maleic anhydride)

Cited by 18 publications

References 19 publications

New Miscible Poly(ether imide)/Poly(phenyl sulfone) Blends

New Miscible Poly(ether imide)/Poly(phenyl sulfone) Blends

Blends of polymers with similar glass transition temperatures: A DMTA and DSC study

Solid state features and mechanical properties of PEI/PBT blends

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