Solvent effects on the miscibility of poly(methyl methacrylate)/poly(vinyl acetate) blends

Crispim, Edson Golembievski; Rubira, Adley F.; Muniz, Edvani C.

doi:10.1016/s0032-3861(98)00653-3

Cited by 57 publications

(40 citation statements)

References 27 publications

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“…It is known the effect of the solvent on the miscibility of a polymer pair. For instance, PMMA/PVAc is miscible in chloroform at 30°C whereas in DMF, at the same temperature, the blend is immiscible [55]. Regarding PEO/starch blends, they were prepared by casting from aqueous solution.…”

Section: Thermal Analysis From Dsc Datamentioning

confidence: 99%

Polymer-polymer miscibility in PEO/cationic starch and PEO/hydrophobic starch blends

Pereira¹,

Paulino²,

Rubira³

et al. 2010

Express Polym. Lett.

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IntroductionBlending of polymers is an interesting route for producing new materials, basically due to economics aspects [1]. The miscibility between the polymers is a very important factor in the development of polymer blends [1,2]. Considering the low entropy associated to the polymers mixture, ΔS m , the miscibility between the components of a polymer blend is mainly driven by the enthalpy of mixing, ΔH m . Thus, effects that decrease ΔH m will favor to the miscibility due to the decrease of the Gibbs energy of mixture, ΔG m . In the light of this, attractive interactions among side groups or polymer segments are, in most of the cases, responsible for polymer-polymer miscibility. Different techniques have been used for evaluating the miscibility, for example, thermal analysis through determination of the glass transition temperature (T g ) [3][4][5], microscopy (Optical Microscopy -OM, Scanning Electronic Microscopy -SEM, Atomic Force Microscopy -AFM, Transmission Electronic Microscopy -TEM, and so on) [5][6][7][8] and spectroscopy (Fourier Transform Infrared -FTIR-Image, Raman-Image, Nuclear Magnetic Resonance -NMR, and so on) [9][10][11][12]. The presence of an amorphous (or slightly crystalline) component affects the crystallization process of the other polymer component significantly. When a given system is miscible, the equilibrium melting temperature (T m 0 ) is expected to be lower Abstract. The main purposes were evaluating the influence of different starches on the miscibility with Poly(ethylene oxide) (PEO) and their effects on the spherulite growth rate. Polymer-polymer miscibility in PEO/cationic starch and PEO/hydrophobic starch blends consisting of different w/w ratios (100/0, 95/05, 90/10, 80/20, 70/30, 65/35 and 60/40) was investigated. This analysis was based on the depression in the equilibrium melting temperature (T m 0 ). By treating the data of thermal analysis (Differential Scanning Calorimetry -DSC) with Nishi-Wang equation, a positive value (0.68) was found for the interaction parameter of PEO/cationic starch. For PEO/hydrophobic starch blends, a negative value (-0.63) was obtained for the interaction parameter. The results suggested that PEO/cationic starch system should be immiscible. However, the system PEO/hydrophobic starch was considered to be miscible in the whole range of studied compositions. Through optical microscopy analysis, it was concluded that the spherulite growth rate is significantly affected by changing the amount and the type of starch as well. Keywords

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Section: Thermal Analysis From Dsc Datamentioning

confidence: 99%

Polymer-polymer miscibility in PEO/cationic starch and PEO/hydrophobic starch blends

Pereira¹,

Paulino²,

Rubira³

et al. 2010

Express Polym. Lett.

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“…Although it was expected that the casting solvent would influence the blend miscibility and thus the properties of blends, limited articles studying the solvent effect on the properties of blends were published. [12][13][14][15][16][17][18][19] The solvent effect on the miscibility of polystyrene/poly(vinyl methyl ether) blends was investigated. 14 The results showed that the blend cast from toluene or benzene was compatible, whereas incompatible blend was obtained on casting from chloroform.…”

Section: Introductionmentioning

confidence: 99%

“…14 The results showed that the blend cast from toluene or benzene was compatible, whereas incompatible blend was obtained on casting from chloroform. For the PMMA/poly(vinyl acetate) (PVAc) blend, it was reported [17][18][19] as a miscible blend when chloroform was used as a casting solvent and as an immiscible blend when N,N-dimethyl formamide or tetrahydrofuran were used. However, the miscibility of PMMA/PVAc blend depends on the casting temperature when the solvent, toluene, was used.…”

Section: Introductionmentioning

confidence: 99%

“…However, the miscibility of PMMA/PVAc blend depends on the casting temperature when the solvent, toluene, was used. 19 For the PEO/PVAc blends, the compatible blends were obtained on casting from benzene or chloroform according to the observation of their single composition-dependent glass transition temperatures of blends. However, the benzenecast blends had more homogeneous morphology, and the crystallization of PEO was more easily suppressed than it was in the chloroform-cast blends.…”

Section: Introductionmentioning

confidence: 99%

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Casting solvent effect on crystallization behavior and morphology of poly(ethylene oxide)/poly(methyl methacrylate)

Liau

Chang

2000

J. Appl. Polym. Sci.

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Poly(ethylene oxide) (PEO)/poly(methyl methacrylate) (PMMA) blends were prepared by casting from either chloroform or benzene solvents. After casting from solvents, all samples used in this study were preheated to 100°C and held for 10 min. Then, the solvent effect on the crystallization behavior and thermodynamic properties were studied by differential scanning calorimeter (DSC). Also, the morphology of spherulite of casting film was studied by polarized optical microscope. From the DSC and polarizing optical microscopy (POM) results, it was found that PEO/PMMA was miscible in the molten state no matter which casting solvent was used. However, the crystallization of PEO in the chloroform-cast blend was more easily suppressed than it was in the benzene-cast blend. Relatively, the chloroform-cast blend showed the greater melting-point depressing of PEO crystals. Also, the spherulite of chloroform-cast film showed a coarser birefringence. It was supposed that the chloroform-cast blend had more homogeneous morphology. It is fair to say that polymer blends, cast from solvent, are not necessarily in equilibrium. However, the benzene-cast blends still were not in equilibrium even after preheating at 100°C for 10 min.

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“…A análise da miscibilidade/compatibilidade de blendas poliméricas através de viscosidade é uma técnica simples, versátil e de baixo custo para a sua caracterização [65,[72][73][74][75][76][77], quando comparadas a técnicas como microscopia eletrônica, espectroscopia e análises térmicas.…”

Section: Viscosimetriaunclassified

Misturas de poliestireno e poliéster líquido-cristalino.

Matroniani¹

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Solvent effects on the miscibility of poly(methyl methacrylate)/poly(vinyl acetate) blends

Cited by 57 publications

References 27 publications

Polymer-polymer miscibility in PEO/cationic starch and PEO/hydrophobic starch blends

Polymer-polymer miscibility in PEO/cationic starch and PEO/hydrophobic starch blends

Casting solvent effect on crystallization behavior and morphology of poly(ethylene oxide)/poly(methyl methacrylate)

Misturas de poliestireno e poliéster líquido-cristalino.

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