Melt rheology of compatible binary blends: Poly(ethylene oxide)‐poly(methyl methacrylate) and poly(ethylene oxide)‐poly(vinyl acetate)

Martuscelli, E.; Vicini, L.; Seves, Alberto

doi:10.1002/macp.1987.021880313

Cited by 20 publications

(9 citation statements)

References 7 publications

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“…-The evidence of a single glass transition temperature within the range from 220K (T, PEO) and to nearly , and a single I3C-NMR relaxation time TI at T = 333 K and T = 363 K [14].…”

Section: Phase Behaviour In Peoipmma and Peoiptbma Blendsmentioning

confidence: 99%

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Crystallization and melting behaviour in block copolymers of poly(ethylene oxide) with amorphous components. The influence of compatibility

Unger¹,

Donth

1991

Acta Polymerica

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By means of DSC, connections between melt crystallization (TJ and melting temperatures (T,) ofblock copolymers have been studied as depending on the compatibility of the block copolymer components. As examples for a compatible and an incompatible system, the systems poly(ethy1ene oxide) (PEO, crystalline)-poly(methy1 methacrylate) (PMMA, amorphous) and PEO/poly(tert.-butyl methacrylate) (PTBMA, amorphous), respectively, were used. The compatibility of both systems is described. In block copolymers of compatible components, T, depends on the composition, but it is less than in comparable blends. Provided a sufficient crystallization time is available, T, is, in effect, only dependent on the PEO molecular weight. In block copolymers of incompatible components both T, and T, were strongly determined by molecular weights ofall blocks of both components and, connected with that, by PEO domain sizes. T, vs. T,,, diagrams are presented and discussed. Kristallisationsund Schmelzverhalten in Blockcopolymeren des Poly(ethy1enoxid)s mit amorphen Komponenten. Der EinjluJ der Ver traglichkeit Mittels DSC-Untersuchungen wurden ZusammenhHnge zwischen Kristallisations-(TJ und Schmelztemperaturen (T,) inBlockcopolymeren in Abhlngigkeit von der Vertrlglichkeit der Copolymerkomponenten fur die Kristallisation aus der Schmelze untersucht. Als Beispiel fur ein vertrlgliches System wurde Poly(ethy1enoxid) (PEO, kristal1in)-Poly(methy1methacrylat) (PMMA, amorph) ausgewlhlt ; das unvertrlgliche System ist PEO-Poly(tert.-butylmethacrylat) (PTBMA, amorph). Das Vertrlglichkeitsverhalten beider Systeme wird beschrieben. In Blockcopolymeren aus vertrlglichen Komponenten hiingt T, von der Zusammensetzung ab, jedoch ist T, geringer als in vergleichbaren Blends. Ausreichende Kristallisationszeit vorausgesetzt, hlngt T , im wesentlichen nur von der PEO-Blockmolmasse ab. In Blockcopolymeren aus unvertriglichen Komponenten werden sowohl T, als auch T, stark von den Blockmolmassen der Einzelkomponenten und den damit verbundenen PEO-Domlnengrokn bestimmt. Es werden T,-T,-Diagramme vorgestellt und diskutiert.

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“…-The evidence of a single glass transition temperature within the range from 220K (T, PEO) and to nearly , and a single I3C-NMR relaxation time TI at T = 333 K and T = 363 K [14].…”

Section: Phase Behaviour In Peoipmma and Peoiptbma Blendsmentioning

confidence: 99%

“…-Strong reduction of crystallization and nucleation rates [14] and the crystallinity per gram PEO with increasing PMMA content [13] (see also Fig. 2).…”

Section: Phase Behaviour In Peoipmma and Peoiptbma Blendsmentioning

confidence: 99%

Crystallization and melting behaviour in block copolymers of poly(ethylene oxide) with amorphous components. The influence of compatibility

Unger¹,

Donth

1991

Acta Polymerica

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“…Homopolymers of polyacrylates were obtained from commercial sources as noted in Table 11. SAA copolymers a t 8, 14, 18,20,22, and 31 wt % AA were prepared via reaction extrusion polymerization (8,14,18, and 20 wt % AA), and solution polymerization in t-butanol (30 wt % solids) (2.0 mmol benzoyl peroxide/mol monomer), a t 80°C (22 and 31 wt %). The inherent viscosity (25°C; 0.2 wt % solution in T H F ) , the glass transition temperature (DSC), and the composition ('%-NMR) for these copolymers are listed in Table 111.…”

Section: Methodsmentioning

confidence: 99%

Miscibility of poly(vinyl acetate) and vinyl acetate‐ethylene copolymers with styrene‐acrylic acid and acrylate‐acrylic acid copolymers

Bott

Kuphal

Robeson

et al. 1995

J of Applied Polymer Sci

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SYNOPSISPoly(viny1 acetate) and vinyl acetate-ethylene (VAE) copolymers compose one of the more important polymeric materials, widely employed in coating and adhesive applications. A new class of miscible polymer blends involving poly(viny1 acetate) and VAE with styreneacrylic acid and acrylate-acrylic acid copolymers has been found. Experimental windows of miscibility as a function of the ethylene content for VAE copolymers and the acrylic acid content of the acrylate-acrylic acid copolymers are observed (acrylate = methyl acrylate, ethyl acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate). Employing well-established analog heat of mixing measurements, predicted windows of miscibility were compared with experimental results. Fair qualitative agreement was observed and supported the hypothesis that specific rejection arguments can be employed to explain the observed miscibility. Failure to quantitatively predict miscibility based on the analog heat of mixing measurements may be due to the higher association tendencies of the model compounds relative to acrylic acid units in the high molecular weight polymers. No miscible combinations were found for methyl methacrylate-acrylic acid copolymers or acrylate-methacrylic acid copolymers in admixture with poly(viny1 acetate) or the VAE copolymers, thus indicating the sensitivity of phase behavior to minor structural changes. VAE (30 wt % ethylene) copolymers were also noted to be miscible with several polymers previously noted to be miscible with poly(viny1 acetate), namely, poly(viny1idene fluoride), poly(ethy1ene oxide), and nitrocellulose. 0 1995 John Wiley & Sons, Inc. I NTRO D UCTl ONPoly (vinyl acetate) and vinyl acetate copolymers are among the more important commodity polymers utilized in the large coating and adhesive markets. As such, polymer blends comprising vinyl acetatebased polymers are of significant interest. As vinyl acetate-based polymers have been available for over 60 years, a large number of blend combinations have been reported in the open and patent literature. The study presented here discusses a new class of polymer blends miscible with poly (vinyl acetate) ( PVAc) and vinyl acetate-ethylene (VAE) (270 wt % VAc ) copolymers, namely, acrylate-acrylic acid and styrene-acrylic acid copolymers.

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“…Miscibility and crystallization in polymer blends continue to attract a lot of interest because they involve important issues concerning control of supermolecular structures as well as the corresponding physical and material properties. Although most of the research has focused on amorphous/crystalline polymer blends,1–18 few conclusive studies on crystalline/crystalline polymer blends exist 2, 14, 19–23. Because of the effects of liquid–liquid (L–L) separation associated with the crystallization of both components, phase behavior of binary crystalline blends becomes very complicated.…”

Section: Introductionmentioning

confidence: 99%

Phase behavior and crystallization analysis in binary crystalline blends of syndiotactic polypropylene and ethylene—Propylene random copolymer

Huang

Chang

Shimizu

et al. 2004

J Polym Sci B Polym Phys

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The effects of liquid–liquid (L–L) phase separation on the crystallization behavior of binary syndiotactic polypropylene (sPP) and ethylene–propylene random copolymer (PEP) mixtures are examined by phase‐contrast microscopy (PCM), differential scanning calorimetry (DSC), and cloud point measurements. The PCM experiments reveal that blends of sPP and PEP exhibit a lower critical solution temperature behavior in the melt. The L–L phase diagram, constructed in terms of temperature (T) and composition by cloud point measurements, follows the prediction of the Flory–Huggins theory with the interaction parameter between sPP and PEP [χ(T) = 0.01153 − 4.5738/T (K)]. When the blends are melted within the two liquid‐phase (α and β) regions, because of the fact that each phase domain reaches the equilibrium concentration ϕ italicPEPα and ϕ italicPEPβ as well as the phase volume fraction να and νβ, the crystallinity of each component obeys the equation XC,I = να X italicC,Iα + νβ X italicC,Iβ, I = PEP, sPP. Also, the equilibrium melting temperatures of both components remain constants, slightly lower than those of neat polymers. For the sPP/PEP blends crystallized from one homogeneous phase in the melt, we observe that the crystallizability of the major component is not greatly affected upon blending. However, the crystallization behavior of the minority component in the presence of the major component is strongly dependent on the crystallization temperature (Tc). When Tc is high, because the decreasing degree of the minority mobility is much greater than the increasing degree of the formed nuclei, the crystallizability of the minor component is depressed significantly. On the other hand, the promotion of the minority crystallizability in the intermediate regime of Tc is mainly because of the large increase of the heterogeneous nuclei upon blending with a major component. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2995–3005, 2004

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Melt rheology of compatible binary blends: Poly(ethylene oxide)‐poly(methyl methacrylate) and poly(ethylene oxide)‐poly(vinyl acetate)

Cited by 20 publications

References 7 publications

Crystallization and melting behaviour in block copolymers of poly(ethylene oxide) with amorphous components. The influence of compatibility

Crystallization and melting behaviour in block copolymers of poly(ethylene oxide) with amorphous components. The influence of compatibility

Miscibility of poly(vinyl acetate) and vinyl acetate‐ethylene copolymers with styrene‐acrylic acid and acrylate‐acrylic acid copolymers

Phase behavior and crystallization analysis in binary crystalline blends of syndiotactic polypropylene and ethylene—Propylene random copolymer

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