The miscibility and phase separation in binary blends of poly(vinyl chloride) with methyl methacrylate/acrylonitrile copolymers

Lath, D.; Lathová, E.; Cowie, J. M. G.

doi:10.1002/macp.1993.021941113

Cited by 12 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…tells us that at low temperatures the second term of Eq (6). dominates, whereas at high temper-atures it is negligible resulting in the same situation as discussed above for e = 0.…”

supporting

confidence: 55%

“…As Eqs. (6) and (8) show for miscible polymers with X A B c 0 and e = 0, the free-energy parameter Xis a monotonously increasing function of temperature. Hence, ASCM" > 0 follows and the critical point is an LCST.…”

Section: Employing Eqs (2) and ( 3 ) One Getsmentioning

confidence: 99%

“…Especially, the excess free energy is governed by the freeenergy parameter X presented in Eq. (6). Now, one can simply add the contribution of the elastic free energy (21') to the parameter X .…”

Section: Theoretical Considerationsmentioning

confidence: 99%

See 2 more Smart Citations

The phase behavior of polymer blends – Effects of thermodynamics and rheology

Kammer

1991

Acta Polymerica

View full text Add to dashboard Cite

Part one of the paper is devoted to the thermodynamics of the phase behaviour of polymer blends. According to an equation-of-state theory the phase behaviour is directed by the interplay of three effects: the interaction between the segments, the free-volume effect, and the size-effect. When the size-effect is negligible only lower critical solution temperature (LCST) behaviour occurs. Phase separation at elevated temperatures is an entropy driven process whereas at an upper critical solution temperature (UCST) an unfavourable enthalpic effect associated with the size-effect acts as driving force for phase separation. Also positive volumes of mixing can be related to the size-effect. In the second part the phase behaviour of blends exposed to shear is discussed. For blends it has been found experimentally that shear flow elevates phase-separation temperatures. Obviously, shear-induced phase changes depend on the stored elastic excess energy. A negative stored excess energy corresponds to an additional attraction between the different segments, hence, the miscibility region of the system is enlarged. Theoretical and experimental results agree qualitatively. Das Phasenverhalren von Polymermischungen -Effekte der Thermodynamik und der RheologieIm ersten Teil der Arbeit wird die Thermodynamik des Phasenverhaltens von Polymermischungen beschrieben. Entsprechend der Theorie korrespondierender Zustlnde wird das Phasenverhalten durch das Zusammenwirken von drei Effekten bestimmt: der Wechselwirkung zwischen den Segmenten, dem Freien-Volumen-Effekt und dem Grokneffekt. Wenn der Grokneffekt vernachlissigbar ist, tritt nur eine untere kritische Losungstemperatur auf (LCST-Verhalten). Die Phasentrennung bei hoheren Temperaturen ist ein Entropie-bestimmter Proze5, wlhrend bei einer oberen kritischen Losungstemperatur (UCST) ein ungiinstiger Enthalpieeffekt zusammen mit dem GroDeneffekt als treibende Kraft fur die Phasentrennung wirkt. Auch positive Mischungsvolumina konnen mit dem Grokneffekt zusammenhangen. Im zweiten Teil wird das Phasenverhalten von Mischungen behandelt, die Scherkraften ausgesetzt sind. Bei Mischungen wurde experimentell gefunden, daB Scherfliekn die Temperatur der Phasentrennung erhoht. Die durch Scherung hervorgerufenen Phasenlnderungen hingen offenbar mit der gespeicherten elastischen Exze5-Energie zusammen. Eine negative gespeicherte ExzeB-Energie entspricht einer zudtzlichen Anziehungskraft zwischen verschiedenen Segmenten, daher wird der Mischbarkeitsbereich des Systems vergroBert. Die theoretischen und experimentellen Ergebnisse stimmen qualitativ iiberein. *

show abstract

“…tells us that at low temperatures the second term of Eq (6). dominates, whereas at high temper-atures it is negligible resulting in the same situation as discussed above for e = 0.…”

supporting

confidence: 55%

Section: Employing Eqs (2) and ( 3 ) One Getsmentioning

confidence: 99%

See 1 more Smart Citation

The phase behavior of polymer blends – Effects of thermodynamics and rheology

Kammer

1991

Acta Polymerica

View full text Add to dashboard Cite

show abstract

“…The segmental interaction parameters have been also used to explain the "miscibility window" or "miscibility chimney" in polymer/copolymer or copolymer/copolymer blends (Lath and Cowie 1988). These parameters have been found useful to predict miscibility of blends containing one component whose structure is systematically varied, e.g., polyesters with either halogenated polymers or phenoxy (Prud'homme 1982; Harris et al 1983;Woo et al 1985, polyamide blends (Ellis 1989), ternary blends (Shah et al 1986), and other systems, viz., SAN/PMMA, SAN/PC, polyethyloxazoline/polyester, PPE with a mixture of PoClS and PpClS, PC/PCL/phenoxy, and many more.…”

Section: Heat Of Mixing Approachmentioning

confidence: 99%

Thermodynamics of Polymer Blends

Manias

Utracki

2014

Polymer Blends Handbook

View full text Add to dashboard Cite

“…3,4 Compatible blends are therefore most desired, because of homogeneous mixing on molecular level and the development of superior mechanical properties. 5 Considerable effort has been made to obtain the blend of most commercial polymers like poly(methyl methacrylate), 6,7 poly(styrene), 8,9 poly (ethylene), 10,11 poly(vinylchloride), 12,13 and others. Polymethacrylic acid(PMAA) is a hard, brittle, and transparent material.…”

Section: Introductionmentioning

confidence: 99%

Miscibility studies on linseed oil epoxy blend with poly(methacrylic acid)

Ashraf

Ahmad

Riaz

et al. 2005

J of Applied Polymer Sci

View full text Add to dashboard Cite

ABSTRACT:With the aim to utilize a vegetable oil epoxy, a product from a sustainable resource, for improving the properties of polymethacrylic acid (PMAA), the blends of the latter with the epoxy of linseed oil were prepared in solution by mechanical mixing of the requisite amounts of the two components in dimethylsulphoxide. Freestanding films of the blend were cast. The miscibility of the two components was investigated by viscosity, ultrasonic, and density measurements which showed that the two components were semicompatible in solution. The compatibility in solid phase was also examined by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), which revealed that linseed oil epoxy (LOE) and PMAA were incompatible. The films of blend of all compositions were found to be sticky, which was caused by the oozing of LOE.

show abstract

The miscibility and phase separation in binary blends of poly(vinyl chloride) with methyl methacrylate/acrylonitrile copolymers

Cited by 12 publications

References 25 publications

The phase behavior of polymer blends – Effects of thermodynamics and rheology

The phase behavior of polymer blends – Effects of thermodynamics and rheology

Thermodynamics of Polymer Blends

Miscibility studies on linseed oil epoxy blend with poly(methacrylic acid)

Contact Info

Product

Resources

About