Ternary Blends Of Poly Research Articles

Miscibility and Phase Separation Behavior in ternary Blends of Poly(vinylidene fluoride-hexafluoroacetone)/Poly(methyl methacrylate)/Poly(vinyl acetate)

Miscibility of both binary and ternary blends between poly(vinylidene fluoride-hexafluoroacetone) P(VDF-HFA), Poly(methyl methacrylate) (PMMA) and poly(vinyl acetate) (PVAc) was investigated by using dynamic mechanical and differential scanning calorimetric measurements. The interaction parameter in binary blends of P(VDF-HFA) and PMMA was −0.73 at 125°C and was largely affected by the existence of hexafluoroacetone units, compared with that of blends of poly(vinylidene fluoride) and PMMA. Phase separation behavior of this binary blends was elucidated by observing the change of transmittance on heating; the lower critical solution temperature (LCST) behavior was shown including both binodal and spinodal curves. Binary blends of P(VDF-HFA)/PVAc were also miscible and showed LCST behavior. Ternary blends of P(VDF-HFA)/PMMA/PVAC Were miscible in spite of immiscible binary blends of PMMA/PVAc and showed LCST phase diagram. After phase separation, ternary miscible blends were separated to two phases of P(VDF-HFA)/PMMA with very small domains of PVAc and P(VDF-HFA)/PVAc with also very small PMMA. At higher temperature, phase separation composed of P(VDF-HFA)/PMMA and P(VDF-HFA)/PVAc occurred.

Studies on Aluminium Sheets Bonded by Ternary Blends of Poly(Vinyl Chloride), Epoxidised Natural Rubber and Carboxylated Nitrile Rubber with Respect to Dynamic Mechanical Properties and Adhesion Strength

The peel strength of aluminium-aluminium joints bonded by an adhesive based on ternary 75/25/175 poly(vinyl chloride)/epoxidised natural rubber/carboxylated nitrile rubber blends was found to depend on moulding time. Dynamic mechanical studies of the Al-blend-Al composite structures provide useful information on adhesion. In addition, the composite structures were found to exhibit broad tan δ spectra from 0.093 to 0.411 over the temperature range from -2°C to 200°C. These composite structures may find use in various vibration isolation applications.

Studies on Aluminium Sheets Bonded by Ternary Blends of Poly(Vinyl Chloride), Epoxidised Natural Rubber and Carboxylated Nitrile Rubber with Respect to Dynamic Mechanical Properties and Adhesion Strength

The peel strength of aluminium-aluminium joints bonded by an adhesive based on ternary 75/25/175 poly(vinyl chloride)/epoxidised natural rubber/carboxylated nitrile rubber blends was found to depend on moulding time. Dynamic mechanical studies of the Al-blend-Al composite structures provide useful information on adhesion. In addition, the composite structures were found to exhibit broad tan δ spectra from 0.093 to 0.411 over the temperature range from -2°C to 200°C. These composite structures may find use in various vibration isolation applications.

Characteristics of binary and ternary blends of poly (p‐phenylene sulfide) with poly(bis phenol A) sulfone and polyetherimide

AbstractAn experimental study of the phase morphology and mechanical properties of binary blends of poly(p‐phenylene sulfide) (PPS) with both polyetherimide (PEI) and poly(bis phenol A) sulfone (PSF) is described. We also study the ternary system PPS‐PEI‐PSF. Differential scanning calirometry indicated the blends are immiscible; these findings were confirmed by scanning electron microscopy. Both PEI and PSF were found capable of improving the impact strength and elongation‐to‐break characteristics of PPS in binary blends and ternary systems.

Binary and ternary blends of poly(vinyl chloride), hytrel, and a polyurethane

AbstractBinary blends of poly(vinyl chloride) and a poly(ether urethane) containing 20 and 40 weight percent, respectively, of poly(vinyl chloride) have been prepared by solution blending from tetrahydrofuran and their degree of mixing investigated using dynamic mechanical analysis. In the polyurethane, transitions were found at −19°C and −119°C. The former was attributed to the glass transition and the latter to a Schatzki type of motion of the polyether sequences. This latter transition occurred at a temperature which is higher than the literature value for the low temperature transition in poly(tetrahydrofuran), which is equivalent to the polyether sequence in the polyurethane. This discrepancy is attributed to the influence of neighboring hard segments present because of incomplete segmental phase separation of the polyurethane. For the blends only one very broad transition was observed, indicating that there was substantial mixing of these two polymers. Three ternary blends were prepared, also by solution blending, containing poly(vinyl chloride), Hytrel, and the polyurethane in the ratios 1:1:1, 1:2:1, and 2:1:1, respectively. In the first two blends there was clear evidence of phase separation. It was only in the 2:1:1 blend that an apparently significantly compatible material resulted.

Polymer compatibility: Ternary blends of poly(vinylidene chloride‐co‐vinyl chloride), poly(vinyl chloride) and poly(acrylonitrile‐co‐butadiene)

AbstractMixtures of two compatible polymers, poly(vinyl chloride) and poly(acrylonitrile‐co‐butadiene) containing 40 percent acrylonitrile, can be compatible with poly(vinylidene chloride‐co‐vinyl chloride), which is incompatible and partially compatible respectively with these two polymers. The crystalline melting temperature and relative heat of fusion of poly(vinylidene chloride‐co‐vinyl chloride) in blends are higher than those in the pure component. This is attributed to greater ordering of the polymer chains in the crystalline phases of the blends. Replacing the rubber by poly(acrylonitrile‐cobutadiene) containing 30 percent acrylonitrile, shows that these three polymers, in which each pair is incompatible or at most partially compatible, also form compatible ternary blends. The crystalline melting temperature is higher and relative heat of fusion lower than those in the pure component. This is attributed to dissolving of parts of the polymer chains originally located in the crystalline phases in the amorphous phases of the blends.