Study of the recrystallization of poly(butylene adipate)

Yagfarov, M.Sh.

doi:10.1016/0032-3950(75)90042-8

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…Melting transitions were recorded at a scanning rate of 5 °C/min, and the melting point was obtained from the peak temperature of the endotherm. The degree of crystallinity of both PVF 2 and PBA components was calculated from the area under their respective melting endotherms, using the value of the heat of fusion of 100% crystalline material (93.2 J/g for PVF 2 15 and 107.3 J/g for PBA) and normalizing with respect to blend composition. For the determination of glass transition temperatures, the instrument was cooled using liquid nitrogen and operated at a scanning rate of 20 °C/min.…”

Section: Methodsmentioning

confidence: 99%

Miscible Blends of Two Crystalline Polymers. 1. Phase Behavior and Miscibility in Blends of Poly(vinylidene fluoride) and Poly(1,4-butylene adipate)

1996

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The phase behavior and miscibility of blends of poly(vinylidene fluoride) (PVF2) and poly(1,4-butylene adipate) (PBA), both semicrystalline polymers, have been investigated using differential scanning calorimetry and light-scattering techniques. The phase diagram of this blend system exhibits a single glass transition temperature over the entire composition range, two distinct melting transitions, and a cloud-point curve above a lower critical solution temperature of 235 °C. A depression of the equilibrium melting point of both PVF2 and PBA is observed. From the melting point data of the high-T m component, PVF2, a value for the polymer−polymer interaction parameter of χ12 = −0.19 was derived using the Flory−Huggins equation. This implies that PVF2/PBA blends are thermodynamically miscible in the melt. The extent of the melting point depression for the low-T m component, PBA, is much smaller than it is for PVF2, which is attributed to the fact that PVF2 is semicrystalline at temperatures of PBA melting. Infrared spectroscopy measurements focusing on the carbonyl absorption band of PBA reveal a slight shift in peak position toward lower frequencies due to blending, indicating that the thermodynamic miscibility of the PVF2/PBA pair arises from weak specific interactions involving the polyester carbonyl group. In spite of their miscibility, blends of PVF2 and PBA exhibit a complex phase behavior and may form multiphase systems. Of particular interest is the three-phase morphology in which two distinct crystalline phases (PBA and PVF2) coexist with an intimately mixed amorphous phase. This morphology is observed at room temperature over a very broad composition range.

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Section: Methodsmentioning

confidence: 99%

Miscible Blends of Two Crystalline Polymers. 1. Phase Behavior and Miscibility in Blends of Poly(vinylidene fluoride) and Poly(1,4-butylene adipate)

1996

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“…24 For PBAd, it was assumed to be 21.46 kJ mol −1 . 67,68 The excess free energy of the copolymers as a function of the composition is plotted in Fig. 11a.…”

Section: Thermodynamics Of Melting Point Depressionmentioning

confidence: 99%

Crystallization of poly(butylene-2,6-naphthalate-co-butylene adipate) copolymers: regulating crystal modification of the polymorphic parent homopolymers and biodegradation

2014

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Polyester–polycarbonate blends. V. Linear aliphatic polyesters

Cruz

Paul

Barlow

1979

J of Applied Polymer Sci

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SynopsisPolycarbonate blends with the linear aliphatic polyesters poly(ethy1ene succinate) (PES), poly-(ethylene adipate) (PEA), poly(l,4-butylene adipate) (PBA), and poly(hexamethy1ene sebacate) (PHS) were prepared by solution casting. Blends containing PES, PEA, and PBA exhibited a single Tg by DSC and thus form a single, miscible amorphous phase with polycarbonate. However, blends containing PHS exhibited only partial miscibility. Crystallinity of the polyesters was reduced by mixing with polycarbonate; however, plasticization by the polyesters induced crystallization of the polycarbonate. Miscibility in these systems is the result of an exothermic heat of mixing stemming from an interaction of the carbonyl dipole of the ester group with the aromatic carbonate. The effect of polyester structure on miscibility with polycarbonate is interpreted by and correlated with heats of mixing obtained by direct calorimetry of low molecular weight liquid analogs of the polymers.

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Study of the recrystallization of poly(butylene adipate)

Cited by 8 publications

References 10 publications

Miscible Blends of Two Crystalline Polymers. 1. Phase Behavior and Miscibility in Blends of Poly(vinylidene fluoride) and Poly(1,4-butylene adipate)

Miscible Blends of Two Crystalline Polymers. 1. Phase Behavior and Miscibility in Blends of Poly(vinylidene fluoride) and Poly(1,4-butylene adipate)

Crystallization of poly(butylene-2,6-naphthalate-co-butylene adipate) copolymers: regulating crystal modification of the polymorphic parent homopolymers and biodegradation

Polyester–polycarbonate blends. V. Linear aliphatic polyesters

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