Phase separation studies on poly(vinylidene fluoride) and poly(methyl methacrylate) quenched blends

Martínez‐Salazar, Javier; Canalda, J. C.; Vallejo, B.

doi:10.1002/masy.19940780110

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…-35°C). This lower transition should be the glass transition in agreement with T g reported for the completely amorphous PVDF [13][14]. This observation would actually reconcile the two standpoints usually proposed for the origin of the β-transition .…”

Section: Discussionsupporting

confidence: 90%

“…The β-transition is then assigned to the PVDF amorphous region [6]. Recently, Martines-Salazar et al [13][14] have reported that the glass transition temperature-composition relationship for the completely amorphous PVDF/PMMA blends could be fitted by the Gordon-Taylor equation [16]. This result is in accord with previous observations by Hirata and Kotaka [6], at least until the PVDF content does not exceed 60wt%.…”

Section: Introductionsupporting

confidence: 76%

“…It is worth recalling that the PVDF/PMMA pair is completely miscible in the melt, at least below the lower critical solution temperature (LCST) 11 . Expectedly, crystallization of PVDF from these monophase blends depends on blend composition and cooling rate [5,7,[12][13][14][15]. Two different models have been proposed to describe the phase morphology of the PVDF/miscible polymer blends.…”

Section: Introductionmentioning

confidence: 99%

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D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

Liu

Maréchal

Jérôme

1997

Polymer

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The origin of the β transition in poly(vinylidene fluoride) (PVDF) is still a pending question. This transition has been studied by dynamic mechanical analysis (d.m.a.) and differential scanning calorimetry (d.s.c.) in dependence on sample annealing and dilution with e-caprolactam (CPL). The β transition temperature is increased upon annealing and thus influenced by the polymer crystallization. Upon addition of CPL, there is no systematic shift in the β transition temperature, in contrast to the PVDF crystallinity that increases steadily. A shoulder on the low temperature side of the β transition peak is also observed as a result of annealing. It is shifted to lower temperatures when CPL is added, consistently with a glass transition. It thus appears that the so-called β-transition is sensitive to the amorphous material, but in a close relationship with the polymer crystallization. Comparison of the observations by d.s.c, and d.m.a, shows that the broad transition observed for the unannealed samples would result from the overlap of two transitions: the glass transition of the unconstrained amorphous phase and the glass transition of chains constrained by the crystalline phase. This situation can account for the complex dependence of the β transition on the polymer history.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

Liu

Maréchal

Jérôme

1997

Polymer

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“…Poly(ethylene glycol) (PEG) is a hydrophilic polymer that is soluble in water and numerous organic solvents. PEG has a typical spherulite structure when it is crystallized from a solution or quenched below its melting point of about 53 °C 1–5. It also exhibits biocompatibility 6.…”

Section: Introductionmentioning

confidence: 99%

Preparation of oligoamide‐ended poly(ethylene glycol) and hydrogen‐bonding‐assisted formation of aggregates and nanoscale fibers

Hua

Yang

Gong

et al. 2005

J. Polym. Sci. A Polym. Chem.

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An oligoamide-ended poly(ethylene glycol) (PEG) with a PEG weight-average molecular weight of 5000 (PEG-5000-oligoamide), with 3,5-bis-[2-(5-acetylamino-2isobutoxy-benzoylamino)-acetylamino]-benzoyl as the oligoamide, was synthesized. PEG-5000-oligoamide aggregated in chloroform or toluene via hydrogen-bonding interactions among the oligoamide strands as a core and PEG, which was soluble in the solvents, as a shell. When a chloroform solution of PEG-5000-oligoamide at a concentration of approximately 0.06 g/L was cast onto a silicon wafer or a mica plate, rapid solvent evaporation induced its self reassembly as nanofibers.

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“…The crystallization and melting behavior of semicrystalline polymers are dramatically influenced by the presence of other components. It is well established that structural parameters such as the lamellar thickness, crystal interphase, and spherulitic growth rates are substantially1–3 modified by further components. Moreover, the equilibrium melting temperature will change because of specific interactions between the components of the mixtures and also because of changes in the free energy for the formation of nuclei 4.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of poly(ethylene oxide) from its melt and from mixtures with tetrahydronaphthalene and oligo(ethylene oxide‐block‐dimethylsiloxane)

Madbouly¹,

Wolf²

2004

J Polym Sci B Polym Phys

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The crystallization of poly(ethylene oxide) (PEO) from the pure state and from its mixtures with oligo(dimethyl siloxane-b-ethylene oxide) (COP) and tetrahydronaphthalene (THN) was investigated. The crystallization kinetics was studied isothermally and nonisothermally with an automated device that monitored the light passing through the corresponding liquids as functions of time and/or temperature. The rate was strongly influenced by the concentration of COP in the mixture. A substantial decrease in the induction time (the time required for the onset of crystallization) and a considerable shift in the crystallization temperature (the transition from a liquid state to a solid state) to higher temperatures were observed as the concentration of COP rose. This behavior was attributed to the differences in the interaction parameters of PEO with THN and COP. The isothermal crystallization kinetics was analyzed on the basis of the Avrami equation. Modified approaches (Avrami and Ozawa) were used for the evaluation of nonisothermal crystallization. In the initial state of crystallization, a power law held true for the augmentation of the radii of spherulites with time for all mixtures, regardless of the concentration of COP. Different spherulitic morphologies were observed, depending on the COP concentration. With rising COP contents, the structures changed from being needlelike to being compact. These findings were all examined in terms of the isothermal variation of the degree of supercooling resulting from changes in the compositions of the mixtures.

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Phase separation studies on poly(vinylidene fluoride) and poly(methyl methacrylate) quenched blends

Cited by 9 publications

References 18 publications

D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

Preparation of oligoamide‐ended poly(ethylene glycol) and hydrogen‐bonding‐assisted formation of aggregates and nanoscale fibers

Crystallization kinetics of poly(ethylene oxide) from its melt and from mixtures with tetrahydronaphthalene and oligo(ethylene oxide‐block‐dimethylsiloxane)

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