Crystallinity in Poly(vinyl Chloride)

Gilbert, Marianne

doi:10.1080/15321799408009633

Cited by 62 publications

(18 citation statements)

References 139 publications

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“…For both reasons, a large number of studies on the structure and dynamics of PVC can be found in the literature. 1,2 The nature of this polymer has revealed to be so particular that even books have been devoted to it. 2 Despite the big effort made, some of its peculiarities-well established since many years-are not yet understood.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Arbe

Moral²,

Alegría

et al. 2002

The Journal of Chemical Physics

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Study of the structure and dynamics of poly(vinyl pyrrolidone) by molecular dynamics simulations validated by quasielastic neutron scattering and x-ray diffraction experiments J. Chem. Phys. 134, 054904 (2011); 10.1063/1.3533771 Short-range order and collective dynamics of poly(vinyl acetate): A combined study by neutron scattering and molecular dynamics simulations Comparative study of the relaxation behavior at very low frequencies of acrylate polymers with pendant 1,3dioxane rings in their structureWe have investigated the thermal evolution of the structure and the dynamics of poly͑vinyl chloride͒ ͑PVC͒ in a wide temperature range. Corroborating earlier findings, small angle neutron scattering revealed the presence of structural heterogeneities. On the other hand, the single chain form factor corresponds to that of Gaussian chains. Gradually with increasing temperature the system becomes homogeneous. A simple description of the heterogeneities in terms of microcrystallites is forwarded. The dynamical behavior of PVC has been investigated combining broadband dielectric spectroscopy ͑DS͒ with coherent and incoherent neutron scattering. In a wide temperature range broadband DS facilitated a precise determination of the dynamic response related to the segmental relaxation. Close to the glass transition temperature the line shape strongly deviates from the usual Kohlrausch-Williams-Watts functional form of common glassforming systems. Moreover, the characteristic relaxation time observed by incoherent scattering displays an anomalous dependence on momentum transfer indicating the possible existence of heterogeneities in the sample. Based on the structural and dynamical results, a model is proposed, that considers the coexistence of regions with different dynamical properties leading to a distribution of characteristic relaxation times. The model accounts for the experimental observations, assuming for all regions the same functional form for the ␣-relaxation. It may be univocally determined from the coherent scattering data at the first static structure peak. The distribution of relaxation times found is compatible with the distribution of only one variable, the glass transition temperature.

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Section: Introductionmentioning

confidence: 99%

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Arbe

Moral²,

Alegría

et al. 2002

The Journal of Chemical Physics

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“…Because of their high ionic conductivity, gel electrolytes have attained precedence over conventional polymer electrolyte. In recent years, polymers such as polyvinyl alcohol (PVA), poly(vinylidene fluoride) (PVdF), polyethylene glycol (PEG), poly(vinylchloride) (PVC), poly(acrylonitrile) (PAN), poly(vinylpyrrolidone)(PVP) and poly(vinyl sulfone) (PVS) have been prominently used in development of gel polymer electrolytes 1,[3][4][5] . These electrolytes have been found to posses ionic conductivity, electrochemical stability and transport properties similar to their liquid counterpart along with better dynamical properties suitable for electrochemical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Polymer electrolytes have become material of great importance for use in different electrochemical devices due to their unique characteristics such as easy mouldabality, good electrode -electrolyte contact and light weight 1,2 . These polymer electrolytes form a bridge between liquid electrolyte and polymer.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of PVA Based Gel Electrolyte

Bhad¹,

Sangawar²

2012

Chem Sci Trans

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An attempt has been made to prepare polyvinyl alcohol (PVA) based proton conducting gel electrolytes in ammonium thiocyanate (NH 4 SCN) solution and to characterize them. XRD studies revealed that the entire gel sample are amorphous in nature with a broad peak at nearly 2θ=22 0 . Variation of conductivity of gel electrolyte with loading concentration of PVA has also been studied. It has been observed, as loading of PVA in 0.2 M electrolyte of NH 4 SCN+DMSO increases conductivity decreases. The conductivity of gel electrolytes exhibits liquid like nature at low polymer concentration while the behaviour is seen to be affected by the formation of PVA-NH 4 SCN complexes upon increase in polymer content beyond 2 g. Temperature dependence of ionic conductivity exhibits VTF and Arrhenius behaviour.

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“…The intense and broad absorption peak related to CH 2 rocking vibration at 874 cm -1 show the presence of head to head and tail to tail configuration but the intensity of this peak enhances after the addition of salt, indicating strong salt polymer interaction. Addition of NH 4 (Figure 3) to assess the morphology of gel electrolyte. In pure PVdF film (Figure 3(a)), several pores with a lamellar distribution of poly crystalline domain and traces of two polymorphic phases (and are observed and reported elsewhere [20].…”

Section: Resultsmentioning

confidence: 99%

“…The solvent helps in the dissolution of salt and provides the medium for ion conduction. In recent years, polymers such as polyvinyl alcohol (PVA) poly (vinylidene fluoride) (PVdF), Poly ethylene glycol (PEG), poly(vinyl chloride) (PVC), poly(acrylonitrile) (PAN), poly(vinyl pyrrolidone) (PVP) and poly(vinyl sulfone) (PVS) have been prominently used in development of GPEs [3][4][5][6]. These electrolytes have been found to possess ionic conductivity, electrochemical stability and transport properties similar to their liquid counter parts along with better dynamical properties suitable for electrochemical applications.…”

Section: Introductionmentioning

confidence: 99%

Structural and Ion Transport Studies in (100-x) PVdF + xNH<sub>4</sub>SCN Gel Electrolyte

Pandey¹,

Dwivedi²,

Asthana³

et al. 2011

MSA

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Crystallinity in Poly(vinyl Chloride)

Cited by 62 publications

References 139 publications

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Synthesis and Study of PVA Based Gel Electrolyte

Structural and Ion Transport Studies in (100-x) PVdF + xNH<sub>4</sub>SCN Gel Electrolyte

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Crystallinity in Poly(vinyl Chloride)

Cited by 62 publications

References 139 publications

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Heterogeneous structure of poly(vinyl chloride) as the origin of anomalous dynamical behavior

Synthesis and Study of PVA Based Gel Electrolyte

Structural and Ion Transport Studies in (100-x) PVdF + xNH&lt;sub&gt;4&lt;/sub&gt;SCN Gel Electrolyte

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Product

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Structural and Ion Transport Studies in (100-x) PVdF + xNH<sub>4</sub>SCN Gel Electrolyte