IR spectroscopic investigation of order changes in amorphized polyvinylchloride

Glazkovskii, Yu. V.; Zav'yalov, A.N.; Bakardzhiyev, N.M.; Novak, I. I.

doi:10.1016/0032-3950(70)90492-2

Cited by 7 publications

(1 citation statement)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are also indications in the literature that the noncrystalline portions may exist in various degrees of order with different densities. 44 Density fluctuations associated to different packing degrees in our homopolymer would be the counterpart for concentration fluctuations in blends. It can be expected that regions with different density would show different dynamical behavior.…”

Section: B Heterogeneous Dynamicsmentioning

confidence: 93%

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

Arbe

Moral²,

Alegría

et al. 2002

The Journal of Chemical Physics

View full text Add to dashboard Cite

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.

show abstract

Section: B Heterogeneous Dynamicsmentioning

confidence: 93%

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

Arbe

Moral²,

Alegría

et al. 2002

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

Biaxial orientation of poly(vinyl chloride) compounds: Interaction between drawing, structure, and properties

Gilbert

Liu

Hitt

1997

Polymer Engineering & Sci

View full text Add to dashboard Cite

Rigid poly(viny1 chloride) (PVC) sheets were stretched uniaxially (at constant width), equally biaxially, and unequally biaxially to various draw ratios. Tensile properties, density, and birefringence of the stretched sheets were measured, and their wide angle X-ray diffraction traces recorded. Comparison of results showed the highest crystallite and overall orientation and density in the uniaxial samples, and lowest values for the equal biaxial samples. Drawing resulted in the alignment of some existing crystallites in the plane of the film, together with the formation of new mesomorphous structures. Changes in tensile strength were attributed to overall orientation.

show abstract

Annealing effect on cold drawing of PVC-films

Springer

Burrichter

Hinrichsen

1982

Colloid & Polymer Sci

View full text Add to dashboard Cite

Cold drawing of PVC-films at room temperature depends on thermal pretreatment. Yield stress, difference between yield and draw stress and neck temperature increase, when the samples have been annealed not far below glass transition temperature and subsequently quenched; they decrease by annealing above Tg and quenching down to room temperature. These changes of variables characterizing the cold drawing process can be interpreted morphologically by an increase or decrease of free volume in the noncrystalline regions which favour neck formation or render it more difficult respectively.

show abstract

IR spectroscopic investigation of order changes in amorphized polyvinylchloride

Cited by 7 publications

References 17 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

Biaxial orientation of poly(vinyl chloride) compounds: Interaction between drawing, structure, and properties

Annealing effect on cold drawing of PVC-films

Contact Info

Product

Resources

About