Calorimetric study of first order transitions in poly(vinyl chloride)

Juijn, J. A.; Gisolf, Janneke; Jong, W.A. De

doi:10.1007/bf01542521

Cited by 37 publications

(14 citation statements)

References 14 publications

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“…Superposition of the data suggest that the nature of the polymer into which sorption occurs is the same irrespective of TB. In other words, it is not affected by the presence of secondary crystallinity, which is known to be produced on This supports the earlier suggestion of Juijn et al 14 and subsequent thermal analysis measurements that recrystallization from a PVC melt produces a leas ordered structure than the primary crystallinity present in the virgin polymer.…”

Section: Solvent Sorptionsupporting

confidence: 82%

Crystallinity changes during PVC processing

Obande¹,

Gilbert²

1989

J of Applied Polymer Sci

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SynopsisThermal analysis, solvent sorption, density measurement, and X-ray diffraction techniques were used to investigate structural changes in a variety of PVC compounds which were extruded or compression-molded at temperatures in the range 150-220OC. In all cases processing at lower temperatures in this range resulted in a disappearance of primary crystallinity and a concomitant development of secondary crystallinity, of lower order. In many cases processing above 190-200"C caused a small increase in crystallinity. It is believed that this is more ordered secondary crystallinity, which is therefore detectable by X-ray diffraction and also capable of influencing density and solvent sorption behavior. The observed structural behavior depends on shear as well as temperature. Primary crystallinity is higher in compression moldings, which have experienced lower shear levels, and the increase in crystallinity at higher temperatures is also greater.Equilibrium solvent sorption depends on the presence of primary and ordered secondary crystallinity. D i W o n is, however, unaffected as it occurs through amorphous and disordered crystalline regions only.

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Section: Solvent Sorptionsupporting

confidence: 82%

Crystallinity changes during PVC processing

Obande¹,

Gilbert²

1989

J of Applied Polymer Sci

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“…The same table includes data obtained from DEHP-PVC samples prepared and annealed under identical conditions but with PVC of higher molecular weight (A~¢, = 170.000). The calculated values of degree of crystallinity of table 1 and subsequent tables were obtained by comparison with the value of AH ° = 10.5 + 1.0 cal/g in this work, which compares favorably to the values of 10.5 cal/g determined by Anagnostopoulos et al [37] and 12.0 cal/g determined by Juijn et al [30]. Other values of AH ° have been reported by Grewer and Wilski [27,28].…”

Section: Tm T ° Ah2mentioning

confidence: 54%

“…To study phenomena related to thermodynamic compatibility and one-phase system formation, we used a combination of thermal and mechanical experiments in much a similar way to that reported by Juijn et al [30] and Leharne et al [31]. In addition, it was an objective of this research to establish within what limits the theory of rubbery elasticity could be applied to microcrystalline polymer-diluent systems, especially plasticized PVC, and how chain entanglements could affect the physical behavior of these systems.…”

Section: Introductionmentioning

confidence: 97%

Microcrystalline and three-dimensional network structure of plasticized poly(vinyl chloride)

Patterson

Padgett

Peppas

1982

Colloid & Polymer Sci

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Three-dimensional networks can be formed in plasticized poly(vinyl chloride) by chain entanglements and crystallites introduced in the system during the fusion and annealing processes. The fusion conditions influence the mechanical stability of the plasticized polymers, by establishing regions where one-phase systems are observed. During annealing at temperatures of between 170 and 190 ~ for up to 9 minutes, maximum degree of crystallinity of 0.079 was detected for samples plasticized with 20 wt% di-2-ethyl-hexyl-phthalate. Experimental analysis of mechanical properties and analysis of stress relaxation experiments showed that rubber elasticity theories could be applied with some approximation to plasticized PVC to analyze the structure of the three-dimensional networks formed.

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“…This behaviour is in general shown for the development of physical and chemical networks. That the crosslinks in PVC gels are tiny crystallites was proven with the aid of X-ray diffraction [9][10][11][12] and by model calculations [13][14][15]. In the work of Dorrestijn et al…”

Section: Examples A) Crystallisationmentioning

confidence: 99%

On the nature of crosslinks in thermoreversible gels

2006

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SummaryA review is given concerning the nature of crosslinks in thermoreversible gels. In these gels the crosslinks can be formed e.g. by means of crystallisation of parts of polymer molecules, by liquid-liquid phase separation in solution and in bulk, by hydrogen bridging, by complexation of polymer chains, by helix formation, by chemical equilibrium reaction or by interactions between side-chains. One example will be given for each of these eight possibilities of crosslink formation.

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Calorimetric study of first order transitions in poly(vinyl chloride)

Cited by 37 publications

References 14 publications

Crystallinity changes during PVC processing

Crystallinity changes during PVC processing

Microcrystalline and three-dimensional network structure of plasticized poly(vinyl chloride)

On the nature of crosslinks in thermoreversible gels

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