Structure of iPP‐PS composites with specific dispersion of PS component

Κryszewski, M.; Pluta, M.; Trznadel, M.; Milczarek, P.

doi:10.1002/masy.19920620118

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Chichester obtained in this way (PE/PS and PP/PS), are characterized by a specific dispersion of the PS inclusions and that the structure of the semicrystalline polymer matrices is modified to some extent [1][2][3]. The materials obtained in this way exhibited some interesting changes of physical properties compared to those found for the pure polymer matrix.…”

Section: John Wiley and Sons Limitedmentioning

confidence: 96%

Phase structure and viscoelastic properties

Pluta

Morawiec

Κryszewski

et al. 1996

Journal of Thermal Analysis

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The phase structure and dynamic mechanical properties of three polypropylene/polystyrene (PP/PS) systems of similar composition but various dispersion of the minor PS component have been examined. Two different PP/PS systems were prepared by polymerization of styrene (ST) molecularly dispersed in PP matrices (with the same initial structure) under the conditions leading to a linear or erosslinked PS component. The third PP/PS system has been prepared blending the homopolymers in the molten state. Studies of materials containing in situ polymerized PS revealed nanoscale phase separation of PS (atomic force microscopy) and pointed to the presence of physical entanglements between PS and non-crystalline phase of PP (DSC, dynamic mechanical analysis). The PS component in material prepared by melt mixing appeared to be completely phase-separated into micron-sized domains. Dynamic mechanical analysis revealed also the dependence of viscoelastic behavior of the PP/PS systems on dispersion of the PS inclusions and on the nature of the interface.

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Section: John Wiley and Sons Limitedmentioning

confidence: 96%

Phase structure and viscoelastic properties

Pluta

Morawiec

Κryszewski

et al. 1996

Journal of Thermal Analysis

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Graft‐copolymerization of styrene on polypropylene in the solid phase

Beenen

VanderWal

Janssen³

et al. 1996

Macromolecular Symposia

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Abstract:The graft-copolymerization of styrene on PP in the solid phase has been studied under various reaction conditions using a radical initiator. Polymerization kinetics were investigated by DSC experiments and reactions in glass ampoules. The conversion rate and grafting efficiency of styrene appeared to be strongly influenced by the presence of the PP matrix and the styrene/PP ratio. From reactions in a lab scale reactor the concentrations of styrene and initiator, the dosing rate and the temperature were investigated to be critical parameters determining the grafting efficiency and the average length and number of grafts. The phenomena observed were explained by describing the process in relative rates of diffusion and polymerization, including swelling of the polymer by styrene monomer and diffusion limitations (Trommsdorff effect).

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Structure of iPP‐PS composites with specific dispersion of PS component

Cited by 2 publications

References 13 publications

Phase structure and viscoelastic properties

Phase structure and viscoelastic properties

Graft‐copolymerization of styrene on polypropylene in the solid phase

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