Polyethylene-polystyrene gradient polymers III. Mechanical and rheo-optical studies of relaxation processes

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

doi:10.1007/bf01412502

Cited by 18 publications

(4 citation statements)

References 19 publications

(32 reference statements)

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“…Recently, gradient structures [ 1,2] and surface segregation [3][4][5] in polymer blends have been reported by many researchers. In a gradient structure, the concentration of one component in the polymer blends gradually changes from the surface (surface in contact with air) to the bottom (surface in contact with substrate).…”

Section: Introductionmentioning

confidence: 99%

Study of factors affecting the formation of a gradient structure in acrylate copolymer/fluoro-copolymer blends

Kano¹,

Inoue²,

Akiba³

et al. 1998

Journal of Adhesion Science and Technology

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The effects of the solution concentration and the rate of solvent evaporation on the formation of gradient structures were examined for poly(2-ethylhexyl acrylate-co-acrylic acid-co-vinyl acetate) [P(2EHA-AA-VAc)]/poly(vinylidene fluoride-co-hexafluoro-acetone) [P(VDF-HFA)] blends. When the 30/70 P(2EHA-AA-VAc)/P(VDF-HFA) blend was prepared from 10 wt% THF solution, a gradient structure was not formed. When the 70/30, 50/50, and 30/70 P(2EHA-AA-VAc)/P(VDF-HFA) blends were prepared by casting from 5 wt% tetrahydrofuran (THF) solution onto poly(tetrafluoroethylene) (PTFE), the chemical compositions of the surface and bottom sides of the blends were different depending on the blend ratio and rate of solvent evaporation. Therefore, it was concluded that the formation of a gradient structure is strongly influenced by the solution concentration and the rate of solvent evaporation.

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Section: Introductionmentioning

confidence: 99%

Study of factors affecting the formation of a gradient structure in acrylate copolymer/fluoro-copolymer blends

Kano¹,

Inoue²,

Akiba³

et al. 1998

Journal of Adhesion Science and Technology

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“…Also, the greater path length of the diffusing molecule through the membrane diminishes the diffusion coefficient. In the case of modified PE films a high porosity and the crystalline phase reordering can make the intraspherulitic transport possible, because as it has been shown in a previous work [6], ST at higher diffusion temperatures TD partially decomposes the radial lamellae in the spherulite resulting in formation of separated blocks of crystallites. Therefore, the useful membranes will be characteristic of the structural features which can be easily obtained upon the process of preparation.…”

Section: Introductionmentioning

confidence: 82%

Morphology influence on the permeation properties of styrene and polystyrene modified polyethylene membranes

Milczarek

Pluta

Κryszewski

1989

Colloid & Polymer Sci

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Influence of the structure of styrene and polystyrene modified PE membranes on their permeation properties is presented. It is demonstrated that the temperature of styrene treatment (N membranes) and the presence of polystyrene (P membranes) results in high differentiation of the permeation properties. SALS studies have shown the structural reorganization depending on modification extent and diffusion of the penetrant. It is also shown that the morphology of the dried films remains unchanged. This work proves that the appropriate modification of PE films results in membranes with controlled permeation behavior.

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“…13 Pursuing mechanical modification, the second monomer diffusion approach, has been used in amorphous 7,8,10,11,13 and crystalline polymers. 14 During polymer processing, gradients in morphology have been formed by annealing compression-molded sheets 15 or by slow crystallization in injection molding. 16 The gradient composition concept has been also applied in small beads prepared by suspension polymerization, to release, in a controlled way, a pharmaceutical drug over a prolonged time, due to the drugdistribution gradient.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of styrene‐butyl acrylate polymers, varying feed composition in a semicontinuous emulsion process

Jasso-Gastinel

López-Ureta

González-Ortiz

et al. 2006

J of Applied Polymer Sci

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Two-stage polymerization has been used to improve properties of two-component polymers. In this work, a semicontinuous emulsion process varying feed composition along the reaction is used to produce copolymer chains of different composition as conversion proceeds. Polymer composition and evidence of branching were determined by 1 H-NMR. Polymer molecular weight values determined by GPC are beyond the range where mechanical properties depend on molecular weight. Mechanodynamic properties show a copolymer type behavior with a synergistic effect around the 50/50 styrene/butyl acrylate composition ratio. For such composition, mechanical performance superiority of variable composition copolymer with respect to two-stage polymer was confirmed with stress-strain tests carried out at several temperatures.

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Polyethylene-polystyrene gradient polymers III. Mechanical and rheo-optical studies of relaxation processes

Cited by 18 publications

References 19 publications

Study of factors affecting the formation of a gradient structure in acrylate copolymer/fluoro-copolymer blends

Study of factors affecting the formation of a gradient structure in acrylate copolymer/fluoro-copolymer blends

Morphology influence on the permeation properties of styrene and polystyrene modified polyethylene membranes

Synthesis and characterization of styrene‐butyl acrylate polymers, varying feed composition in a semicontinuous emulsion process

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