Miscibility of isotactic polypropylene with atactic polystyrene

Mucha, Maria

doi:10.1007/bf01410636

Cited by 21 publications

(22 citation statements)

References 23 publications

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“…From the fact that the T c of PP decreased in the machine direction (MD) of the flexural specby PS blending, it was assumed that there was imen was measured with a micrometer and mold an interaction between PP and PS as reported by shrinkage was calculated by the following equaMucha. 23 The decrease of DH c by PS blending was tion: slightly lower than the theoretical value.…”

Section: Measurement Of Propertiesmentioning

confidence: 63%

“…18,19 studied the melt spinning of PP/PS blends markedly decrease. Mucha 23 presumed that there and reported on the morphology and formation is an interaction between PP and PS because the mechanism of ultrafine fibrils 18 and their orientaglass transition temperature of PS increases and tion behavior and mechanical properties. 19 They the glass transition temperature and melting point of PP decrease when PS is blended with PP.…”

Section: Introductionmentioning

confidence: 98%

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Structure and properties of injection moldings of polypropylene/polystyrene blends

Fujiyama

1997

J. Appl. Polym. Sci.

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A homoisotactic polypropylene (PP) was melt blended with 0-30 wt % of three kinds of polystyrene (PS) with melt flow indexes lower than, similar to, and higher than that of PP. The blends were injection molded at cylinder temperatures of 200-280ЊC, and the structure and properties of the injection moldings were studied. With PS blending, although the PP molding whitened, no surface defect such as layer peeling and pearl-like appearance occurred. The rigidity and dimensional accuracy of the molding improved without much deterioration in impact strength and heat resistance. At the same time the fluidity also improved. The injection moldings of PP/PS blends did not show clear skin/core structure under a polarizing microscope. The degrees of crystallinity and crystalline c-axis orientation decreased with PS blending. PS particles were the smallest when the ratio of the viscosity of the PS to that of PP at molding shear rate was slightly lower than unity.

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Section: Measurement Of Propertiesmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 98%

Structure and properties of injection moldings of polypropylene/polystyrene blends

Fujiyama

1997

J. Appl. Polym. Sci.

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“…Using a fracture mechanics approach, the K c value was calculated from the slope of plots of P/BW vs. 1/YЉ, and forced through the origin to 1 under the same testing conditions as the notched specimens. Thermal and mechanical properties for the blends produced with the mild mixing screw are summarized in Table II.…”

Section: Fracture Toughness Measurementmentioning

confidence: 99%

“…In polymer blends where at least one component is crystallizable, the presence of the other component can have significant influence on its melting and crystallization temperatures, crystallite growth rate, and crystallinity. Particularly [1][2][3][4][5][6] with incompatible blends, several phenomena, such as induction of specific crystal modifications, rejec- 7 tion, engulfment, nucleation at the interface, and [8][9][10] deformation of the dispersed component by the growing spherulites of the matrix material have 8,11 been reported. For the case of PP/PS blends, several authors have concluded that there is a specific interaction between PP and PS at their interface in spite of their very low level of miscibility.…”

Section: Introductionmentioning

confidence: 99%

“…For the case of PP/PS blends, several authors have concluded that there is a specific interaction between PP and PS at their interface in spite of their very low level of miscibility. 1,12,13 Thermal analysis has been used to study the miscibility of polymers in blends. For example, the merging of two glass transition temperatures or depression of melting temperature is interpreted as evidence of miscibility.…”

Section: Introductionmentioning

confidence: 99%

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Compatibilization of polypropylene-polystyrene blends: Part 2, crystallization behavior and mechanical properties

Adewole¹,

DeNicola²,

Gogos³

et al. 2000

Adv. Polym. Technol.

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Reactor produced blends of polypropylene (PP) and polystyrene (PS) are obtained by graft copolymerization of styrene onto polypropylene chains. This technique generates simultaneously a graft copolymer (PP‐g‐PS) and polystyrene homopolymer. The resulting blends, however, have a low impact resistance and have to be modified with the addition of rubbery toughening agents, such as an ethylene propylene copolymer (EPR) or a styrene‐b‐ethylene‐alt‐butylene‐b‐styrene (SEBS) triblock copolymer, in a downstream compounding operation. Part 1 of this work, which has been accepted for publication in the British Journal “Plastics, Rubber, and Composites”, was concerned with the compatibilization efficiency and the effect of mixing intensity on the morphological and rheological properties. Part 2 of the study deals with interactions of the components of the blends. These interactions were assessed by monitoring the crystallization behavior and mechanical properties. Mixing experiments were conducted on a proprietary twin screw mixing element evaluator (TSMEE) and also on a commercial TSE‐30 extruder. Differential scanning calorimetry (DSC) was used to determine the transition temperatures and the crystallinity of the blends specimens after annealing. The results show that both the free polystyrene and the graft copolymer, PP‐g‐PS, act as nucleators for the polypropylene phase, thus increasing both the degree of crystallinity and the crystallization temperature of the blends. While a good correlation was found between modulus and crystallinity, the factors affecting fracture behavior were less clearly discernible. © 2000 John Wiley & Sons, Inc. Adv Polym Techn 19: 180–193, 2000

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Compatibilization of polypropylene–polystyrene blends: Part 2, crystallization behavior and mechanical properties

Adewole

DeNicola

Gogos

et al. 2000

Adv. Polym. Technol.

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Reactor produced blends of polypropylene (PP) and polystyrene (PS) are obtained by graft copolymerization of styrene onto polypropylene chains. This technique generates simultaneously a graft copolymer (PP-g-PS) and polystyrene homopolymer. The resulting blends, however, have a low impact resistance and have to be modified with the addition of rubbery toughening agents, such as an ethylene propylene copolymer (EPR) or a styrene-b-ethylene-alt-butylene-b-styrene (SEBS) triblock copolymer, in a downstream compounding operation. Part 1 of this work, which has been accepted for publication in the British Journal "Plastics, Rubber, and Composites", was concerned with the compatibilization efficiency and the effect of mixing intensity on the morphological and rheological properties. Part 2 of the study deals with interactions of the components of the blends. These interactions were assessed by monitoring the crystallization behavior and mechanical properties. Mixing experiments were conducted on a proprietary twin screw mixing element evaluator (TSMEE) and also on a commercial TSE-30Correspondence to: Akin Adewole. COMPATIBILIZATION OF POLYPROPYLENE -POLYSTYRENE BLENDSextruder. Differential scanning calorimetry (DSC) was used to determine the transition temperatures and the crystallinity of the blends specimens after annealing. The results show that both the free polystyrene and the graft copolymer, PP-g-PS, act as nucleators for the polypropylene phase, thus increasing both the degree of crystallinity and the crystallization temperature of the blends. While a good correlation was found between modulus and crystallinity, the factors affecting fracture behavior were less clearly discernible.

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Miscibility of isotactic polypropylene with atactic polystyrene

Cited by 21 publications

References 23 publications

Structure and properties of injection moldings of polypropylene/polystyrene blends

Structure and properties of injection moldings of polypropylene/polystyrene blends

Compatibilization of polypropylene-polystyrene blends: Part 2, crystallization behavior and mechanical properties

Compatibilization of polypropylene–polystyrene blends: Part 2, crystallization behavior and mechanical properties

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