Physical and mechanical properties of polypropylene fractions

Schooten, J. van; Hoorn, H. van; Boerma, J. A.

doi:10.1016/0032-3861(61)90020-9

Cited by 45 publications

(8 citation statements)

References 6 publications

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“…The impact strength tends to increase somewhat with molecular weight up to an asymptotic value where the impact strength becomes nearly independent of molecular weight 14. However, the effect of molecular weight seems to be most pronounced with crystalline polymers, such as PP, at temperatures greater than their T g .…”

Section: Resultsmentioning

confidence: 94%

“…The stress–strain properties of crystalline polymers such as polyethylene (PE) and polypropylene (PP) depend upon molecular weight in a manner similar to amorphous polymers 13. 14 However, the dependence upon molecular weight tends to be less apparent because the crystallites help to hold the material together in much the same way as chain entanglements. The molecular weight dependence of certain material properties is further complicated by the decrease in degree of crystallinity as molecular weight increases 13.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

et al. 2001

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

et al. 2001

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“…The size of the crystalline entities depends on the nucleation and crystalline growth rates and these are related to the molar mass and to the chemical regularity of the macromolecules 33. It is possible that the addition of a non‐crystallizable polymer like SAN to PET contributes to the decrease in the regularity of the molecules and reduces the crystallizabillity of PET, reducing the nucleation rate of the blends.…”

Section: Resultsmentioning

confidence: 99%

Non‐isothermal cold crystallization kinetics and morphology of PET + SAN blends

Wellen

Rabello

2009

J of Applied Polymer Sci

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The influence of small amounts of poly(styrene-co-acrylonitrile) (SAN) on the non-isothermal cold crystallization behavior and morphology of poly(ethylene terephthalate) (PET) was investigated by dynamic-mechanical thermal analysis, differential scanning calorimetry (DSC), optical microscopy, and scanning electron microscopy. The results indicated that SAN had a limited solubility in the amorphous phase of PET although in a larger scale a phase separation occurred. The addition of 1 wt % of SAN promoted a significant reduction in the crystallization rate of PET, acting as an antinucleating agent. The kinetics parameters were determined applying both the Ozawa and Mo approaches. Mo's model described the crystallization evolution better than the Ozawa one because it is possible to analyze the kinetic parameters in similar range of crystallinity degrees.

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“…PP-this polymer can be produced in a variety of structures which can be used in a variety of applications, such as compost bins, curbside recycling crates, and laboratory equipment [57]. PP presents some ideal properties, like mechanical properties and the resistance to chemical solvents [13,59]. This material can be recycled by mechanical recycling, which is an easy and cheap method, and also by using the dissolution/reprecipitation technique (direct recycling).…”

Section: Introductionmentioning

confidence: 99%

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

et al. 2019

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Considering that the large quantity of waste electrical and electronic equipment plastics generated annually causes increasing environmental concerns for their recycling and also for preserving of raw material resources, decreasing of energy consumption, or saving the virgin materials used, the present challenge is considered to be the recovery of individual polymers from waste electrical and electronic equipment. This study aims to provide an update of the main identification methods of waste electrical and electronic equipment such as spectroscopic fingerprinting, thermal study, and sample techniques (like identification code and burning test), and the characteristic values in the case of the different analyses of the polymers commonly used in electrical and electronic equipment. Additionally, the quality of the identification is very important, as, depending on this, new materials with suitable properties can be obtained to be used in different industrial applications. The latest research in the field demonstrated that a complete characterization of individual WEEE (Waste Electric and Electronic Equipment) components is important to obtain information on the chemical and physical properties compared to the original polymers and their compounds. The future directions are heading towards reducing the costs by recycling single polymer plastic waste fractions that can replace virgin plastic at a ratio of almost 1:1.

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Physical and mechanical properties of polypropylene fractions

Cited by 45 publications

References 6 publications

Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

Influence of the molecular weight of ethylene vinyl acetate copolymers on the flow and mechanical properties of uncompatibilized polystyrene/ethylene-vinyl acetate copolymer blends

Non‐isothermal cold crystallization kinetics and morphology of PET + SAN blends

Waste Electrical and Electronic Equipment: A Review on the Identification Methods for Polymeric Materials

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