The Effect of Molecular Weight on the Melting Temperature and Fusion of Polyethylene<sup>1</sup>

Fatou, J. G.; Mandelkern, L.

doi:10.1021/j100886a010

Cited by 172 publications

(53 citation statements)

References 1 publication

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“…Fibre 5 illustrates the plot of Hp as a function of (yp}-for a series of chain-folded and short-chain branched polyethylenes and n-paraffins. The plot shows an excellent (27) agreement with the calculated values according to equation (30) if one uses for bl a value of bl = 20 nm. This value of bl only applies for samples crystallized at atmospheric pressure [26].…”

Section: Hardness Data For Different Lamellar Systemssupporting

confidence: 65%

“…Correlation of micro-hardness and plastic modulus. The solid lines were obtained using equations (16), (17) and (25), (30). The parameter used are given in table 3.…”

Section: The Role Of the Non-homogeneous Microphase Relating To The Ementioning

confidence: 99%

“…Figure 11 illustrates the experimental relationship obtained between E and H [15,18] for chain-folded and branched polyethylenes. The solid line Co in figure 11 is straightforwardly derived from equations (5), (20), (21), (25) and (30) by using the parameters listed in table 2.…”

Section: The Role Of the Non-homogeneous Microphase Relating To The Ementioning

confidence: 99%

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A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

Baltá-Calleja

Kilian

1985

Colloid & Polymer Sci

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An analysis of micro-hardness and elastic modulus data for different iamellar systems in the light of both eutectoid copolymer and chain folded Iamellar microphases is presented. A novel thermodynamically derived expression offering a fair description of hardness (stress required to plastically deform a crystal) of autonomous non-homogeneous microphases in terms of the average crystal thickness, including a defective surface boundary is developed. The present results characterize the mechansim of plastic deformation as primarily governed by the initial mosaic-block structure controlling the "solid state" mechanism underlined. The average dimensions of the remaining blocks after crystal destruction are thus related to the original block dimensions before plastic deformation. Within this context it is shown that the dissipated energy for crystal destruction increases very rapidly with the molar mass-function of crystalline material.The elastic deformation of these lamellar systems at small strains is correlated to the rubber-like behaviour of the cluster-network. Finally, the role of the average thickness of the non-homogeneous microcrystallites is stressed as describing concurrently the elastic and plastics properties of the polymer allowing a quantitative description of the correlation found between micro-hardness and elastic modulus.

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Section: Hardness Data For Different Lamellar Systemssupporting

confidence: 65%

“…Correlation of micro-hardness and plastic modulus. The solid lines were obtained using equations (16), (17) and (25), (30). The parameter used are given in table 3.…”

Section: The Role Of the Non-homogeneous Microphase Relating To The Ementioning

confidence: 99%

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A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

Baltá-Calleja

Kilian

1985

Colloid & Polymer Sci

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“…Smooth curves, too, have been found for fractionated linear polyethylene (24,25,26) ; with only small curvature TIn(M) approaches its asymptotic value. Hence, in the case of solution-grown PP crystals, there must be some phenomenon which causes a melting point depression for low molecular weights, decreasing with increasing molecular weight.…”

Section: The Molecular Weight Dependencementioning

confidence: 95%

Dilatometric study on the melting of polypropylene at elevated pressure

Leute

Dollbopf

Liska

1978

Colloid Polymer Sci

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“…That means that the amount of non-interlamellar amorphous phase (inter spherulitic amorphous phase) increases with the molecular weight. This is obviously relevant to the observation that the perfection of the spherulitic structure decreases with the molecular weight [28,35,48,51].…”

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confidence: 93%

Crystallization of quenched polyethylene. Part III : Mixtures of fractions

Rault

Robelin²

1982

J. Phys. France

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Abstract. 2014 The crystallization of mixtures of P.E. fractions quenched from the melt has been studied by SAXS, WAXS and DTA. The laws of variation of the long period with the weight and number average molecular weights are given. It is shown that the long period, L, of the semi-crystalline state is given by the weight average of the end-to-end distance rw of the coils in the liquid state before quenching. For mixtures containing high molecular weight M > M* = 105, the long chains behave like a series of segments of chains of molecular weight M* which crystallize independently. The crystallinity measured by WAXS and DTA varies with the molecular weight and its distribution as the linear crystallinity lc/L ~ lc/rw where lc is the crystalline lamella thickness and is independent of the molecular weight. The correlations emphasized in this paper between the solid and melt states of P.E. support the contention that the structure of lamellar semi-crystalline P.E. is not controlled by the phenomenon of secondary nucleation, but by the dimensions and the rigidity of the coils just before crystallization. The results reported in this paper show that the process of crystallization of short and long chains are different ; that would explain the differences observed in studies of the kinetics of crystallization, and in the morphology of the semicrystalline state when the molecular weight is increased.

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The Effect of Molecular Weight on the Melting Temperature and Fusion of Polyethylene¹

Cited by 172 publications

References 1 publication

A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

Dilatometric study on the melting of polypropylene at elevated pressure

Crystallization of quenched polyethylene. Part III : Mixtures of fractions

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The Effect of Molecular Weight on the Melting Temperature and Fusion of Polyethylene1

Cited by 172 publications

References 1 publication

A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

A novel concept in describing elastic and plastic properties of semicrystalline polymers: polyethylene

Dilatometric study on the melting of polypropylene at elevated pressure

Crystallization of quenched polyethylene. Part III : Mixtures of fractions

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Product

Resources

About

The Effect of Molecular Weight on the Melting Temperature and Fusion of Polyethylene¹