Effect of intra-chain double bonds on the crystallization of polyethylene from the melt

Amelino, L.; Martuscelli, E.

doi:10.1016/0032-3861(75)90204-9

Polymer

1975

DOI: 10.1016/0032-3861(75)90204-9

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Effect of intra-chain double bonds on the crystallization of polyethylene from the melt

L. Amelino¹,

E. Martuscelli²

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1978

1980

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Cited by 17 publications

References 7 publications

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Ethylene‐butadiene copolymers, 2. Long branching, double bond distribution and their effect on polymer properties

1978

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The principal structural characteristics of ethylene-butadiene copolymers prepared with a modified vanadium catalyst are described. The distribution of the butadiene monomeric units, though non-random, is sufficiently homogeneous at low monomeric units content of butadiene (1-3 mole-%) that a ready and efficient vulcanization with sulfur based systems is easily achieved.Long chain branching, which has a detrimental effect on the copolymer properties, can be measured rheologically and controlled at a very low level by the catalyst system. Vulcanized ethylene-butadiene copolymers show improved mechanical properties with respect to high density polyethylene and good processability before curing.

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Ethylene‐butadiene copolymers, 2. Long branching, double bond distribution and their effect on polymer properties

1978

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Properties of solution grown crystals of aliphatic polyesters with variable amount of double bonds along the chain

Crispino¹,

Maglio²,

Martuscelli³

et al. 1979

Makromol. Chem.

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In order to elucidate the relations between morphological habits, thermal behaviour and chemical structure of polymers, aliphatic polyesters with variable amout of frans-double bonds along the backbone chain were crystallized from dilute solutions in 1-propanol and I-hutanol. The crystals were studied with electron microscopy, differential scanning calorimetry, and wide angle X-ray diffraction. The morphology of solution grown single crystals and some thermodynamic quantities such as the equilibrium dissolution and melting temperature and the enthalpy and entropy of fusion are influenced by the percentage of unsaturated comonomer. The thermal behaviour and the X-ray diffraction of these crystals suggest that saturated and unsaturated repeating units are able to cocrystallize.

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Properties of polyethylene‐polypropylene blends: Crystallization behavior

Martuscelli¹,

Pracellà²,

Avella³

et al. 1980

Makromol. Chem.

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The crystallization behavior of high density polyethylene/isotactic polypropylene blends (HDPE/PP) was investigated. The overall kinetics of crystallization of HDPE may be strongly influenced by the addition of a small fraction of PP. At 398 K the half crystallization time of the blend containing 10% by weight of P P is around three times larger than for pure polyethylene. This effect may be accounted for by an increase in the melt viscosity of liquid HDPE caused by PP molecules. For crystallization temperatures high enough to prevent HDPE crystallization (T, > 400 K), the presence in the melted blends of liquid HDPE influences the crystallization of PP. In fact, the half time of crystallization of P P increases with increasing the fraction of HDPE in the blend. The kinetics show a minimum at a well defined composition (around 60% in PP) before phase inversion. The same trend is observed when the surface free energy of folding and the lamellar thickness of crystals are reported as function of composition.

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Effect of intra-chain double bonds on the crystallization of polyethylene from the melt

Cited by 17 publications

References 7 publications

Ethylene‐butadiene copolymers, 2. Long branching, double bond distribution and their effect on polymer properties

Ethylene‐butadiene copolymers, 2. Long branching, double bond distribution and their effect on polymer properties

Properties of solution grown crystals of aliphatic polyesters with variable amount of double bonds along the chain

Properties of polyethylene‐polypropylene blends: Crystallization behavior

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