INVESTIGADORES
GALANTE Maria Jose
artículos
Título:
The Crystallization of Blends of Different Type Polyethylenes: The Role of Crystallization Conditions
Autor/es:
M.J .GALANTE; L. MANDELKERN; R. ALAMO
Revista:
POLYMER
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 1997 vol. 39 p. 5105 - 5119
ISSN:
0032-3861
Resumen:
Co
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key f
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
actor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
crystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcool
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
ing
crystalliza
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
tion conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethy
Cocrystallization in blends of linear and branched polyethylenes has been studied under both isothermal and slowcooling
crystallization conditions. Before the more common, polydisperse-type polyethylenes were studied and
the results analysed, model systems were investigated in detail. The components used in the model binary blends
were molecular weight fractions of linear polyethylene, hydrogenated poly(butadiene) as a model for the ethylene-
1-alkene copolymers, and a three-arm star hydrogenated poly(butadiene) as a model for the long chain branched
polyethylenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.
lenes. It was found that a key factor in governing the extent of cocrystallization in these blends is the
closeness of crystallization rates of each of the components. The extent of the cocrystallization thus diminishes
with increasing concentration of the linear component in the blend. It is found that copolymer composition and
molecular structure also have a strong influence on cocrystallization. The amount of cocrystallization is favoured
at the lowest isothermal crystallization temperatures and is maximized under quenching conditions. The general
features that influence cocrystallization, which have evolved from this study, are discussed.