Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Dynamic mechanical analysis of ethylene/1-hexene copolymers : The effect of the catalyst type on the short-chain branching distribution and properties of the amorphous and crystalline phases. / Shundrina, Inna K.; Matsko, Mikhail A.; Baskakova, Kseniya I. и др.
в: Journal of Applied Polymer Science, Том 134, № 14, 44638, 10.04.2017.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Dynamic mechanical analysis of ethylene/1-hexene copolymers
T2 - The effect of the catalyst type on the short-chain branching distribution and properties of the amorphous and crystalline phases
AU - Shundrina, Inna K.
AU - Matsko, Mikhail A.
AU - Baskakova, Kseniya I.
AU - Echevskaya, Ludmila G.
AU - Nikolaeva, Marina I.
AU - Shundrin, Leonid A.
AU - Zakharov, Vladimir A.
N1 - Publisher Copyright: © 2016 Wiley Periodicals, Inc.
PY - 2017/4/10
Y1 - 2017/4/10
N2 - Dynamic mechanical analysis was used to study ethylene/1-hexene copolymers with different compositions, molecular weight distributions, and profiles of short-chain branching (SCB) versus molecular weight. These copolymers were produced over a highly active supported titanium–magnesium catalyst (TMC), a highly active supported vanadium–magnesium catalysts (VMC), and a supported zirconocene catalyst. A higher fraction of the crystalline phase in the copolymers prepared with VMC was shown to result in higher elastic modulus values. β relaxation was found to be sensitive to the SCB distribution versus the molecular weight. The copolymers prepared with the zirconocene catalyst and VMC were characterized by more uniform SCB distributions and higher temperatures of β relaxation compared to the copolymers prepared with TMC. The mobility of the polymer chains at room temperature in the amorphous phase obtained by the spin-probe method rose with increasing branch content in the copolymers and was not sensitive to different SCB distribution profiles.
AB - Dynamic mechanical analysis was used to study ethylene/1-hexene copolymers with different compositions, molecular weight distributions, and profiles of short-chain branching (SCB) versus molecular weight. These copolymers were produced over a highly active supported titanium–magnesium catalyst (TMC), a highly active supported vanadium–magnesium catalysts (VMC), and a supported zirconocene catalyst. A higher fraction of the crystalline phase in the copolymers prepared with VMC was shown to result in higher elastic modulus values. β relaxation was found to be sensitive to the SCB distribution versus the molecular weight. The copolymers prepared with the zirconocene catalyst and VMC were characterized by more uniform SCB distributions and higher temperatures of β relaxation compared to the copolymers prepared with TMC. The mobility of the polymer chains at room temperature in the amorphous phase obtained by the spin-probe method rose with increasing branch content in the copolymers and was not sensitive to different SCB distribution profiles.
KW - catalysts
KW - mechanical properties
KW - polyolefins
KW - structure–property relationships
KW - thermal properties
KW - MELTING BEHAVIOR
KW - LOW-DENSITY POLYETHYLENE
KW - MOLECULAR-WEIGHT
KW - POLYMERIZATION
KW - structure-property relationships
KW - CALIBRATION COEFFICIENT
KW - CO-POLYMERS
KW - ZIEGLER-NATTA CATALYSTS
KW - ETHYLENE/ALPHA-OLEFIN COPOLYMERS
KW - METALLOCENE
KW - HEAT-FLOW DSC
UR - http://www.scopus.com/inward/record.url?scp=85007360527&partnerID=8YFLogxK
U2 - 10.1002/app.44638
DO - 10.1002/app.44638
M3 - Article
AN - SCOPUS:85007360527
VL - 134
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
SN - 0021-8995
IS - 14
M1 - 44638
ER -
ID: 9056906