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Macromolecules
Volumn 41, Issue 5, 2008, Pages 1693-1704
Effect of the distribution of short-chain branches on crystallization kinetics and mechanical properties of high-density polyethylene
Author keywords

[No Author keywords available]
Indexed keywords

BIMODAL BLENDS; CRYSTALLIZATION TEMPERATURES; SHORT-CHAIN BRANCHES;
EID: 41849091166     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma070454h     Document Type: Article
Times cited : (127)
References (96)
  • 4
    • 41849087596 scopus 로고    scopus 로고
    • Bailey, F. W.; Whitte, W. M. United States Patent 4,461,873, 1984; United States Patent 4,547,551, 1985.
    • Bailey, F. W.; Whitte, W. M. United States Patent 4,461,873, 1984; United States Patent 4,547,551, 1985.
  • 26
    • 0030373802 scopus 로고    scopus 로고
    • Janzen, J.; Register, D. F. Proc. SPE ANTEC 1996, 2, 2190.
    • Janzen, J.; Register, D. F. Proc. SPE ANTEC 1996, 2, 2190.
  • 59
    • 0142122430 scopus 로고    scopus 로고
    • Melt Theological characterization of metallocene-catalyzed polyethylenes
    • Scheirs, J, Kaminsky, W, Eds, John Wiley & Sons: New York
    • Rohlfing, D. C.; Janzen, J. Melt Theological characterization of metallocene-catalyzed polyethylenes. In Metallocene-Based Polyolefins; Scheirs, J., Kaminsky, W., Eds.; John Wiley & Sons: New York, 2000; p 419.
    • (2000) Metallocene-Based Polyolefins , pp. 419
    • Rohlfing, D.C.1    Janzen, J.2
  • 64
    • 0015034365 scopus 로고
    • Ozawa, T. Polymer 1971, 12, 150.
    • (1971) Polymer , vol.12 , pp. 150
    • Ozawa, T.1
  • 66
  • 67
    • 0022107271 scopus 로고
    • Boyd, R. H. Polymer 1985, 26, 1123.
    • (1985) Polymer , vol.26 , pp. 1123
    • Boyd, R.H.1
  • 76
  • 78
    • 33749473892 scopus 로고    scopus 로고
    • Krishnaswamy, R. K.; Leevers, P. S.; Lamborn, M. J.; Sukhadia, A. M.; Register, D. F.; Maeger, P. L. Polym. Eng. Sci. 2006, 46, 1358.
    • Krishnaswamy, R. K.; Leevers, P. S.; Lamborn, M. J.; Sukhadia, A. M.; Register, D. F.; Maeger, P. L. Polym. Eng. Sci. 2006, 46, 1358.
  • 91
    • 41849099519 scopus 로고    scopus 로고
    • Linear growth velocity, G, was estimated from literature values. For S we interpolated between G for linear 31K52 and 75K.59,60 For L we extrapolated from G for linear PE of 100K, 210K, and 266K.57-59 The effects of SCB on G are much stronger than those of Mw Therefore, G of Sb was estimated to be very similar to a 60K PE with ∼ 4 SCB/1000 BC (57, 58, Finally, G for Lb was extrapolated from the dependence of linear growth rate with Mw for copolymers of similar short chain branching 60K with 4 SCB/1000 BC and 117K with 5.5 SCB/1000 BC, refs 87 and 88, The temperature dependence of G was used for estimations when data was available close to but not exactly at the temperature of interest. The estimated values are approximate; however, their order of magnitude is such that small variations would not change our discussion
    • w for copolymers of similar short chain branching (60K with 4 SCB/1000 BC and 117K with 5.5 SCB/1000 BC, refs 87 and 88). The temperature dependence of G was used for estimations when data was available close to but not exactly at the temperature of interest. The estimated values are approximate; however, their order of magnitude is such that small variations would not change our discussion.
  • 95
    • 41849091033 scopus 로고    scopus 로고
    • Although literature values for HDPE are sparse and refer to samples with a certain degree of polydispersity,92 values for the diffusivity of (model) hydrogenated polybutadienes are available at 175°C as a function of molecular weight.93.94 The temperature dependence has been described to fit well with an Arrhenius type expression with activation energy of 26 kJ/mol, allowing calculation of diffusivity at 125°C Also, note that in a blend, the diffusivity of short molecules is negligibly affected by the presence of the long molecules since they tend to reduce any constraint release that may have been operative in the unimodal case, For the L chain lengths used here, the diffusivity of the long chains also retains the value that it has in a unimodal melt despite the presence of the short chains: the ratio of molecular weights is such that it is known that constraint release does not dominate the diffusion of the long chains.96
    • 96.

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