Spherulitic crystallization behavior of linear low-density polyethylene

In this study the crystallization behavior of linear low‐density polyethylenes (LLDPEs) (ethylene‐α‐olefin copolymers) was studied by polarized light microscopy. A modified Hoffman‐Lauritzen (MHL) expression is proposed whereby the equilibrium melting temperature, T mH,∞ (T m0), is replaced with the...

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Bibliographic Details
Published in:Polymer engineering and science 2005-01, Vol.45 (1), p.74-83
Main Authors: Feng, L., Kamal, M.R.
Format: Article
Language:English
Subjects:
Applied sciences
Crystallization
Exact sciences and technology
Melting
Organic polymers
Physicochemistry of polymers
Polymerization
Properties and characterization
Resins
Thermoplastic composites
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Summary:In this study the crystallization behavior of linear low‐density polyethylenes (LLDPEs) (ethylene‐α‐olefin copolymers) was studied by polarized light microscopy. A modified Hoffman‐Lauritzen (MHL) expression is proposed whereby the equilibrium melting temperature, T mH,∞ (T m0), is replaced with the melting temperature of the crystal stem is replaced with the maximum possible stem length, T mC,n*. It successfully describes the crystalline spherulitic growth kinetics for both homogeneous and heterogeneous LLDPEs. In addition to regimes III and II, another regime (IM) was found in the high crystallization temperature range. Linear growth behavior of crystalline spherulites was observed in regime III, and nonlinear growth behavior was found in regimes II and IM. The basal surface free energy can be estimated from the short chain branching polydispersity (SCBP) for LLDPEs with excluded comonomers. Polym. Eng. Sci. 45:74–83, 2005. © 2004 Society of Plastics Engineers.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.20231