Analysis of the chemical composition distribution of ethylene/α-olefin copolymers by solution differential scanning calorimetry: an alternative technique to Crystaf

Sarzotti, Deborah M.; Soares, João B. P.; Simon, Leonardo C.; Britto, L. J. D.

doi:10.1016/j.polymer.2004.04.072

Cited by 32 publications

(44 citation statements)

References 41 publications

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“…Ultimate mechanical properties and crack resistance improve as the length of the side branch increases, possibly because SCB influences morphology and tie-molecule concentration, requiring greater energy to be absorbed to initiate cracks [33]. SCB is usually detected and quantified using analytical techniques like solution differential scanning calorimetry (DSC), temperature rising elution fractionation (TREF), and crystallization analysis fractionation (CRYSTAF) [34][35][36][37][38][39].…”

Section: 21mentioning

confidence: 99%

Analytical Rheology of Polymer Melts: State of the Art

Shanbhag

2012

ISRN Materials Science

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The extreme sensitivity of rheology to the microstructure of polymer melts has prompted the development of "analytical rheology," which seeks inferring the structure and composition of an unknown sample based on rheological measurements. Typically, this involves the inversion of a model, which may be mathematical, computational, or completely empirical. Despite the imperfect state of existing models, analytical rheology remains a practically useful enterprise. I review its successes and failures in inferring the molecular weight distribution of linear polymers and the branching content in branched polymers.

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Section: 21mentioning

confidence: 99%

Analytical Rheology of Polymer Melts: State of the Art

Shanbhag

2012

ISRN Materials Science

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“…It is well known that the melting enthalpy (DH m ) of an E/a-olefin copolymer decreases with increasing the content of the comonomer [26], the insertion of the a-olefin reducing both the degree of crystallinity and the melting temperature of the copolymer [27,28]. Randall evidenced that for E/a-olefin copolymers including E/H copolymers the density of the sample decreases with increasing the comonomer content [29,30].…”

Section: Physico-chemical Measurements and Analytical Proceduresmentioning

confidence: 99%

Linear low-density polyethylenes by co-polymerization of ethylene with 1-hexene in the presence of titanium precursors and organoaluminium co-catalysts

Carlini

D’Alessio

Giaiacopi

et al. 2007

Polymer

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“…The Crystaf curves became broader as Sarzotti et al reported previously. 15 Figures 4 to 7 show the difference between TREF and Crystaf curves for the same copolymer sample. All peaks in Crystaf curves were lower than that of TREF curve, resulting from the supercooling effect, similar to what could be observed between the heating and cooling cycles in DSC.…”

Section: Resultsmentioning

confidence: 99%

Chemical compositional distribution of ethylene-1-butene copolymer prepared with heterogeneous ziegler-natta catalyst: TREF and crystaf analysis

Jeon

Yim

et al. 2009

Macromol. Res.

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Ethylene-1-butene copolymers were prepared with SiO 2 -supported TiCl 4 catalyst by changing of 1-butene/ethylene molar ratio in feed, and the resulting copolymers were analyzed using temperature rising elution fractionation (TREF) and crystallization fractionation (Crystaf) methods to investigate the influence of C 4 /C 2 molar ratio in feed on chemical compositional distribution and other parameters such as molecular weight and its distribution. TREF analysis showed that the copolymers had a broad and bimodal chemical compositional distribution (CCD) regardless of the content of 1-butene in the copolymer. The chemical composition was in the range of 5 to 55 branches per 1,000 carbons for all copolymers prepared in the study. Furthermore, the broader CCD was revealed for the copolymers having the higher content of 1-butene. Crystaf analysis did not showed a bimodal CCD for the copolymers having the 1-butene content of less than 5.1 wt%. The lower crystalline part having higher 1-butene content in Crystaf analysis was less than that of TREF analysis.

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Analysis of the chemical composition distribution of ethylene/α-olefin copolymers by solution differential scanning calorimetry: an alternative technique to Crystaf

Cited by 32 publications

References 41 publications

Analytical Rheology of Polymer Melts: State of the Art

Analytical Rheology of Polymer Melts: State of the Art

Linear low-density polyethylenes by co-polymerization of ethylene with 1-hexene in the presence of titanium precursors and organoaluminium co-catalysts

Chemical compositional distribution of ethylene-1-butene copolymer prepared with heterogeneous ziegler-natta catalyst: TREF and crystaf analysis

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