Molecular Dynamics of Polyfarnesene

Ciprian Iacob; Taejun Yoo; James Runt

doi:10.1021/acs.macromol.8b00851

Molecular Dynamics of Polyfarnesene

Ciprian Iacob, Taejun Yoo, James Runt

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26 Scopus citations

Abstract

This paper represents the first comprehensive report of the molecular weight dependence of the dynamics of polyfarnesene (PF), utilizing oscillatory shear rheology and broadband dielectric spectroscopy. Extended PF chain conformations arising from tightly packed C11/C13 pendant groups reduce the probability of chain entanglements and lead to Rouse-like melt dynamics up to a critical molecular weight ∼10⁵ g/mol. At higher molecular weights, PF behaves as an entangled polymer melt. Dielectric spectroscopy measurements establish PF as a type-A polymer, whose normal mode relaxation is strongly dependent on molecular weight, providing a compliment to melt rheology for the exploration of PF global chain dynamics.

Original language	English (US)
Pages (from-to)	4917-4922
Number of pages	6
Journal	Macromolecules
Volume	51
Issue number	13
DOIs	https://doi.org/10.1021/acs.macromol.8b00851
State	Published - Jul 10 2018

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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AB - This paper represents the first comprehensive report of the molecular weight dependence of the dynamics of polyfarnesene (PF), utilizing oscillatory shear rheology and broadband dielectric spectroscopy. Extended PF chain conformations arising from tightly packed C11/C13 pendant groups reduce the probability of chain entanglements and lead to Rouse-like melt dynamics up to a critical molecular weight ∼105 g/mol. At higher molecular weights, PF behaves as an entangled polymer melt. Dielectric spectroscopy measurements establish PF as a type-A polymer, whose normal mode relaxation is strongly dependent on molecular weight, providing a compliment to melt rheology for the exploration of PF global chain dynamics.

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Molecular Dynamics of Polyfarnesene

Abstract

All Science Journal Classification (ASJC) codes

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