Crystallization of photo-chain extended poly(ethylene glycol)

Scott R. Trenor; Timothy E. Long; Brian J. Love

doi:10.1016/j.eurpolymj.2004.09.009

Crystallization of photo-chain extended poly(ethylene glycol)

Scott R. Trenor, Timothy E. Long, Brian J. Love

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Coumarin-functionalized polyethylene glycol) (PEG) monols and diols were isothermally crystallized at temperatures between 20 and 35°C before and after exposure to approximately 110Jcm^-2 of ultra-violet A (λ >300nm, UVA) irradiation. Irradiation dimerized the coumarin groups and chain-extended the coumarin-functionalized PEG oligomers. The higher molecular weights reduced the crystal growth rate by as much as 50% compared to the non-irradiated coumarin-functionalized PEG oligomers under ambient crystallization conditions. Hoffman's kinetic nucleation theory was utilized to evaluate the types of nucleation that occurred for the coumarin-functionalized PEG diols (COU-PEG-COU). Crystallization regimes II and III were observed for the coumarin-modified PEG oligomers before and after exposure to UVA light.

Original language	English (US)
Pages (from-to)	219-224
Number of pages	6
Journal	European Polymer Journal
Volume	41
Issue number	2
DOIs	https://doi.org/10.1016/j.eurpolymj.2004.09.009
State	Published - Feb 2005
Externally published	Yes

Keywords

Coumarin
Crystallization
Photochemistry
Poly(ethylene glycol)

ASJC Scopus subject areas

Physics and Astronomy(all)
Polymers and Plastics
Organic Chemistry
Materials Chemistry

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10.1016/j.eurpolymj.2004.09.009

Cite this

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title = "Crystallization of photo-chain extended poly(ethylene glycol)",

abstract = "Coumarin-functionalized polyethylene glycol) (PEG) monols and diols were isothermally crystallized at temperatures between 20 and 35°C before and after exposure to approximately 110Jcm-2 of ultra-violet A (λ >300nm, UVA) irradiation. Irradiation dimerized the coumarin groups and chain-extended the coumarin-functionalized PEG oligomers. The higher molecular weights reduced the crystal growth rate by as much as 50% compared to the non-irradiated coumarin-functionalized PEG oligomers under ambient crystallization conditions. Hoffman's kinetic nucleation theory was utilized to evaluate the types of nucleation that occurred for the coumarin-functionalized PEG diols (COU-PEG-COU). Crystallization regimes II and III were observed for the coumarin-modified PEG oligomers before and after exposure to UVA light.",

keywords = "Coumarin, Crystallization, Photochemistry, Poly(ethylene glycol)",

author = "Trenor, {Scott R.} and Long, {Timothy E.} and Love, {Brian J.}",

note = "Funding Information: The authors gratefully acknowledge financial support from the Avery Dennison Chemical Company and the Center for Adhesive and Sealant Science (CASS) at Virginia Tech. This material is based upon work supported by, or in part by, the US Army Research Laboratory and the US Army Research Office under grant number DAAD19-02-1-0275 Macromolecular Architecture for Performance (MAP) MURI.",

year = "2005",

month = feb,

doi = "10.1016/j.eurpolymj.2004.09.009",

language = "English (US)",

volume = "41",

pages = "219--224",

journal = "European Polymer Journal",

issn = "0014-3057",

publisher = "Elsevier Limited",

number = "2",

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TY - JOUR

T1 - Crystallization of photo-chain extended poly(ethylene glycol)

AU - Trenor, Scott R.

AU - Long, Timothy E.

AU - Love, Brian J.

N1 - Funding Information: The authors gratefully acknowledge financial support from the Avery Dennison Chemical Company and the Center for Adhesive and Sealant Science (CASS) at Virginia Tech. This material is based upon work supported by, or in part by, the US Army Research Laboratory and the US Army Research Office under grant number DAAD19-02-1-0275 Macromolecular Architecture for Performance (MAP) MURI.

PY - 2005/2

Y1 - 2005/2

N2 - Coumarin-functionalized polyethylene glycol) (PEG) monols and diols were isothermally crystallized at temperatures between 20 and 35°C before and after exposure to approximately 110Jcm-2 of ultra-violet A (λ >300nm, UVA) irradiation. Irradiation dimerized the coumarin groups and chain-extended the coumarin-functionalized PEG oligomers. The higher molecular weights reduced the crystal growth rate by as much as 50% compared to the non-irradiated coumarin-functionalized PEG oligomers under ambient crystallization conditions. Hoffman's kinetic nucleation theory was utilized to evaluate the types of nucleation that occurred for the coumarin-functionalized PEG diols (COU-PEG-COU). Crystallization regimes II and III were observed for the coumarin-modified PEG oligomers before and after exposure to UVA light.

AB - Coumarin-functionalized polyethylene glycol) (PEG) monols and diols were isothermally crystallized at temperatures between 20 and 35°C before and after exposure to approximately 110Jcm-2 of ultra-violet A (λ >300nm, UVA) irradiation. Irradiation dimerized the coumarin groups and chain-extended the coumarin-functionalized PEG oligomers. The higher molecular weights reduced the crystal growth rate by as much as 50% compared to the non-irradiated coumarin-functionalized PEG oligomers under ambient crystallization conditions. Hoffman's kinetic nucleation theory was utilized to evaluate the types of nucleation that occurred for the coumarin-functionalized PEG diols (COU-PEG-COU). Crystallization regimes II and III were observed for the coumarin-modified PEG oligomers before and after exposure to UVA light.

KW - Coumarin

KW - Crystallization

KW - Photochemistry

KW - Poly(ethylene glycol)

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DO - 10.1016/j.eurpolymj.2004.09.009

M3 - Article

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SN - 0014-3057

VL - 41

SP - 219

EP - 224

JO - European Polymer Journal

JF - European Polymer Journal

IS - 2

ER -

Crystallization of photo-chain extended poly(ethylene glycol)

Abstract

Keywords

ASJC Scopus subject areas

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