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A study of photo-oxidized poly(acryl...

University of Toronto (Canada).

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A study of photo-oxidized poly(acrylic acid) luminescence.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A study of photo-oxidized poly(acrylic acid) luminescence./
作者:	Graham, Rob R.
面頁冊數:	93 p.
附註:	Source: Masters Abstracts International, Volume: 47-04, page: 2203.
Contained By:	Masters Abstracts International47-04.
標題:	Chemistry, Physical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=MR44918
ISBN:	9780494449189

A study of photo-oxidized poly(acrylic acid) luminescence.
Graham, Rob R.

A study of photo-oxidized poly(acrylic acid) luminescence. - 93 p.

Source: Masters Abstracts International, Volume: 47-04, page: 2203.

Thesis (M.Sc.)--University of Toronto (Canada), 2008.

When irradiated with ultraviolet light at 254 mn, poly(acrylic acid) (PAA) became luminescent. It is thought that this luminescence comes from main chain carbonyl groups that appear during photo-oxidation [94]. Three molecular weights of PAA were irradiated: 2,000 M¯w (2K), 100,000 M¯w (100K), and 1,000,000 M¯w (1Mil). 2K PAA showed peak fluorescence at 410 nm, while 100K and 1Mil PAA both showed peaks at 435 nm and 495 nm. UV-Visible spectroscopy showed 3 transitions increase in intensity during irradiation. The transition at 275 nm was assigned as the n → pi* of main chain carbonyl groups. The fluorescence seen was not attributable to this transition because the peaks in the excitation spectrum are lower energy. Fluorescence lifetimes were measured as 2.7 ns, 4.6 ns and 4.9 ns, respectively; using time correlated single photon counting. The photo-oxidized polymer deposited in multilayer films when deposition pH was 4, verified by atomic force microscopy.

ISBN: 9780494449189Subjects--Topical Terms:

560527
Chemistry, Physical.

A study of photo-oxidized poly(acrylic acid) luminescence.
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520 $a When irradiated with ultraviolet light at 254 mn, poly(acrylic acid) (PAA) became luminescent. It is thought that this luminescence comes from main chain carbonyl groups that appear during photo-oxidation [94]. Three molecular weights of PAA were irradiated: 2,000 M¯w (2K), 100,000 M¯w (100K), and 1,000,000 M¯w (1Mil). 2K PAA showed peak fluorescence at 410 nm, while 100K and 1Mil PAA both showed peaks at 435 nm and 495 nm. UV-Visible spectroscopy showed 3 transitions increase in intensity during irradiation. The transition at 275 nm was assigned as the n → pi* of main chain carbonyl groups. The fluorescence seen was not attributable to this transition because the peaks in the excitation spectrum are lower energy. Fluorescence lifetimes were measured as 2.7 ns, 4.6 ns and 4.9 ns, respectively; using time correlated single photon counting. The photo-oxidized polymer deposited in multilayer films when deposition pH was 4, verified by atomic force microscopy.
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