Howard Hanson's Autographs in the Sibley Music Library

Watanabe, Ruth

doi:10.2307/891582

Cited by 2 publications

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“…Appearance of broad peak at 2.54 ppm is due to -CH 3 of acetyl moiety. Figure 9(c) shows the NMR spectrum of poly(acetoxystyrene-co-acetylstyrene-costyrene) in CDCl 3 The broad peak at 2.54 is shifted to 2.19, which is due to acetoxy (CH 3 -COO) moiety. The small peak at 2.56 ppm is still present that is due to incomplete oxidation of acetyl groups.…”

Section: Resultsmentioning

confidence: 99%

“…Particularly, device generations will be produced with lithography systems employing shorter wavelengths by using KrF excimer laser light (248 nm), ArF excimer laser light (193 nm), and F 2 excimer laser light (157 nm) to produce patterns of size of 0.3 m or less. 3 Cresol-formaldehyde condensation polymers (ortho novalacs), with diazonaphthoquinone sulfonate esters as sensitizers, are used in photoresist formulations that use 436-, 405-, and 365-nm regions. The condensation polymerization of cresol with formaldehyde is difficult to control and results in a relatively low molecular weight polymer with number-average molecular weight (M n ) around 2500 and with a broad dispersity (20 -40).…”

Section: Introductionmentioning

confidence: 99%

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Facile synthesis of poly(4‐hydroxy styrene) from polystyrene

Deokar

Ghadage

Rajan

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:A facile methodology to modify polystyrene, to incorporate alkali soluble hydroxy groups, is reported. Polystyrene of well-defined number-average molecular weights in the range of 3000 to 50,000 were prepared by suspension polymerization at 80°C by varying the relative mole ratio of carbon tetrachloride, used as chain transfer agent. Polystyrenes were acetylated; the acetyl groups were converted to acetoxy groups, by Baeyer-Villiger oxidation, and hydrolyzed in a nonaqueous alkaline medium to generate hydroxy groups. The extents of modifications were monitored by infrared spectroscopy. The glass transition temperatures of poly(4-acetylstyrene-co-styrene), poly(4-acetylstyrene-co-4-acetoxystyrene-co-styrene), and poly(4-hydroxystyrene-co-4-acetylstyrene-co-styrene) were 107, 134, and 142°C, respectively. The polymers were evaluated in photoresist formulations.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%